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HomeMy WebLinkAboutPlans & Specifications ,"' '. .... '--'""""'11 "....,;.a.r~.,:- STORMWATER CALCULATIONS Five Hawks Avenue Drainage Basin & Outlet Ch9nnel PRIOR LAKE, MINNESOTA Jan 28, 1994 Prepared by: ~~. .. VALLEY ENGINEERING CO., INC. <;J ~ 7301 OHMS LANE, SUITE 500 MINNEAPOLIS, MN 55439 (612) 832-9475 .. r STORMWATER CALCULATIONS Five Hawks Avenue Drainage Basin & Outlet Channel PRIOR LAKE, MINNESOTA Jan 28, 1994 Prepared by: ~~~ VALLEY ENGINEERING CO., INC. <;J ~ 7301 OHMS LANE, SUITE 500 - MINNEAPOLIS, MN 55439 (612) 832-9475 Date //()~1~ _.........___~~". ........,... ,"'~_... ....,'".~_,_,... 'h,-'__ _._.~_,~,~~._.~..""..__.....,__.~...,~__._~..... ,. - II TABLE OF CONTENTS TITLE PAGE CERTIFICATION PAGE PART I - INTRODUCTION PART II - PRESENT CONDITIONS PART III - FULLY DEVELOPED CONDITIONS PART IV CONCLUSIONS AND RECOMMENDATIONS DATA (APPENDIX) i-~//;~/)/I~,~~,{j~~~' .,~jI;.~r~ ~ "J~' .-,fA tp_ ..... ''',41/ .,r.~ ~'-I ,. ~" I v/ . 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'r -......- ....~- '~ · .. ''-..L./ ..' k'" ------- - ,.----;:;'t~ ~:::: "" ", .,_./ ...,....~--r-- -,-- -' _. ....;. "./ /1 ./ t _._.~~ ,/ / /~.. ;YG"'~ . -..---....-..- ' ~ ~ .I / ~._........._ . . .......-"'> II ," / I I /~ .-"'. .... ./ / // ~-.~~'" ..~---- I( ...._~ .....'~ 'l ..,~-" ~ _ / . ~~. ~-- r', ,,~ /~ ..' " . /' / ,-- .,_;;;,.. , //'. / /..1 . (".~ /~. ~ .. ,// '/ ,,,/' ,. ",/ ........-. . .- . .../ / .I., !rZ ... , ,/",/ // /// / .' ,-~/ ' "...' "or / .--.,.-- 1 ~/. ,/" / ,...... .~- ~ PART I - INTRODUCTION:, This report analyses the hydrology from the 31 acre Five Hawks Avenue drainage area as an adjunct to the hydrologic analysis and improvements underway in the 150 acre area that lies upstream. The total 181 acre drainage basin includes a mixture of single family residential, multi-family residential, commercial, school, open space and park uses. Current construction of 97 new single family houses in the plat of Westbury Ponds and 32 new multi-family units in West Edge Estates has prompted management of the physiology of the basin to provide for major treatment and storage of storm water runoff. A small channel located below Five Hawks School collects the drainage from the entire basin and conveys it to the stream that flows parallel to Cates Street a short distance above Prior Lake. It is the intent of this analysis to evaluate the Five Hawks drainage basin and outlet channel for the purpose of preliminary design for the construction a small dam and outlet structure. The drainage basin evaluated for the 6",24 hour, one hundred year recurring storm of 24 hour duration for the present and future, fully developed conditions. The one hundred year storm defines the needs for ponding and emergency overflows. In order to present the combination of scenarios described in the preceding paragraphs, the body of this report is divided into two parts. Part II describes the present conditions. The term "present" in this case implies that work in the two new plats will have been done as planned. Part III evaluates the basin in terms of future restrictions and improvements for full development. Future restrictions include diversion of 2.95 acres in the upper part of the basin to Sunset Hills and maintenance of pre-development stormwater flows in other areas. Future improvements include construction of a small dam and control structure at the outlet of the DNR protected wetland 183W. Part II begins with an analysis of the present drainage basin encompassing the new plats according to methods found in the familiar SCS TR-55 (2nd addition). Curve numbers and discharges are determined for sub-areas within the drainage basin for the design storm. Next, the discharges are routed through the present system of ponds and channels in accordance with microcomputer programs entitled "Watershed Modelling and Water Surface Profiles" by Eagle Point (formerly Engineering Data Systems). These programs compute runoff hydrographs for overland flows and route these hydrographs through the storm drainage system and ponding areas under evaluation. The SCS 24 hour distribution for a Type II storm is used. Rating Curves for the outlet structures are developed in accordance with the U.S. Department of Transportation, "Hydraulics of Highway Culverts, Hydraulic Design Series No.5", and the U.S. Department of Transportation, " Hydrology, Hydraulic Engineering Circular No. 19." ' 1 ~'___'~'__M__"._"'____"'."_____~'_'~'------.'--"-~~-"';-'''.''".",""",~-"",,--------'.-'--------' ,.".. PART II - PRESENT CONDITIONS 2.1 GENERAL: The drainage basin under consideration lies within the Upper Prior District as defined in the Prior Lake-Spring Lake Stormwater Management Plan. Sub-areas 47 and 59 through 65 representing 180.8 acres are included. The unique feature of this drainage basin is the linear wetland system that runs through it. Due to on-going suburban development, sub-district drainage divides as laid out in the management plan no longer represent the lay of the land. A more representative picture of the present day drainage areas is shown in Figure 1- Overall Area Plan, Existing Conditions with Plat Overlay. The new plats of Westbury Ponds and West Edge Estates, Five Hawks elementary school, Prior View Townhome developments, the Evangelical Lutheran Church, a large part of the Willows subdivisions and a significant area south of 170th Street all flow into the same drainage system. These sub-areas are defined by Capital Letters A through L. Nomenclature for ponding areas is taken from the MPCA Manual for "Protecting Water Quality in Urban Areas." Outleted ponds that occur in normally dry depressions are called "Detention Basins." Those that have a normal pool of permanent water are called "Detention Ponds." 2.2 SOILS: Soils are classified according to the "Scott County Soil Survey" published by the U.S.D.A. Soil Conservation Service. A listing of the soils within the site along with the hydrologic grouping is shown in Table 2 - 1. TABLE 2 - 1 SOILS CLASSIFICATIONS SYMBOL DESCRIPTION HaB HaC HaD HaC2 HaD2 HaE2 HbC HbE2 EaA EaB LaD2 LbC2 PbA TbB Wb Hayden loam, 0 to 6 percent slopes Hayden loam, 6 to 12 percent slopes Hayden loam, 12 to 18 percent slopes Hayden loam, 6 to 12 percent slopes, moderately eroded. Hayden loam, 12 to 18 percent slopes, moderately eroded. Hayden loam, 18 to 25 percent slopes, slightly and moderately eroded. Hayden sandy loam, 6 to 12 percent slopes Hayden sandy loam, 18 to 25 percent slopes, slightly and moderately eroded. Esthervile loam and sandy loam, 0 to 2 percent slopes Esthervile loam and sandy loam, 2 to 6 percent slopes Lakeville loam, 12 to 18 percent slopes, moderately eroded. Lakeville-Burnsville gravelly sandy loams, 6 to 12 percent slopes, moderately eroded. Peat and muck, shallow, 0 to 2 ~ercent slopes Terril sandy loam, 0 to 6 percenr slopes Webster-Glencoe silty clay loams HYDROLOGIC GROUP B B B B B B B B B B B B D B D ...-w-.-...-----....,....,....".,-~~-----..~-.,.-~~- Topsoils as shown in the Soil Survey have been stripped from the roadbeds and building pads and respread on the final graded surfaces. It is anticipated as such that all of the topsoil will conform to Hydrologic Group "B" for usage in the SCS methodology. 2.3 LAND USE AREAS AND HYDROLOGIC CURVE NUMBERS: , Weighted curve numbers which consider land use, soil classification and infiltration are determined according to the TR-55 Computation Sheets included in the Appendix. Curve number indices for each subarea are summarized as follows in Table 2 - 2. TABLE 2 - 2 HYDROLOGIC CURVE NUMBERS, EXISTING CONDITIONS -' SUB-AREA LAND USES AREA CURVE in acres NUMBER A Agricultural, row crops and state highway 4.10 78 B Business, car wash and cabinet shop 5.48 70 C Agricultural, row crops 2.95 82 0 Agricultural, row crops and single family residential 11.45 79 E Single family and multifamily residential 4.11 76 F Single family and multifamily residential 26.41 75 G Single family residential 12.86 75 H Single family residential and wetland 1.86 80 I Single family residential 39.50 72 J Single family residential and wetland 15.23 71 K School, park and wetland 26.25 72 -- 4 -_..-.,-_.,-~>.~.,..,_......__._.,-..-___~_,_~....,.....^ _____.'__<N'.__..<_..,. _ "-~,."... .,.....~_....~",-~ .". - ......--""......._..._.._--..-,.--"'~'...............~_.......~ 2.4 PONDING & DISCHARGES: Several ponding areas occur within the drainage basin. In sub-areas 1 and 2, significant stormwater detention basins are created by culvert headwaters. Stage, storage and discharge are calculated according to the worksheets in the Appendix. The results are summarized in Table 2-4. TABLE 2 - 4 STORMWATER PONDING AREAS, PRESENT CONDITIONS ROUTED FLOWS SUB- WATER SURFACE ELEVATION DISCHARGE AREA FEET CFS A (1) 970.58 5.23 B (2) 966.13 11.49 E 958.72 19.91 F 931.53 52.99 G 930.85 41.22 H 928.87 98.54 J (3) 923.53 45.68 L 915.98 140.69 ",,-~, (1 ) Estimated culvert inlet elevation = 968.9 (2) Estimated culvert inlet elevation = 963.0 (3) Estimated spillway elevation = 921.3 2.5 OUTLET CHANNEL FLOW PROFILE: A water surface profile for the routed discharge from the entire basin is calculated according to the worksheets in the appendix from field measurements made on December 10, 1993. From Table 2-4, the predicted 100 year flow is equal to 140.69 cfs. This flow will be 2.4 to 2.8 feet deep, flowing at 4.2 to 6.4 feet per second in the channel. Flows in this range are considered to be erosive. 5 , 0 ..., .---- -,._, ,. .-'-"'l'r_o. '_--y---_.,. I I 1 1 I 1 1 HYDRO GRAPH 100 YEAR 160 ,-..,. 140 00 ...... (J '-J 120 ~ (j 100 ~ 0'1 ( tt: 80 U tI) 60 ...... Q 40 20 PRESENT CONDITIONS ROUTED OUTFLOW FROM FIVE HAWKS AVE. WETLAND PEAK DISCHARGE = 140.69 CFS 0, o I 1000 1500 ".. I 2000 I 2500 I 3000 3500 '~ 1 1..-/ 500 'lIME (min) TABLE 3 - 4 STORMWA TER PONDING AREAS, FULL Y DEVELOPED CONDITIONS ROUTED FLOWS SUB- WATER SURFACE ELEVATION DISCHARGE AREA FEET CFS A (1) 970.58 5.23 B (2) 966.24 56.50 E 961.85(3) 62.09 F 931.81 101.29 G 930.85 41.22 ,! H 929.02 144.41 J (3) 924.80 13.41 L 920.71 (5) 13.38 (1) Estimated culvert inlet elevation = 968.9 (2) Estimated culvert inlet elevation = 963.0 (3) Lowest floor walkout elevation adjacent to pond was measured at 16981 Willow Lane. Floor elevation = 963.3 (4) Estimated preliminary design principal spillway elevation = 921.5. ONHWelevation has been set at 923.0~ A permit from the DNR is needed to effect the design. (5) Lowest floor walkout elevation adjacent to pond was measured at 16595 Dutch Ave. Floor elevation = 923.66 PART IV - CONCLUSIONS AND RECOMMENDATIONS: Because of the linear nature or the stormwater detention ponds, the upstream peak flows from Areas A through J while significantly large, are attenuated as they move down through the system. These flows can be throttled even more by construction of a dam and control structure at the location of the present spillway from Wetland 183W. In keeping with previous recommendations the total 100 year flow at this location can be restricted to 13.41 cfs as shown in the data. The resultant design high water elevation equal to 924.80 will likely impact adjacent properties so that drainage easements or land filling above elevation 923.0 may be needed to implement the design. Such deliberations seem feasible, but are not included in the scope of this report. The scenario is evaluated only for the purpose of substantiating the design of the Five Hawks Channel outlet structure further downstream. Design and construction of an outlet control dam and structure in the Five Hawks channel is affected to a greater degree by the shorter times of concentration and more rapid stormwater runoff release from the Areas K and L which include a total of 56.88 acres that flow directly to the present outlet channel. While the future regulated flow from Wetland 183W will be long and sustained, the flow generated from Areas K and L will be high and will peak early. In combination these two inflows will produce a double peak hydrograph. Previous studies ..have suggested that the flow in the outlet channel be restricted to 5 cfs. According to the current analysis, a flow of 5 cfs will require a 100 year high water level emergency spillway elevation ,equal to 921.37. The lower level walkout floor elevation of the home at 16595 Dutch Avenue was measured at elevation 923.66 - only 2.29 ft. higher. It is recommended that the vertical separation be at least 3 feet instead. With the spillway set at 920.66 a 12" diameter pipe outlet will provide a headwater elevation of 920.71, but at a peak rate equal to 13.4 cfs. The flow in the channel at 13.4 cfs will be 0.62 to 0.73 feet deep. Velocities will range from 2.6 to 4.0 feet per second. 4.0 feet per second is considered to be the upper limit for erosion potential, therefore the 13.4 discharge rate is satisfactory. Considering that this rate is less tan 10% of the peak inflow rate, it is a feasible alternative to the previously suggested 5 cfs, since it allows the 3 feet of separation. Consequently, it is recommended that 100 year discharge rate from the outlet be limited to no more than 13.4 cfs. The outlet should be place at a distance of 133 feet above the confluence with the Cates Street stream. In accordance with the recommended discharge rate, the emergency spillway elevation will be 920.66. the height of the dam will be 7.86 feet above the channel bottom. The length of the dam would be 140 feet allowing for 2 feet of freeboard above the emergency spillway. -. ........- .....--_....--..,.-...~-------.. ._---~-,- 300 ,...... ~ 250 U "-J ~ tJ 200 ..... ~ 0 ( ::r: 150 U tI) I-l 100 Q 50 ~ ." 00 HYDRO GRAPH FUTURE CONDITIONS 100 YEAR INFLOW/OUTFLOW - WETLAND 183W ~ PEAK DISCHARGE = 13.41 CFS jf i~--+--I I I 1000 2000 3000 4000 5000 I 6000 TIME (min) I 7000 , 8000 ~ ~ 160 ,-... 140 00 "..... U 'I.J 120 ~ 0 100 ~ ~ 80 ::t U tI) 60 ~ Q 40 20 0/ 0 ="~ J HYUROGRAPH FUTURE CONDITIONS 100 YEAR INFLOW/OUTFLOW - FIVE HAWKS AVE. WETLAND EMERGENCY SPILLWAY AT ELEVATION 921.37 PEAK DISCHARGE = 4.71 CFS ): 1000 I __ I ---- 2000 3000 4000 5000 6000 'lIME (min) , - 7000 .... l\J 160 ""'" 140 00 "..... (J -...; 120 ~ (j 100 ~ < 80 :r: U U) 60 t---ol Q 40 20 0- 0 r ! fl ! HYDRO GRAPH FUTURE CONDITIONS 100 YEAR INFLOW/OUTFLOW - FIVE HAWKS AVE. WETLAND EMERGENCY SPILLWAY AT ELEVATION 920.66 PEAK DISCHARGE = 13.38 CFS 1- 500 I 3000 i _______ I 3500 4000 I 2500 1000 1500 2000 'lIME (min) I 4500 DATA -" -~_..__._.._~,._""~,_"...~_.,..~._...~,_~.._....,,_."........._.__..___....4_____._'.~..~-..-.~.............._~.---_-,,-,_,_.___._,...~ ...._ 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 1 COMPUTED FLOOO : Area A, Present - 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Ti_ to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph t......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Tillie to Peak.............................. = TilDe of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NUJII:)er.............................. = Page 1 11.61 (efs) 1.22 (aeft) 5 (mi n) 735.00 (min) 1505.00 (min) 1.00 1 CURVILINEAR UH 8.24 (cfs) 484.00 5 (min) 22.59 (min) 112.93 (min) 1.00 (in) 20.33 (min) 4.10 (ac) 78 Appendix - 1 _... -- ...~..~~"~-'-"..-*.........--~"... -~'- 1129194 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 1 COMPUTED FLOOD : Area A, Present ~ 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (S).... ........................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Lertgth (L)........................... = Trevel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = ChafVleL Slope (5)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] DfstribJtfon Type......................... = Total Precipitation....................... = Return Period............................. = Stonm Duration............................ = Page 2 0.24000 133.00 eft) 2.80 (In) 0.01300 22.n (mln) 1.50000 0.00250 0.75 (ft/s) 500.00 (ft) 11. 11 (ml n) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 33.88 (mln) SCS II 6.00 (In) 100 (yr) 24.00 (hr) Appendix - 2 ,. .'"..---' -,-"-,ro- .-... IT 1129/94 RESERVOIR REPORT RECORD NlJI4BER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 1 : MAN STAGE/STOR COMP STAGE/DISC N.W. Quadrant 170th St. & STH 13 [RATING CURVE LIMIT] MinillLlll Elevation......................... = Maximum Elev.tion......................... = Elevation Increment....................... = [STAGE STORAGE INFORMATION] Input file = NULL OUtput file = NULL [Manual Storage vs. Elevation] ---------------------------------------.-------- ELEVATION eft) STORAGE ecf) ------------------------------------------------ 970.00 9n.OO 24n.00 39827.00 [STAGE DISCHARGE INFORMATION] Page 1 968.90 eft) 9n.oo eft) 0.20 eft) OUTLET STRUCTURE: STR , 1 TYPE CIRCULAR CORRIGATED METAL PIPE w/ mitered to slope DESCRIPTION 18" CMP Culvert at 170th St. Appendix - 3 ,'" ,,--.. ._._-,..._,...--..,,~_.~--"~_.~."" 1129/94 HYDROGRAPH REPORT RECORD NlJIIBER TYPE DESCRIPTION 2 RESER STOR. I ND 100 yr. discharge from Area A [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Ti. Interval............................. = Time to Peak.............................. . Time of Base.............................. = Peak Elevation............................ = [INFLOW HYDROGRAPH INFORMATION] Page 1 5.23 (cfs) 1.20 (aeft) 5 (mi n) 755.00 (min) 1540.00 (min) 970.58 (ft) Hydrograph tI.............................. = Hydrograph Description.................... = Area A, Present - 100 yr. Appendix - 4 --'-..--....,.---w----......~_____~-,...._-"--- 1129/94 HYDROGRAPH REPORT RECORD NUMBER : 3 TYPE : COMPUTED FLOOD DESCRIPTION : Area B, Present 100 yr. [HYDROGRAPH INFORMATION) Peak Disch.rge............................ = Volume.................................... = TilDe Interval............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Ti. Interval............................. = Tille to Peak.............................. = TilDe of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve N\llt)er.............................. = Page 1 14.56 (cfs) 1.28 (acft) 5 (mi n) n5.00 (min) 1490.00 (min) 1.00 2 CURVILINEAR UH 15.03 (cfs) 484.00 5 (min) 16.55 (min) 82.74 (min) 1.00 (in) 14.89 (m;n) 5.48 (ac) 70 Appendix - 5 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 3 COMPUTED FLOOO : Area B, Present 100 yr. [TIME CONCENTRATION -. TR-55] SHEET FLOW Manning'S Roughness COIf. (n)............. = Flow Lertgth (l)........................... = 2-yr 24-hr Rainfall (R)................. = Lend Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Ch8l'Ylel SLope- (5)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipit8tion....................... = Return Period............................. = Stonm Duration............................ = Page 2 0.24000 120.00 (ft) 2.80 (in) 0.02000 17.65 (min) 1. 50000 0.00700 1.25 (ft/s) 540.00 (ft) 7.17 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 24.82 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 6 ___~,_..____...,""_,__.__~--..._... _ . ..._.__~,o>__.._~.,_."'__.....___.~_........-. 1129/94 HYDROGRAPH REPORT RECORD UBER TYPE DESCRIPTION : 4 : COMPUTED FLOOD : Area C. Present 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Vol1.llle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = Time Interval............................. = Ti_ to Peak.............................. = Time of B.se.............................. = Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Ti_ Interval............................. = Time to Peak.............................. = Time of B8se.............................. = Rainfall Excess........................... = Bas i n Leg T i IRe. . . . . . . . . . . . . . . . . . . . . . . . . . . . = [BASIN DESCRIPTION] Watershed Area............................ = Curve Nl.Illber.............................. = Page 1 6.47 (efs) 0.98 (aeft) 5 (min) 750.00 (min) 1520.00 (min) 1.00 3 TRIANGULAR UH 3.66 (efs) 484 . 00 5 (mi n) 36.61 (min) 97.63 (min) 1.00 (in) 32.95 (min) 2.95 (ae) 82 Appendix - 7 "__ .,_c_.~---...<..... _...".__".~..._..~ . ~._.~.._,....,._.~'___."'.......,_...""..~ 1129/94 HYDROGRAPH REPORT RECORD NlJtBER TYPE DESCRIPTION 4 COMPUTED FLOOD : Area C, Present 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow Length (L)........................... . 2-yr 24-hr a.ln18l1 (R)................. = Land Slope (S)............................ . Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Chal'Y'tel SLope (5)......................... = Manning's Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow- Length (L)........................... = TraveL Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... . [RAINFALL DESCRIPTION] DistribJtiOl1 Type......................... = Total Precipitation....................... = Return Period............................. · Stonm Duration............................ = Page 2 0.17000 300.00 (ft) 2.80 (in) 0.02200 26.84 (min) 1.50000 0.00500 1.06 (ft/s) 230.00 (ft) 3.61 (min) 0.70 (ft) 0.01500 0.24000 0.60 (ft/s) 880.00 (ft) 24.47 (min) 54.92 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 8 ". .._.~-"-'"..~'_.~'----~.."-........,,.....-----~.~.._'_.._._-_..~--~._-_..,..----.-,... 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 5 COtPUTEO FLOOO : Area 0, Present 100 yr. [HYOROGRAPH INFORMATION] Peak Discharge............................ = Volune.................................... = Time Interv.l............................. = Time to P..k.............................. = TilDe of Base.............................. = Multiplication factor..................... = PJNIT HYDROGRAPH INFORMATION] Unit hydrograph ,......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak........ ...................... = Time of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Ares............................ = Curve N~r.............................. = Page 1 32.43 (ds) 3.51 (acft) 5 (min) 735.00 (min) 1525.00 (min) 1.00 4 CURVI LI NEAR UH 21.83 (ds) 484 . 00 5 (mi n) 23.80 (min) 119.02 (min) 1.00 (in) 21.42 (min) 11.45 (ac) 79 Appendix - 9 . --. ."._.---..".~-~-~-'--""'~---.....----.._.____.____"',._..'"~..~._..._~.___.w_.,____ 1129/94 HYDROGRAPH REPORT RECORD NlItBER TYPE DESCRIPTION 5 COMPUTED FlOOO : Area D, Present 100 yr. [TIME CONCENTRATION -. TR-55] SHEET FLOW Menning'S Roughness Coef. (n)............. = Flow length (l)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope ($)............................ = TreveL Time of Sheet Flow................. = SHALLOW FLOW K_coef (surface description) (K).......... = Watercourse Slope (S)..................... = Veloc..;ty (V)... ........................... = Flow length eL)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Channel Slope ($)......................... = Manning'S Roughness Ceef. (n)............. = Channel Velocity (V)...................... = Flow Length eL)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] DfstribJtiOl1 Ty-pe-......................... = Total Precipitation....................... = Return Period............................. = StOMm Duration............................ = Page 2 0.17000 300.00 (ft) 2.80 (in) 0.01800 29.08 (min) 1.50000 0.01800 2.01 (ft/s) 800.00 (ft) 6.63 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 35.71 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 10 n II 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER : 6 TYPE COMBINE DESCRIPTION : Combined dr.inage .reas upstream of 170th St. [HYDROGRAPH INFORMATION] Peek DJsch.rge............................ = Volune.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. K [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 2 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. discharge from Area A Peak Discharge........................ . Time to Peak.......................... = Time Interval......................... . HYDROGRAPH # 3 TYPE: COMPUTED FLOOD DESCRIPTION : Are. B, Present 100 yr. Peek Discharge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH # 4 TYPE: COMPUTED FLOOD DESCRIPTION : Area C, Present 100 yr. Peak Discharge......................... = Time to Peak.......................... K Time Interv.l......................... = HYDROGRAPH # 5 TYPE: COMPUTED FLOOD DESCRIPTION : Area D, Present 100 yr. Peak Disch.rge........................ = Time to Peak.......................... = Time Interval......................... = 54.46 (cfs) 6.98 (acft) 5 (mi n) 730.00 (min) 1540.00 (m;n) 5.23 (cfs) 755.00 (m;n) 5 (m; n) 14.56 (cfs) 725.00 (m;n) 5 (m; n) 6.47 (cfs) 750.00 (m;n) 5 (mi n) 32.43 (cfs) 735.00 (m;n) 5 (m;n) Appendix - 11 -.'.------w-'.~_--- 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER : 2 STORAGE TYPE : MAN STAGEISTOR DISCHARGE TYPE : COMP STAGE/DISC DESCRIPTION : Pond ; Car Wash/Cabinet Shop [RATING CURVE LIMIT] Minillllll Elevation......................... .. Maxi..... Elev.tfOll......................... = Elevation Increment....................... .. 963.00 eft) 967.20 eft) 0.20 eft) [STAGE STORAGE INFORMATION] Input file.. NULL Output file" NULL ~anual Storage vs. Elevation] ELEVATION (ft) STORAGE (cf) 964 . 00 966.00 967.00 967.20 12090.00 126170.00 183000.00 201000.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR , 2 TYPE : CIRCULAR CORRIGATED METAL PIPE w/ mitered to slope DESCRIPTION: 18" CMP Culvert under 170th St. 800 ft west of STH 13 Appendix - 12 '<-"1l' 1129/94 Page 1 HYDROGRAPH REPORT RECORD NLtlBER TYPE DESCRIPTION 7 RESER STOR. IND : 100 yr. discharge from 170th St. Culvert [HYDROGRAPH INFORMATION] Peak Dfscharge............................ = 11.49 (cfs) 6.98 (aeft) 5 (min) 805.00 (min) 3755.00 (min) 966.13 (ft) Volune. ... . .... ...... .. .. . . ....... . . . . . .. . = Time Interval............................. = Time to Pe.k.............................. = Time of B.se.............................. = Peak Elevation............................ = [INFLOW HYDROGRAPH INFORMATION] Hydrograph ,.............................. = 6 Hydrogr.ph Description.................... = Combined drainage areas upstream of 170th St. .......l Appendix - 13 '".,~.~-'"_............_~.~'--~..._.".."."~____..___...,~_"..m~ 1/29/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 8 COMPUTED FLOOD : Area E, Present 100 yr. [HYDROGRAPH INFORMATION] Peak Dfscharge............................ = Volume.................................... = Time Interval............................. c Time to Peak.............................. = Time of 8ase.............................. = Multiplication factor..................... = ~IT HYDROGRAPH INFORMATION] Uni t hydrograph I......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. = TilDe of B.se.............................. = Rainfall Excess........................... = Basin Lag TilDe............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NlJIt)er.............................. = Page 1 14.97 (cfs) 1.16 (acft) 3 (min) 726.00 (min) 1482.00 (min) 1.00 5 CURVILINEAR UH 13.27 (cfs) 484.00 3 (min) 14.05 (min) 70.27 (min) 1.00 (in) 12.65 (min) 4.11 (ac) 76 Appendix - 14 .-.,...""'"."'----._-"-".......~...-..~-........--- 1129/94 HYDROGRAPH REPORT RECORD NlJ4BER TYPE DESCRIPTION 8 : COMPUTED FLOOO : Area E, Present 100 yr. [TIME CONCENTRATION .- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. · Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. · Land Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of ShaLlow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Channel Slope (S)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Ler.gth (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = StOnl Duration............................ = Page 2 0.24000 180.00 (ft) 2.80 (in) 0.04300 17.98 (min) 1.50000 0.00800 1.34 (ft/s) 250.00 (ft) 3.11 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 21.08 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 15 If 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER : 9 TYPE COMBINE DESCRIPTION : CClIIlbined Areas A_E. Flow to 36" RCP [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... . Time Interv.l............................. = Time to Peak.............................. = Time of Bese.............................. = [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 7 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. discharge from 170th St. Peak Discharge........................ = Time to Peak.......................... · Time Interval......................... = HYDROGRAPH # 8 TYPE: COMPUTED FLOOD DESCRIPTION : Area E. Present 100 yr. Peak Discharge........................ = Time to Pe.k.......................... = Ti. Interval......................... = 20.03 (cfs) 8.13 (acft) 5 (min) 725.00 (min) 3755.00 (min) Culvert 11.49 (cfs) 805.00 (min) 5 (min) 14.97 (cfs) 726.00 (min) 3 (min) Appendix - 16 .,-----,,- -- " . 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 3 : MAN STAGE/AREA : COMP STAGE/DISC : Ditch north of 170th St. [RATING CURVE LIMIT] Minimum Elevation......................... = Maximum Elevation......................... = Elevation Increment....................... = 956.67 eft) 963.00 eft) 0.20 eft) [STAGE STORAGE INFORMATION] Input file = NULL Output file = NULL [Manual Contour Area vs. Elevation] ELEVATION eft) CONTOUR AREA esqft) 958.00 960.00 962.00 963.00 10.00 852.00 8564.00 10927.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR , 4 TYPE : CIRCULAR CONCRETE w/ square edge w/ headwall DESCRIPTION : 36" RCP At SW corner of Westbury Ponds plat Appendix - 17 ... "~~"-----_.w._'--~.~~--w--.-----.,..-.-__ 1129/94 Page 1 HYDROGRAPH REPORT RECORD NlJIBER TYPE DESCRIPTION 10 RESER STOR. I NO 100 yr flow from Areas A-E [HYDROGRAPH INFORMATION] Peak Discharge............................ = 19.91 (cfs) 8.13 (aeft) 5 (mi n) 725.00 (min) 3760.00 (min) 958.72 (ft) Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Peek Elevation............................ = [INFLOW HYOROGRAPH INFORMATION] Hydrograph #.............................. = 9 Hydrograph Description.................... = Combined Areas A_E, Flow to 36" RCP Appendix - 18 >----'-""'" .-... -........---w-----...............--- 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 11 COMPUTED FLOOO : Area F, Single family residential w/storm sewer 100 yr [HYDROGRAPH I N FORMATION] Peak Discharge............................ = Volune.................................... "' Time Interval............................. "' Time to Peak.............................. "' Time of Base.............................. "' Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Uni t hyclrograr:>>h I......................... = Unit hydrograph type...................... "' Peak Discharge............................ "' Shape Factor.............................. = Ti.. IntervaL............................. = Time to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Leg Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = 13.80 (cfs) 4.36 (aeft) 3 (min) 720.00 (min) 1470.00 (min) 1.00 6 CURVILINEAR UH 87.95 (cfs) 484 .00 3 (mi n) 13.63 (min) 68.13 (min) 1.00 (in) 12.26 (min) 26.41 (ac) 75 Appendix - 19 ^..,__........"._...,__................_h__.______~.~----.._-..._,... 1129/94 HYDROGRAPH REPORT RECORD NlJ48ER TYPE DESCRIPTION Page 2 11 COMPUTED FlOOO : Area F, Single femily residential w/storm sewer 100 yr [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow length (l)........................... = 2-yr 24-hr Rainfall (R)................. = Lef'lCt Slope (5)............................ = Travel Time of Sheet Flow................. = SHAllOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (S)..................... = Velocity (V).............................. = Flow length (l)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydreulic Radius (R)...................... = Channel Slope (S)......................... = Menning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = FLow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFAll DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = Stonm Duration............................ = 0.24000 100.00 eft) 2.80 (in) 0.02000 15.26 (min) 1.50000 0.01000 1.50 (ft/s) 300.00 (ft) 3.33 (min) 0.75 (ft) 0.02500 0.01300 14.96 (ft/s) 1660.00 (ft) 1.85 (min) 20.44 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 20 _... . .-'..'----w--......",..- 1129/94 Page 1 HYDROGRAPH REPORT RECORD ......BER TYPE DESCRIPTION 12 COMBINE : Areas A-F, 100 yr. inflow to pond [HYDROGRAPH INFORMATION] Peak Discharge............................ = 90.37 (cfs) 12.50 (aeft) 5 (mi n) no.oo (min) 3760.00 (min) Volune.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = [COMBINE HYDROGRAPH RECORD ,] HYDROGRAPH' 10 TYPE: RESER STOR. IND DESCRIPTION 100 yr flow from Areas A-E Peak Discharge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH' 11 TYPE: COMPUTED FLOOD DESCRIPTION : Area F, Single family residential Peak Discharge........................ Time to Peak.......................... . 19.91 (c:fs) n5.00 (min) 5 (min) Time Interval......................... = w/storm sewer 100 yr 73.80 (cfs) no.oo (min) 3 (min) Appendix - 21 .'-.....-....-'.....-w-- ..____-. 1129/94 HYDROGRAPH REPORT RECORD NlJUIER TYPE DESCRIPTION 13 RESER STOR. IND 100 yr. Flow a Maintenance Drive [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Tille of Base.............................. = Peak Elevation............................ = [INFLOW HYDROGRAPH INFORMATION] Page 1 52.99 (ds) 11.62 (acft) 5 (min) 730.00 (min) 3750.00 (min) 931.53 (ft) Hydrograph t.............................. = 12 Hydrograph Description.................... = Areas A-F, 100 yr. inflow to pond Appendix - 22 n II 11'29/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 14 COMPUTED FLOOD : Area G, Single Family Residential w/storm sewers, 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Ti_ to P.ak.............................. = Time of Base.............................. = Multiplication f.ctor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrogreph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. = Time of 88se.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = 43.43 (efs) 3.50 (aeft) 5 (mi n) n5.00 (min) 1495.00 (min) 1.00 7 CURVILINEAR UH 38.93 (efs) 484 . 00 5 (mi n) 14.94 (min) 74.71 (min) 1.00 (in) 13.45 (min) 12.82 (ae) 75 Appendix - 23 ,. '..'1'r' II 1129/94 HYDROGRAPH REPORT Page 2 RECORD NlI4BER TYPE DESCRIPTION 14 C04PUTED FLOOO : Area G, Single Family Residential w/storm sewers, 100 yr. [TIME CONCENTRATION .. TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. · Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. · Lard Slope (5)..................... ....... = Travel Time of Sheet Flow................. · SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Tfme of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Chal'V"teL Slope (5)......................... = Manning'S Roughness Coef. (n)............. = Channel velocity (V)...................... = FLow Lertgth (l)........................... = Travel time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentr.tion..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = Stonm Duration............................ = 0.24000 100.00 (ft) 2.80 (in) 0.02000 15.26 (min) 1. 50000 0.02880 2.55 (ft/s) 850.00 (ft) 5.57 (min) 0.50 (ft) 0.01700 0.01300 9.41 (ft/s) 900.00 (ft) 1.59 (min) 22.41 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 24 ...-.....-'.".'...'1'r-.-- II 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 5 : MAN STAGE/AREA : COMP STAGE/DISC : Pe ." .Ilt Sedilllentation Basin [RATING CURVE LIMIT] Minimum ELevation......................... a Maximum Elevation......................... = Elevation Increment....................... · 930.00 (ft) 932.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file a NULL OUtput file a NULL [ManuaL Contour Area VB. ELevation] ELEVATION (ft) CONTWR AREA (sqft) 928.00 930.00 932.00 3991.00 8602.00 14608.00 [STAGE DISCHARGE INFORMATION] WTLET STRUCTURE: STR . 9 TYPE RECTANGULAR WEIR CONTRACTED DESCRIPTION Permanent Sedimentation Basin Spillway (contracted weir) Appendix - 25 1129/94 Page 1 HYDROGRAPH REPORT RECORD NlI4BER TYPE DESCRIPTION 15 RESER STOR. I NO 100 yr. flow from penunent sedimentation basin [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Ti~ Interval............................. = Time to Peak.............................. = Time of Base.............................. = Peak Elevation............................ = 41.22 (efs) 3.50 (acft) 5 (min) 730.00 (min) 1500.00 emin) 930.85 (ft) [INFLOW HYDROGRAPH INFORMATION] HydrogreFl1 ............................... = 14 Hydrograph Description.................... = Area G, Single Family Residential w/storm sewers, 100 yr. Appendix - 26 II II 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 16 COMPUTED FLOOD : Area H, 100 yr. Present [HYDROGRAPH INFORMATION] Peak Di.charge............................ & Volune.................................... = Time Interval............................. = Time to Peak.............................. = Time of Ba.e.............................. = Multiplication factor..................... & PJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interv.l............................. = Time to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Leg Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = Page 1 7.66 (cfs) 0.59 (aeft) 5 (min) n5.00 (min) 1470.00 (min) 1.00 8 CURVILINEAR UH 6.29 (efs) 484.00 5 (min) 13.42 (min) 67.10 (min) 1.00 (in) 12.08 (min) 1.86 (ac) 80 Appendix - 27 , -''-.'1'1"-'.- 1/29/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 16 COMPUTED FLOOO : Area H, 100 yr. Present [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (S)............................ = TraveL Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length el)........................... = TreveL Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... Channel Slope (5)......................... = Menning's Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipit.tion....................... = Return Period............................. = StOMm Dur.t;on............................ = Page 2 0.24000 200.00 (ft) 2.80 (in) 0.04000 20.13 (min) 0.00000 0.00000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 20.13 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 28 II II 1/29/94 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 17 COMBINE : Areas A-H, 100 yr. flow to Ash Tree Pond [HYDROGRAPH INFORMATION] TilDe Interval............................. = Ti_ to Peak.............................. = Time of Base.............................. = 100.45 (cfs) 15.71 (acft) 5 (min) 730.00 (min) 3750.00 (min) Peak Discharge............................ = Volume.................................... · [COMBINE HYDROGRAPH RECORD ,] HYDROGRAPH' 13 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. Flow a Maintenance Drive Peak Discharge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH' 15 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. flow from permanent sedimentation basin Peak Discharge........................ = 41.22 (cfs) Time to Peak.......................... = 730.00 (min) Time Interval......................... = 5 (m;n) HYDROGRAPH' 16 TYPE: COMPUTED FLOOD DESCRIPTION : Area H, 100 yr. Present Peek Disch.rge........................ = Time to Peak.......................... = Time Interval......................... = 52.99 (ds) 730.00 (m;n) 5 (m; n) 7.66 (ds) 725.00 (min) 5 (m;n) Appendix - 29 I' EDSC WATERSHED MODELING 1126/94 Page 1 RESERVOIR REPORT RECORD NUMBER : 6 STORAGE TYPE : MAN STAGE/AREA DISCHARGE TYPE : COMP STAGEIDISC DESCRIPTION : Ash Tree Pond (lower pond) [RATING CURVE LIMIT] MinilllLlll Elevation......................... = MaxillllD Elevation......................... = Elevation Increment....................... = 927.50 (ft) 930.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file = NULL OUtput file = NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTWR AREA (sqft) 926.00 928.00 930.00 6355.00 26699.00 39292.00 [STAGE DISCHARGE INFORMATION] WTLET STRUCTURE: STR # 7 TYPE : RECTANGULAR WEIR CONTRACTED DESCRIPTION : Baffled Weir with 8" spacers, contracted portion STR # 8 TYPE : RECTANGULAR WEIR SUPPRESSED DESCRIPTION: Baffled Weir, overtopped portion (suppressed) Appendix - 30 __~~._,~"_'--..._.......,_,......."_....~_..........._~~,....'-."...._.."'_._~~....'- _ _ ~_._"__~..-..__.__.~"....o".,,"""" '.,.. ._...-'....."___,_,..~.,,.~^....._.........~,..'_. ._...._,..._,_..__..._._...___......_..~.~,_._,. < ...- .._".._.~"~~"_~~._.__'___--___~.<_.... 1/26/94 WATERSHED MOOELING...continued... Page 2 RESERVOIR REPORT RECORD NUMBER : 6 STORAGE TYPE : MAN STAGE/AREA DISCHARGE TYPE : COMP STAGE/DISC DESCRIPTION : Ash Tree Pond (lower pond) [Reservoir Discharge Value vs. Stage] (the elevation increment is 0.2) -.-.----------------------------------------------------------------------- STAGE ELEVATION CONTOUR AREA STORAGE DISCHARGE (ft) (ft) (sqft) (cuft) (efs) --------------------------------------------------------------------------- 0.00 927.50 6355.00 0.00 0.00 0.20 927.70 23647.40 3000.24 0.00 0.40 927.90 25681.80 7933.16 0.00 0.60 928.10 27328.65 13234.21 0.00 0.80 928.30 28587.95 18825.87 7.65 1.00 928.50 29847.25 24669.38 30.89 1.20 928.70 31106.55 30764.77 62.83 1.40 928.90 32365.85 37112.01 105.05 1.60 929.10 33625.15 43711. 11 1n.88 1.80 929.30 34884.45 50562.07 257.33 2.00 929.50 36143.75 57664.89 354.84 2.20 929.70 37403.05 65019.57 463.60 2.40 929.90 38662.35 n626.11 582.44 Appendix - 31 "' 1129/94 HYDROGRAPH REPORT RECORD NlJ4BER TYPE DESCRIPTION 18 RESER STOR. I NO 100 yr. flow from Ash Tree Pond [HYDROGRAPH INFORMATION) Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Peak Elevation............................ = (INFL~ HYDROGRAPH INFORMATION] Page 1 98.54 (cfs) 15.41 (acft) 5 (mi n) 730.00 (min) 3750.00 (min) 928.87 (ft) Hydrograp, .,.............................. = 17 Hydrograph Description.................... = Areas A-H, 100 yr. flow to Ash Tree Pond Appendix - 32 - - II .1 1129/94 HYDROGRAPH REPORT RECORD NlI4BER TYPE DESCRIPTION 19 COMPUTED FLOOD : Aree I, 100 yr. Present [HYDROGRAPH INFORMATION] Peek Discharge............................ = Volume.................................... = Time Interval............................. = T;me to Peek.............................. = T;me of Bese.............................. · Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time IntervaL............................. = Tillie to Peak.............................. = Tirne of Base.............................. = Rainfall Excess........................... = Basin Leg Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NtJlCer.............................. = Page 1 90.07 (e:fs) 9.86 (ee:ft) 5 (min) 735.00 (m;n) 1540.00 (m;n) 1.00 9 CURVILINEAR UH 74.80 (e:fs) 484.00 5 (min) 23.96 (m;n) 119.81 (m;n) 1.00 (in) 21.57 (min) 39.50 (ee:) n Appendix - 33 " 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 19 COMPUTED FLOOD : Area I, 100 yr. Present [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning'. Roughness Coef. (n)............. = Flow length (l)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope ($)............................ = Travel Time of Sheet Flow................. = SHAllOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radfus (R)...................... = Channel Slope (S)......................... = Manning's Roughness Coef. (n)............. = Channel velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow FLow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFAll DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = Stonm Duration............................ = Page 2 0.24000 250.00 eft) 2.80 (in) 0.04000 24.06 (mfn) 1.50000 0.02200 2.22 (ft/s) 1450.00 (ft) 10.86 (mfn) 0.50 (ft) 0.01200 0.01300 7.91 (ft/s) 483.00 (ft) 1.02 (mfn) 35.94 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 34 1129/94 HYDROGRAPH REPORT RECORD UBER TYPE DESCRIPTION 20 COMPUTED FLOOD : Are. J, 100 yr. Present [HYDROGRAPH INFORMATION] Pe.k Disch.rge............................ = Volume.................................... = TiM Interval............................. = Time to Pe.k.............................. = Time of B.se.............................. = Multiplication f.ctor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrogr.ph .......................... = Unit hydrogr.ph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = Page 1 38.61 (cfs) 3.68 (acft) 5 (mi n) 730.00 (min) 1515.00 (min) 1.00 10 CURVILINEAR UH 35.60 (cfs) 484.00 5 (min) 19.41 (min) 97.06 (min) 1.00 (in) 17.47 (min) 15.23 (ac) 71 Appendix - 35 11'29/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 20 COMPUTED FLOOD : Area J, 100 yr. Present [TIME CONCENTRATION -- TR-55] SHEET FL~ Manning's Roughness Coef. (n)............. K Flow Length (L)........................... = 2-yr 24.hr Rainfall (R)................. K Land Slope (S)............................ = Travel Time of Sheet Flow................. = SHALL~ FL~ K_toef (surface description) (K).......... = Watercourse Slope (S)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FL~ Hydraulic Radius (R)...................... = Channel Slope (5)......................... = Manning's Roughness Coef. (n)............. = Channel VeLocity (V)...................... = FLow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] DistributiOll Type......................... = Total Precipitation....................... K Return Period............................. = Stonm Duration............................ = Page 2 0.24000 180.00 (ft) 2.80 (in) 0.02900 21.04 (m;n) 1.50000 0.01400 1.n (ft/s) 860.00 (ft) 8.08 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (m;n) 29.12 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 36 '!'I IrT ------.--'...-..-- 1129/94 HYDROGRAPH REPORT Page 1 RECORD NlJ4BER TYPE DESCRIPTION 21 CCltBINE : Areas A-J, Flow into Upper Wetland 183W [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... · T i IRe I ntervel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . = Time to Peak.............................. = Time of Base.............................. = [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 20 TYPE: COMPUTED FLOOD DESCRIPTION : Area J, 100 yr. Present Peak Dfsch.rge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH # 19 TYPE: CCltPUTED FLOOD DESCRIPTION : Area I, 100 yr. Present Peak Disch.rge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH # 18 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. flow. from Ash Tree Pond Peak Discharge........................ = Tillie to Peak.......................... = Time Interval......................... = 223.15 (cfs) 28.95 (adt) 5 (min) 730.00 (min) 3750.00 (min) 38.61 (ds) 730.00 (min) 5 (min) 90.07 (ds) 735.00 (min) 5 (mi n) 98.54 (cfs) 730.00 (min) 5 (mi n) Appendix - 37 - " - " 1129/94 P.ge 1 RESERVOIR REPORT RECORD NUMBER : 7 STORAGE TYPE : MAN STAGE/AREA DISCHARGE TYPE : COMP STAGE/DISC DESCRIPTION : Upper (west) Wetl.nd 183W [RATING CURVE LIMIT] Mini... Elevation......................... = Maximum Elev.tion......................... = Elevation Increment....................... = 921.30 (ft) 928.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file · NULL OUtput file = NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTOUR AREA (sqft) 923.00 924.00 926.00 928.00 242110.00 258231. 00 283651.00 316046.00 (STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR . : 10 TYPE : RECTANGULAR WEIR SUPPRESSED DESCRIPTION : Natural divide between Upper and lower Wetland 183W Appendix - 38 1129/94 Page 1 HYDROGRAPH REPORT RECORD NlJIIBER TYPE DESCRIPTION 22 RESER STOR. IND 100 yr. flow frOlll Upper Wetland 183 W, Present Conditions [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval.........:................... = Ti. to Peak.............................. = Ti.. of Base.............................. . Peak Elevation............................ = 45.68 (cfs) 20.51 (acft) 5 (mi n) 790.00 (min) 3920.00 (min) 923.53 (ft) [INFLOW HYDROGRAPH INFORMATION] HydrograJ]l1 'I.............................. = 21 Hydrograph Description.................... = Areas A-J, Flow into Upper Wetland 183W Appendix - 39 " ------------ 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 23 COMPUTED FLOOD : Area K, Present 100yr [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication fector..................... = [UNIT HYDROGRAPH INFORMATION) Unit hydrograph ,......................... = Unit hydrogreph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = Page 1 72.49 (ds) 6.55 (aeft) 5 (mf n) 730.00 (mfn) 1510.00 (mfn) 1.00 11 CURVILINEAR UH 68.26 (cfs) 484.00 5 (mfn) 17 .45 emf n) 87.25 (mfn) 1.00 (in) 15.70 (mfn) 26.25 (ac) 72 Appendix - 40 ,. ...--."'-'_._....-----_..._-~.,_.,~--~.._.,...;-------~._-.".-_.-.......-.--"-.._-~_.~----"->--.. 1129/94 HYDROGRAPH REPORT RECORD NlItBER TYPE DESCRIPTION 23 COMPUTED FLOOO : Area K, Present 100yr [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning'S Roughness Ceef. (n)............. = Flow Lertgth (L)........................... = 2-yr 24-hr Rainfall (R)................. = L.nd Slope (S)............................ · Trevel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (l)........................... = Tr.vel Time of Shallow Flow............... · CHANNEL FLOW Hydraulic Radius (R)...................... = Chal'Vlel Slope (S)......................... = Manning'S Roughness Ceef. (n)............. = Channel Velocity (V)...................... = Flow Length (l)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentr.tion..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = TotaL Precipitation....................... = Return Period............................. = Sto~ Duration............................ = Page 2 0.24000 300.00 (ft) 2.80 (in) 0.05000 25.47 (min) 1.50000 0.13000 5.41 (ft/s) 230.00 (ft) 0.71 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 26.17 (min) ses II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 41 1129/94 HYDROGRAPH REPORT RECORD NUMBER 24 Page 1 TYPE CHANNEL MOD ATT DESCRIPTION : Routed 100 yr outflow from Upper Wetland 183W [HYDROGRAPH INFORMATION] .':-, Peek Discharge............................ = Volume.................................... = Tfme Interval............................. = Time to Peak.............................. · Time of Base.............................. · [CHANNEL MODIFIED ATT-KIN INFORMATION] Modified ATT-KIN routing coef x........... · Modified AlT-KIN routing ceef m........... = Modified AlT-KIN routing coef Cm.......... = Reach Length.............................. = Reach Velocity............................ = Cross Sectional Area...................... = Trenslatiort tilDe.......................... = [INFLOW HYDROGRAPH INFORMATION] Hydrograp, .,.............................. = Hydrograph Description.................... = 43.18 (cfs) 20.51 (aeft) 5 (min) 815.00 (min) 3925.00 (min) 0.02506 1.66670 0.29840 720.00 ft 0.51 ftls 90.45 sqft 0.00000 min 22 100 yr. flow from Upper Wetland 183 W, Present Conditions Appendix - 42 " 1129/94 Page 1 HYDROGRAPH REPORT RECORD NlJ4BER TYPE DESCRIPTION 25 COMBINE : Areas A"K, 100 yr discharge at constriction below 5 Hawks School [HYDROGRAPH INFORMATION] Peek Di.ch.rge............................ = 72.49 (cfs) 27.07 (acft) 5 (min) 730.00 (lIin) 3925.00 (min) Volume.................................... = Time Interval............................. · Ti_ to peak.............................. · Time of Base.............................. · [COMBINE HYDROGRAPH RECORD ,] HYDROGRAPH # 23 TYPE: COMPUTED FLOOD DESCRIPTION : Area K, Present 100yr Peak Discharge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH' 24 TYPE: CHANNEL MOD ATT DESCRIPTION : Routed 100 yr outflow from Upper Wetland 183W peak Discharge........................ = 43.18 (cfs) Time to Peak.......................... = 815.00 (min) Time Interval......................... = 5 (min) 72.49 (cfs) 730.00 (min) 5 (mi n) Appendix - 43 - " 1129/94 HYDROGRAPH REPORT Page 1 RECORD NlJtBER TYPE DESCRIPTION 26 COMPUTED FLOOD : Area L, Present 100 yr. Flow to 5 Hawks Ave. Wetland [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... · Ti. Interval............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape F.ctor.............................. = Time Interval............................. = TilDe to Peak............... ............... = Time of Base.............................. = Rainfall Excess........................... Basin Lag Time............................ = [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] DESCRIPTION AREA CN# Residential, 1/3 acre lots Residential, 1/4 acre lots Residential, Townhouses Church and adjacent street School Open spece, with woods and brush Overall Approximation 75.79 (cfs) 8.09 (aeft) 5 (mi n) 735.00 (min) 1485.00 (min) 1.00 12 TRIANGULAR UH 63.02 (cfs) 484.00 5 (mi n) 22.05 (min) 58.81 (min) 1.00 (in) 19.85 (min) 2.39 72 3.39 75 7.17 85 5.34 80 4.88 75 7.46 58 30.63 74 Appendix - 44 11'29/94 HYDROGRAPH REPORT - Page 2 RECORD NLMBER TYPE DESCRIPTION 26 COMPUTED FLOOD : Area L, Present 100 yr. Flow to 5 Hawks Ave. Wetland [TIME CONCENTRATION -- TR.55] SHEET FLOW Manning'S Roughness Coef. (n)............. a Flow Length (L)........................... a 2-yr 24-hr Rainfall (R)................. a Land Slope ($)............................ = Trlvel Time of Sheet Flow................. = SHALLOW FLOW K_coef (surface description) (K).......... = Watercourse SLope (5)..................... = Velocity (V).............................. a FLow Length (l)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW - HydrauLic Radius (R)...................... = Ch8rv\eL SLope (5)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = FLow Length (L)........................... = Travel Time of Shallow Flow............... a .... TIME OF CONCENTRATION Tillie of Concentration..................... = [RAINFALL DESCRIPTION) -" Distribution Type......................... = Total Precfpit.tion....................... = Return Period............................. a Storm Duration............................ a 0.24000 300.00 (ft) 2.80 (in) 0.03330 29.96 (min) 2.00000 0.05780 4.81 (ft/s) 900.00 (ft) 3.12 (min) 0.00 eft) 0.00000 0.20000 0.00 (ft/s) 0.00 eft) 0.00 (min) 33.08 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 45 -'~ ........... EDSC WATERSHED MODELING 1/28/94 Page 1 RESERVOIR REPORT RECORD NlJ4BER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 8 MAN STAGE/AREA ca4P STAGE/DISC Five Hawks Ave. Wetland, Present 100 yr. [RATING CURVE LIMIT] Minimum Elevation......................... . Maximum Elevation......................... . Elevation Increment....................... . 913.50 eft) 918.00 (ft) 0.20 eft) [STAGE STORAGE INFORMATION] Input file · NULL Output file. NULL [Manual Contour Area vs. Elevation] ELEVAT ION (ft) CONTWR AREA Csqft) 914.00 916.00 918.00 2000.00 25420.00 132060.00 [STAGE DISCHARGE INFORMATION] WTLET STRUCTURE: STR , : 11 TYPE : MANUAL RATING CURVE DESCRIPTION: Natural Spillway from Five Hawks Ave. Wetland Appendix - 47 '" .. .....'1~.,.." 1128/94 OUTLET STRUCTURE REPORT Page 1 RECORD NUMBER : 11 TYPE : MANUAL RATING CURVE DESCRIPTION : Natural Spillway from Five Hawks 'Ave. ~etland [RATING CURVE LIMIT) Mini... Elevation......................... = Maximum Elevation......................... = Elevation Increment....................... . [FILE INFORMATION) [Manual Flow Value vs. Elevation] 913.50 (ft) 918.00 (ft) 0.20 (ft) ------------------------------------------------ ELEVATION (ft) FLOW (efs) ..---...-....-.-....---..-----.-----------.----- 915.00 915.50 916.00 916.50 917.00 66.18 107.69 166.75 238.39 329.55 [Culvert ~eir Discharge Value vs. Stage] (the elevation increment is 0.2) STAGE .....-.-...---......-.....-----.........-.-----.---------- ELEVATION (ft) FLOW (efs) ---------.-..---..-.------------.------------------------- 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 2.60 2.80 913.70 913.90 914.10 914.30 914.50 914.70 914.90 915. 10 915.30 915.50 915.70 915.90 916.10 916.30 8.82 17.65 26.47 35.30 44.12 52.94 61.77 74.48 91.09 107.69 131.31 154.94 181.08 209.73 Appendix - 48 1/28/94 RECORD NUMBER TYPE DESCRIPTION ..<~'t"""" OUTLET STRUCTURE REPORT Page 2 : 1 1 : MANUAL RATING CURVE : Natural Spillway from Five Hawks Ave. Wetland [Culvert Weir Discharge Value vs. Stage] (the elevation increment is 0.2) STAGE 3.00 3.20 3.40 ELEVATION eft) FLOY (cfs) 916.50 916.70 916.90 238.39 274.85 311.32 Appendix - 49 II ------'---'--< .....'1.....- Co "..; -~ (I") ~ Q D - . (I") ~ ,..., -~ ~ ~ N '+-l '-' ' U ~ d rn -~ ~ ~ N 0 U) ~ -~ ~ - .~ -~ rn - It) c:) Q '"" (r) Q C) co, Q '"" N Q Q N Q '"" - Q C) - C) '"" Q '0 Co (SJ~) BD'MVH::JSIG Appendix - 50 - ., ..._..,~... 1128/94 Page 1 HYDROGRAPH REPORT RECORD NlJ4BER TYPE DESCRIPTION 28 RESER STOR. IND 100 yr. flow from 5 Hawks Ave. Wetland, Present Conditions [HYDROGRAPH INFORMATION) Peak Di.charge............................ · Volume.................................... · Time Interval............................. · Time to Peak.............................. = Time of Ba.e.............................. · Peak Elevation............................ · 140.69 (ds) 34.60 (aeft) 5 (min) 735.00 (min) 3450.00 (min) 915.98 eft) [INFLOW HYDROGRAPH INFORMATION) Hydrograph #.............................. = 27 Hydrograph Description.................... = Areas A-L, 100 yr. flow to 5 Hawks Ave. Wetland Appendix - 51 .,.'-'t...... H Y D R A U L I C R E P 0 RTF 0 R WATER SURFACE PROFILING FIVE HAWKS CREEK 100 YEAR FLOW, PRESENT CONDITIONS City of Prior Lake, Minnesota Prepared by Valley Engineering Co., Inc. 7301 Ohms Lane, Suite 500 Minneapollis, MN 55431 January 28, 1994 E.D.S Corporation Appendix - 52 '~.--'1 ..""Ii'" NGINEERING DATA SYSTEMS CORPORATION ater Surfece Profiling Summery Report ate 01/28/94 Time 16:56: 16 File 5HA\nCS.WPS Report Pege 1 ~OJECT: 100 YR. STREAM FLOW .ac zes Dep zc EGles Qlob Qch Qrob Vch Wwet ft ft ft ft cfs , cfs cfs HIs ft 1 914.11 2.41 913.95 914.10 0.00 140.69 0.00 6.15 14.99 2 915.18 2.38 914.91 915.81 0.00 140.69 0.00 6.39 12.50 __3 916.01 2.81 915.24 916.29 0.34 140.35 0.00 4.23 20.44 4 916.35 2.85 914.51 916.35 1.16 138.53 0.40 0.56 159.61 5 916.37 2.12 914.48 916.31 0.08 140.50 0.11 0.34 280.60 Appendix - 53 .'.--"1"'- NGINEERING DATA SYSTEMS CORPORATION Water Surface Profiling Detailed Report Date 01/28/94 File 5HAWKS.WPS ~OJECT: 5 HAWKS CREEK, PRESENT Time 17:12:39 Report Page 1 Chamel Station 0 + 67 DiSCharge 140.69 cfs Q AREA VEL CONVEYANCE n RCH LGTH WET PERM ets ft-2 ft/s ft ft 0.00 0.00 0.00 0_00 0.1250 60.00 0.00 140.69 22.88 6.15 1078.55 0.0400 67.00 16.01 0.00 0.00 0.00 0.00 0.1250 70.00 0.00 --ection ft Ob vhamel Rgt Db ater Elevation zas Depth Dep -energy Grade Line-EGLas 'nergy Loss ht Hin of Elev Shot zmin ~hamel Slope Sch nergy Loss Fr hf _nergy Loss Eddy ho Wetted Width Wwet --ve Reach Lgth Lave 914.11 ft 2.41 ft 914.70 ft 0.00 ft 911.70 ft 1.67 " 1.14 ft 0.00 ft 14.99 ft 14.99 ft _~ross Section Groundshots <ft> 1 5 -56.0 2.0 919.3 2 911 .7 6 -9.0 9.0 Critical Water zc Normal water zn Flow SUBCRITICAL FL~ METHOD Average Conveyance Velocity Head Hv Velocity Coeff alpha Offs Lft Water Line xlw Offs Rgt Water Line xrw Jump Loss hjump Jump Elevation zjump Station of Jump Ljump 913.95 ft 914.12 ft 0.59 ft/s 1.00 -6.96 ft 8.02 ft N 1 A N / A N 1 A 915.1 3 914.5 7 -2.0 44.0 0.0 911.7 911.7 4 915.8 Appendix - 54 ......,..- Date 01128/94 ~ Ie 5HAIoIlCS.WPS 10JECT: 5 HAUKS CREEK, PRESENT Time 17:12:39 Report Page 2 !:Ct i on 2 Channel Station 1 + 33 Discharge 140.69 cfs Q AREA VEL CONVEYANCE n RCH LGTH \leT PERM cfs ft-2 ft/s ft ft It Ob 0.00 0.00 0.00 0.00 0.1250 57.00 0.00 Channel 140.69 22.00 6.39 1100.80 0.0400 66.00 14.08 .btOb 0.00 0.00 0.00 0.00 0.1250 20.00 0.00 ...lIter Elevation zaa 915.18 ft Critical Water zc 914.97 ft Depth Dep 2.38 ft Normal water zn 915.18 ft - lergy Grade Llne-EGLas 915.81 ft Flow SUBCRITICAL FLOW lergy Losa ht 1.12 ft METHOD Average Conveyance Min of Elev Shot zmin 912.80 ft Velocity Head Hv 0.63 ft/s '-'annel Slope Sch 1.67 X Veloei ty Coeff alpha 1.00 'lergy Loss F r hf 1.10 ft Offs Lft Water Line xlw -5.n ft tnergy Loss Eddy ho 0.01 ft Offs Rgt Water Line xrw 6.78 ft Wetted Width Wwet 12.50 ft J~ Loss hjurp N / A lie Reach Lgth Lave 12.50 ft J~ Elevation zjurp N / A Station of J~ Lj~ N / A --.-'-'-."-.'- ... - u, . , -i"oss Section Groundshots eft> 1 .~ -52.0 3.0 921.5 2 912.8 6 -11.0 13.0 919.8 3 919.1 7 -3.0 62.0 912.8 4 921.0 0.0 912.8 Appendix - 55 ....-'1..-.,- Date 01/28/94 -He 5HAWS.WPS ROJECT: 5 HAWS CREEK, PRESENT Time 17: 12:40 Report Page 3 ection 3 Chamel Station 1 + 82 Discharge 140.69 cfs Q AREA VEL CONVEYANCE n RCH LGTH WET PERM cfs ft.2 ft/s ft ft _ft Db 0.34 0.93 0.36 4.43 0.1250 10.00 3.69 Chamel 140.35 33.15 4.23 1855.91 0.0400 49.00 17.92 -gt Ob 0.00 0.00 0.00 0.00 0.1250 38.00 0.00 Water Elevation zas 916.01 ft Cd tical Water zc 915.24 ft -Depth Dep 2.81 ft Normal water zn 915.79 ft nergy Grade Line-EGLas 916.29 ft Flow SUBCRITICAL FLOW "nergy Loss ht 0.47 ft METHOD Average Conveyance Min of Elev Shot zmin 913.20 ft Velocity Head Hv 0.28 ft/s -,hamel Slope Sch 0.82 X Velocity Coeff alpha 1.05 nergy Losa Fr hf 0.44 ft Offs Lft Water Line xlw -12.66 ft Energy Loss Eddy ho 0.04 ft Offs Rgt Water Line xrw 7.78 ft ~tted Width ~t 20.44 ft J~ Loss hj~ N I A ve Reach Lgth Lave 20.44 ft J~ Elevation zj~ N I A Station of J~ Lj~ N I A 'ross Section Grounclshots eft> 1 ''"5 915.5 3 916.7 7 913.2 -3.0 47.0 913.2 4 918.4 0.0 -52.0 3.0 921.5 2 913.3 6 -9.0 9.0 Appendix - 56 - " - ., '~:~'J"''''''~ . Date 01/28/94 i le 5HA~S.UPS ~OJECT: 5 HA~S CREEK, PRESENT Time 17: 12:40 Report Page 4 ectlon 4 Chamel 5tetion 2 + 12 Discharlle 140.69 cfs Q AREA VEL CONVEYANCE n RCH LGTH \leT PERM cfs ft'2 ft/s ft ft ,ft Ob 1.76 9.89 0.18 71.54 0.1250 30.00 20.85 Chamel 138.53 249.45 0.56 5635.n 0.1000 30.00 133.06 it Ob 0.40 2.46 0.16 16.39 0.1250 30.00 5.84 "ater Elevation zas 916.35 ft Critical "ater zc 914,51 ft ...D.epth Oep 2.85 ft Normal water zn 915.25 ft nerllY Grade Line-EGLas 916.35 ft Flow SUBCRITICAL FLOU ~nerllY Loss ht 0.07 ft METHOD Average Conveyance Mln of Elev Shot zllln 913.50 ft Velocity Head Hv 0.00 ft/s hamel Slope 5ch 1.00 X Velocl ty Coeff alpha 1.05 nerllY Loss Fr hf 0.04 ft Offs Lft "ater Line xlw -88.83 ft EnerllY Loss Eddy ho 0.03 ft Offs RlIt "ater Line xrw 70.78 ft J1etted "idth \lwet 159.61 ft J~ Loss hj~ N I A ve Reach LlIth Lave 159.61 ft J~ Elevation zj~ N I A Suti on of J~ Lj~ N I A ross Section Groln:tshots <ft> 1 .280.0 .-5 65.0 926.0 2 .125.0 915.5 6 82.0 918.0 3 918.0 7 -68.0 190.0 915.4 4 926.0 0.0 913.5 Appendix - 57 "f'If - .~~~'t--~ ";,f Date 01/28/94 -Fi le 5HAIlICS.\lPS )ROJECT: 5 HAIlICS CREEK, PRESENT Time 17:12:40 Report Page 5 iection 5 Channel Station 2 + 42 Discharge 140.69 cfs Q AREA VEL CONVEYANCE n RCH LGTH IoIET PERM cta ft-2 ft/s ft ft .ft Ob 0.08 1.18 0.07 4.52 0.1250 30.00 6.43 ChaMel 140.50 408.64 0.34 8104.05 0.1000 30.00 265.06 --'lgt Ob 0.11 1.68 0.07 6.46 0.1250 30.00 9.18 Water Elevation zas 916.37 ft Critical Water zc 914.48 ft _Depth Dep 2.72 ft Normal water zn 915.29 ft Energy Grade Lfne-EGLa. 916.37 ft Flow SUBCRITICAL FLOU Energy Loss ht 0.01 ft METHOD Average Conveyance Min of Elev Shot zmln 913.65 ft Velocity Head Hv 0.00 ft/s --ChaMe l Slope Sch 0.50 X Velocity Coeff alpha 1.01 :nergy Loss Fr hf 0.01 ft Off. Lft Water Line xlw -206.42 ft Energy Loss Eddy ho 0.00 ft Offs Rgt Water Line xrw 74.18 ft Jetted Width \Net 280.60 ft J~ Loss hj~ N / A ~ve Reach Lgth Lave 280.60 ft J~ Elevation zj~ N / A Station of J~ Lj~ N I A --:ross Section Groundshots eft> 1 -310.0 ..5 65.0 926.0 2 -235.0 916.0 6 115.0 918.0 3 -200.0 918.0 7 190.0 916.0 4 926.0 0.0 913.7 Appendix - 58 ., ......,~ 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 1 COMPUTED FLOOD : Are. A, Future - 100 yr. [HYDROGRAPH INFORMATION] Pe.k Disch.rge............................ . Volume.................................... a Time Interval............................. . Time to Peak.............................. = Time of a.S8.............................. . Multiplic.tion factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrogr.ph t......................... . Unit hydrogr.ph type...................... . Peak Discharge............................ = Shape F.ctor.............................. = TilDe Interval............................. = Time to Peak.............................. = Time of a.S8....... ....................... = Rainfall Excess........................... = B.sin Llg Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NlIJi)er.............................. = Page 1 11.61 (ds) 1.22 (.cft) 5 (mfn) 735.00 (mfn) 1505.00 (mfn) 1.00 1 CURVI LI NEAR UH 8.24 (ds) 484 . 00 5 (mf n) 22.59 (mfn) 112.93 (mfn) 1.00 (in) 20.33 (mfn) 4.10 (ac) 78 Appendix - 59 .'.-'f~.. 1129/94 HYDROGRAPH REPORT RECORD NlJ4BER TYPE DESCRIPTION 1 COMPUTED FLOOD : Area A, Future - 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manningls Roughness Coef. (n)............. = Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (S)............................ = Travel Time of Sheet Flow................. . SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (S)..................... = Velocity (V).............................. = Flow Len:gth (l)........................... = Trevel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Channel Slope (S)......................... = Manning's Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... . Total Precipitation....................... = Return Period............................. = Storm Duration............................ = Page 2 0.24000 133.00 eft) 2.80 (in) 0.01300 22.77 (min) 1.50000 0.00250 0.75 (ft/s) 500.00 (ft) 11.11 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 33.88 (mln) SCS II 6.00 (in) 100 (yr) 24.00 (hr) App~ndix - 60 " ~ ......,~. 1129194 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 2 RESER STOR. I NO 100 yr. discharge from Area A [HYDROGRAPH INFORMATION] Peak Discharge............................ . Volume.................................... . Time Interval............................. . Time to Peak.............................. = Time of Base.............................. = Peak Elevation............................ . [INFLOW HYDROGRAPH INFORMATION] Page 1 5.23 (cfa) 1.20 (aeft) 5 (min) 755.00 (min) 1540.00 (min) 970.58 eft) Hydrograph fl.............................. . Hydrograph Description.................... = Area A, Future' 100 yr. Appendix - 61 --,,--..,---~ M II ."-'f~}' 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 3 COMPUTED FLOOD Area B, Future 100 yr. [HYDROGRAPH INFORMATION] Peak Disch.rge............................ z Volume.................................... . Time Interv.l............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph ,......................... = Unit hydrograph type...................... = Peek Discharge............................ = Sh.pe F.ctor.............................. = Time Interval............................. = Time to Peak.............................. = Time of B.se.............................. = R.infall Excess........................... z Basin Leg Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NlJIt>er.............................. = Page 1 22.05 (cfs) 1.92 (aeft) 5 (min) n5.00 (min) 1490.00 (min) 1.00 2 CURVILINEAR UH 15.03 (cfs) 484.00 5 (m;n) 16.55 (min) 82.74 (m;n) 1.00 (in) 14.89 (m;n) 5.48 (ac) 84 Appendix - 62 .,.,. ---wr---- 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 3 COMPUTED FLOOD : Area B, Future 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow Length (l)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (S)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = CharYlel 'Slope (5)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Trevel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION) Distribution Type......................... = ToteL Precipitation.,...................... = Return Period............................. = Stonm Dur.tion............................ = Page 2 0.24000 120.00 (it) 2.80 (in) 0.02000 17.65 (min) 1.50000 0.00700 1.25 (ft/s) 540.00 (ft) 7.17 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 24.82 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 63 " .-r 1129/94 HYDROGRAPH REPORT RECORD NlJ4BER : 4 TYPE : COMPUTED FLOOD DESCRIPTION : Area C, Future 100 yr. [HYDROGRAPH INFORMATION] Pe.k Dfsch.rge............................ . Volume.................................... = Tfme Interv.l............................. . Tille to Peak.............................. = Tfme of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interv.l............................. . Time to Peak.............................. = Tille of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = [RAINFALL DESCRIPTION] DistribJtiOl'\ TY'Pf!......................... = Total Precipit8tion....................... = Return Period............................. = Stonm Dur.tion............................ = P.ge 1 0.00 (cfs) 0.00 (acft) 5 (mi n) 0.00 (min) 0.00 (min) 1.00 3 TRIANGULAR UH 0.00 (cfs) 484.00 5 (mi n) 20.00 (mfn) 53.33 (min) 1.00 (in) 18.00 (min) 0.00 (ac) 58 30.00 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 64 " 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 5 COMPUTED FLOOD : Area D, Future 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Ti_ to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Ti. Interval............................. = Time to Peak.............................. = T file of Base.............................. = Rainfall Excess........................... = Basin Lag TilDe............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = Page 1 32.43 (cfs) 3.51 (acft) 5 (min) 735.00 (min) 1525.00 (min) 1.00 4 CURVI LI NEAR UH 21.83 (efs) 484.00 5 (m;n) 23.80 (m;n) 119.02 (m;n) 1.00 (;n) 21.42 (m;n) 11.45 (ae) 79 Appendix - 65 1/29/94 HYDROGRAPH REPORT RECORD NlItBER TYPE DESCRIPTION 5 COIPUTED FLOOO : Area D, Future 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. = Flow Length (l)........................... = 2-yr 24-hr Rainfall (R)................. = LaM Slope (5)............................ = Travel Time of Sheet Flow................. ~ SHALLOW FLOW K_Coef (surface description) (K).......... ~ Watercourse SLope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow FLow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Ch8r1"'tel Slope (5)... ..... ................. = Manning's Roughness Coef. (n)............. = Channel velocity (V)...................... = FLow Length (l)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] D;str;bJt;OI1 Type......................... = Total Precipitation....................... ~ Return Period............................. = Stonm Dur.tion............................ = Page 2 0.17000 300.00 (ft) 2.80 (in) 0.01800 29.08 (min) 1. 50000 0.01800 2.01 (ft/s) 800.00 (ft) 6.63 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 35.71 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 66 1/29/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER : 6 TYPE COMBINE DESCRIPTION : Combined drainage areas upstream of 170th St. [HYDROGRAPH INFORMATION] Peak Discharge............................ · Voll.llle.................................... = Time Interval............................. . Time to Peak.............................. · Time of lase.............................. · [COMIINE HYDROGRAPH RECORD #] HYDROGRAPH # 2 TYPE: RESER STOR. IHD DESCRIPTION : 100 yr. discharge from Area A Peak Discharge........................ · Time to Peak.......................... · Time Interval......................... · HYDROGRAPH # 3 TYPE: COMPUTED FLOOD DESCRIPTION : Area I, Future 100 yr. Peak Discharge........................ = Tille to Peak.......................... = Ti. Interval......................... = HYDROGRAPH # 4 TYPE: COMPUTED FLOOD DESCRIPTION : Area C, Future 100 yr. Peak Discharge........................ = Time to Peak.......................... = Tillie Interval......................... = HYDROGRAPH # 5 TYPE: COMPUTED FLOOD DESCRIPTION : Area D, Future 100 yr. Peak Discharge........................ · Time to Peak.......................... = Time Interval......................... · 56.64 (ds) 6.64 (aeft) 5 (min) 730.00 (min) 1540.00 (min) 5.23 (efs) 755.00 (min) 5 (min) 22.05 (efs) 725.00 (min) 5 (min) 0.00 (efs) 0.00 (min) 5 (mi n) 32.43 (efs) 735.00 (min) 5 (mi n) Appendix - 67 'I"! II 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 2 : MAN STAGE/STOR COMP STAGEIDISC Pond a Car Wash/Cabinet Shop [RATING CURVE LIMIT] Minh'LIlI Elevation......................... = Maximum Elevation......................... = Elevation Increment....................... = 963.00 (ft) 967.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file = NULL OUtput file = NULL [Manual Storage vs. Elevation] ELEVATION (ft) STORAGE (ef) 964 . 00 966.00 967.00 10.00 100.00 200.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR tI 2 F..:..cP TYPE CIRCULAR eGIUlIetn:1t I1ETAL PIPE w/ mitered to slope DESCRIPTION Future 24" Culverts lM'lCIer 170th St. 800 ft west of STH 13 Appendix - 68 II 1129/94 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 7 RESER STOR. I ND : 100 yr. discharge from 170th St. Culvert [HYDROGRAPH INFORMATION] Peak Discharge............................ = Vol~.................................... = Time Interval............................. = Tille to Peak.............................. · TiMe of Base.............................. . Peak Elevatior1............................ = 56.50 (ds) 6.64 (aeft) 5 (mi n) 730.00 (min) 1545.00 (min) 966.24 (ft) [INFLOW HYDROGRAPH INFORMATION] Hydrograph tI.............................. = 6 Hydrograph Description.................... = Combined drainage areas upstream of 170th St. Appendix - 69 1/29/94 HYDROGRAPH REPORT RECORD NlJIBER : 8 TYPE : COMPUTED FLOOD DESCRIPTION : Area E, Future 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ . Volume.................................... = Time Interval............................. = Time to Pe.k.............................. = Time of Base.............................. = Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape F.ctor.............................. = Time Interval............................. = Tinae to Peak.............................. = Tl. of aase.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NlJ'I1t::)er.............................. = Page 1 14.97 (cfs) 1.16 (aeft) 3 (min) 726.00 (min) 1482.00 (min) 1.00 5 CURVI LINEAR UH 13.27 (cfs) 484 . 00 3 (min) 14.05 (min) 70.27 (min) 1.00 (in) 12.65 (min) 4.11 (ac) 76 Appendix - 70 1129/94 HYDROGRAPH REPORT RECORD NUMBER : 8 TYPE COMPUTED FLOOD DESCRIPTION : Area E, Future 100 yr. [TIME CONCENTRATION -- TR-SS] SHEET FL~ Manning's Roughness Coef. (n)............. = Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (5)............................ = Travel Time of Sheet Flow................. = SHALL~ FL~ K_Coef (surface description) (K).......... = Watercourse Slope (S)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FL~ Hydraulic Radius (R)...................... = Cha".-.el Slope (5)......................... = Manningls Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of ShalLow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = StOnR Duration............................ = Page 2 0.24000 180.00 (ft) 2.80 (in) 0.04300 17.98 (min) 1. 50000 0.00800 1.34 (ft/s) 250.00 (ft) 3.11 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 21.08 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 71 - " 1129/94 Page 1 HYDROGRAPH REPORT RECORD N\J4BER TYPE DESCRIPTION 9 COMBINE : Ccnilinecl Areas A_E, Flow to 3611 RCP [HYDROGRAPH INFORMATION] Pe.k Discharge............................ = Volume.................................... = Time Interval............................. = Time to Pe.k.............................. = Time of B.se.............................. = 69.80 (cfs) 7.79 (.eft) 5 (mi n) 730.00 (min) 1545.00 (min) [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 7 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. discharge from 170th St. Pe.k Disch.rge........................ = Time to Pe.k.......................... = Time Interv.l......................... = HYDROGRAPH # 8 TYPE: COMPUTED FLOOD DESCRIPTION : Are. E, Future 100 yr. Peak Discharge........................ = Time to Pe.k.......................... = TilDe Interval......................... = Culvert 56.50 (efs) 730.00 (m;n) 5 (m;n) 14.97 (cfs) 726.00 (min) 3 (m;n) Appendix - 72 - - II .1 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 3 : MAN STAGE/AREA : COMP STAGEIDISC : Ditch north of 170th St. [RATING CURVE LIMIT) Mini.... Elev.tioo......................... = Maximum Elev8tion......................... = Elevation Increment....................... · 956.67 (ft) 963.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file · NULL Output file. NULL [Manual Contour Area vs. Elevation] ELEVATION eft) CONTOUR AREA (sqft) 958.00 960.00 962.00 963.00 10.00 852.00 8564.00 10927.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR , 3 TYPE : CIRCULAR CONCRETE w/ square edge w/ headwall DESCRIPTION : 36" RCP At $\I corner of Westbury Ponds plat Appendix - 73 1129/94 Page 1 HYDROGRAPH REPORT RECORD NlIIBER TYPE DESCRIPTION 10 RESER STOR. I NO 100 yr flow from Areas A-E [HYDROGRAPH INFORMATION] Time Interval............................. = Time to Peak.............................. = Time of Base........................... ... = Peak Elevation............................ = 62.09 (cfs) 7.79 (acft) 5 (min) 735.00 (min) 1540.00 (min) 961.85 eft) Peak Di.charge............................ = Volume.................................... = [INFLOW HYDROGRAPH INFORMATION] Hydrograph t.............................. = 9 Hydrograph Description.................... = Combined Areas A_E, Flow to 36" RCP Appendix - 74 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 11 COMPUTED FLOOO : Area F, Single family residential w/storm sewer 100 yr [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = TiMe Interval............................. · TiMe to Peak.............................. = Time of Base.............................. · Multiplfcation factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Ti. to Peak.............................. = T i IRe of Base.............................. = Rainfall Excess........................... = Basin Lag Tillie............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. = 73.80 (ds) 4.36 (acft) 3 (mi n) 720.00 (min) 1470.00 (min) 1.00 6 CURVILINEAR UH 87.95 (ds) 484.00 3 (mi n) 13.63 (min) 68.13 (min) 1.00 (in) 12.26 (min) 26.41 (ac) 75 Appendix - 75 '" II 1129/94 HYDROGRAPH REPORT Page 2 RECORD NUMBER TYPE DESCRIPTION 11 COMPUTED FLOOD : Area F, Single family residential w/stonR sewer 100 yr [TIME CONCENTRATION .- TR-55] SHEET FLOW Manning's Roughness Coef. (n)............. s Flow Length (L)........................... = 2-yr 24-hr Ra;nfall (I)................. = Land Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow length (l)........................... s Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Chal'V'M!l Slope (5)......................... = Manning's Roughness Coef. (n)............. = ChanneL Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFAll DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = Stonm Duration............................ = 0.24000 100.00 (ft) 2.80 (in) 0.02000 15.26 (min) 1 .50000 0.01000 1.50 (ft/s) 300.00 (ft) 3.33 (min) 0.75 (ft) 0.02500 0.01300 14.96 (ft/s) 1660.00 (ft) 1.85 (min) 20.44 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 76 - " - " 1129/94 HYDROGRAPH REPORT RECORD NLMBER TYPE DESCRIPTION 12 COMBINE : Areas A-F, 100 yr. inflow to pond [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. s Time of B.se.............................. s [COMBINE HYDROGRAPH RECORD ,] HYDROGRAPH' 10 TYPE: RESER STOR. IND DESCRIPTION : 100 yr flow from Areas A-E Peak Discharge........................ = Time to Peak.......................... = Time Interval......................... = HYDROGRAPH' 11 TYPE: COMPUTED FLOOD DESCRIPTION : Are. F, Single family residential Peak Discharge........................ = Tillie to Peak.......................... = Time Interv.l......................... = Page 1 121.00 (cfs) 12.16 (ac:ft) 5 (min) 720.00 (min) 1540.00 (min) 62.09 (c:fs) 735.00 (min) 5 (mi n) w/storm sewer 100 yr 73.80 (cfs) 720.00 (min) 3 (mi n) Appendix - 77 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 4 : MAN STAGE/AREA : COMP STAGE/DISC : Upper Pond (1800) [RATING CURVE LIMIT] M;n;mum Elevation......................... = Maximum Elevation......................... = Elevation Increment....................... = 929.50 (ft) 934.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file = NULL OUtput file = NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTWR AREA (sqft) 928.00 930.00 932.00 934.00 29682.00 38517.00 50995.00 60334.00 [STAGE DISCHARGE INFORMATION] WTLET STRUCTURE: STR . 4 TYPE CIRCULAR CONCRETE w/ square edge w/ headwall DESCRIPTION Maintenance Drive Culverts STR . 5 TYPE RECTANGULAR WEIR SUPPRESSED DESCRIPTION: Maintenance Drive Weir Appendix - 78 ~ II - II 1129/94 HYDROGRAPH REPORT RECORD NlItBER TYPE DESCRIPTION 13 RESER STOR. IND 100 yr. Flow i Maintenance Drive [HYDROGRAPH INFORMATION] Peak Discharge............................ K Volume.................................... K Time Interval............................. . Time to Pe.k.............................. = Time of B8se.............................. = Peak El.vation............................ = [INFLOW HYDROGRAPH INFORMATION] Page 1 101.29 (cfs) 11.28 (.eft) 5 (mi n) 730.00 (min) 1645.00 (min) 931.81 (ft) Hydrograph t.............................. = 12 Hydrograph Description.................... = Areas A-F, 100 yr. inflow to pond Appendix - 79 ~ 1/29/94 HYDROGRAPH REPORT Page 1 RECORD lIlI4BER TYPE DESCRIPTION 14 cotPUTED FLOOD : Area G, Single Family Residential w/storm sewers, 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Tillie of 88se.............................. = Multiplication factor..................... = OJNIT HYDROGRAPH INFORMATION] Unit hydrograph #......................... = Unit hydrogr8ph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve NlI'IJI::)er.............................. = 43.43 (cfs) 3.50 (acft) 5 (min) n5.00 (min) 1495.00 (min) 1.00 7 CURVILINEAR UH 38.93 (efs) 484.00 5 (min) 14.94 (min) 74.71 (min) 1.00 (in) 13.45 (min) 12.82 (ac) 75 Appendix - 80 1/29/94 HYDROGRAPH REPORT Page 2 RECORD NUMBER TYPE DESCRIPTION 14 cotPUTED FLOOO : Area G, Single Family Residential w/storm sewers, 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FLaJ Manning's Roughness Coef. (n)............. = Flow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. · Lard Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLaJ FLaJ K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (L)........................... · Travel Time of ShaLlow Flow............... = CHANNEL FLaJ Hydraul ic Radius (R)...................... · Channel Slope (5)......................... = Manning's Roughness toef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = Total Precipitation....................... = Return Period............................. = Storm Duration............................ · 0.24000 100.00 (ft) 2.80 (in) 0.02000 15.26 (min) 1. 50000 0.02880 2.55 (ft/s) 850.00 (ft) 5.57 (min) 0.50 (ft) 0.01700 0.01300 9.41 (ft/s) 900.00 (ft) 1.59 (min) 22.41 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 81 ----,,-.- '1 1/29/94 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 15 RESER STOR. I NO 100 yr. flow from pel'lll8nent sedimentation basin [HYDROGRAPH INFORMATION] Peak Discharge............................ = 41.22 (cfs) 3.50 (acft) 5 (mi n) 730.00 (min) 1500.00 (min) 930.85 (ft) Volume.................................... = Time Interv.l............................. · Time to Peak.............................. = Time of B.se.............................. = Peak ElevetiOl'\............................ = [INFLOW HYDROGRAPH INFORMATION] Hydrograph tI.............................. = 14 Hydrogr.ph Description.................... = Area G, Single Family Residential w/storm sewers, 100 yr. Appendix - 82 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 16 COMPUTED FLOOD : Area H, Future 100 yr. [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... z Time Interv.l............................. · Ti.. to Peak.............................. z Ti.. of B.se.............................. = Multiplic.tion factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Pe.k Disch.rge............................ = Shape F.ctor.............................. = Time Interv.l............................. z Tille to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin LaSl TilDe............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve Number.............................. z Page 1 7.76 (cfs) 0.59 (.dt) 4 (min) 724.00 (min) 1472.00 (min) 1.00 8 CURVILINEAR UH 6.29 (ds) 484.00 4 (min) 13.42 (min) 67.10 (min) 1.00 (in) 12.08 (min) 1.86 (ac) 80 Appendix - 83 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 16 CCltPUTED FLOOD : Area H, Future 100 yr. [TIME CONCENTRATION -- TR-SS] SHEET FLOW Manning's Roughness Ceef. (n)............. . Flow Length (L)........................... = Z-yr 24-hr Rainfall (R)................. = Land Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef Csurface description) (K).......... = Watercourse Slope (5)..................... = Velocfty (V).............................. = Flow Length (l)........................... = Travel Time of Shallow Flow............... . CHANNEL FLOW Hydraulic Radius (R)...................... = Ch81'V"teL SLope (S)......................... = Manning's Roughness Ceef. (n)............. ChanneL Velocity (V)...................... = Flow Length (l)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] DistribJtiOl"t Type......................... = Total Precipit.tion....................... = Return Period............................. = Stonm Dur.tion............................ = Page 2 0.24000 200.00 (ft) 2.80 (in) 0.04000 20.13 (min) 0.00000 0.00000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 20.13 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 84 rr II 1129/94 HYDROGRAPH REPORT Page 1 RECORD UBER TYPE DESCRIPTION 17 COMBINE : Areas A-H, 100 yr. flow to Ash Tree Pond [HYDROGRAPH INFORMATION] Peak Discharge... ................ ......... · Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. · [COMBINE HYDROGRAPH RECORD .] 147.59 (cfs) 15.36 (aeft) 4 (m;n) 728.00 (m;n) 1644.00 (min) HYDROGRAPH' 13 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. Flow a Maintenance Drive Peak Discharge........................ = Time to Peak.......................... · Time Interval......................... = HYDROGRAPH' 15 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. flow from permanent sedimentation basin Peak Disch.rge........................ = 41.22 (cfs) Time to Peak.......................... = 730.00 (min) Time Interval......................... = 5 (min) HYDROGRAPH' 16 TYPE: COMPUTED FLOOD DESCRIPTION : Area H, Future 100 yr. Peak Discharge........................ = Time to Peak.......................... · T;me Interval......................... = 101.29 (cfs) 730.00 (min) 5 (mi n) 7.76 (efs) 724.00 (min) 4 (min) Appendix - 85 - " - " 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 18 RESER STOR. IND 100 yr. flow from Ash Tree Pond [HYDROGRAPH I N FORMAT I ON] Peak Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.. ............. .... ........... · Time of Base.............................. = Peak Elevation............................ = [INFLOW HYDROGRAPH INFORMATION] Page 1 144.41 (efs) 15.05 (acft) 4 (min) 728.00 (min) 1652.00 (min) 929.02 (ft) Hydrograph ............................... = 17 Hydrograph Description.................... = Areas A-H, 100 yr. flow to Ash Tree Pond Appendix - 86 - " 1129/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 6 : MAN STAGEIAREA : COMP STAGEIDISC : Ash Tree Pond (lower pond) [RATING CURVE LIMIT] Minimum Elevation......................... = Maxi.um Elevation......................... · Elevation Increment....................... = 927.50 (ft) 930.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file = NULL OUtput file · NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTOUR AREA (sqft) 926.00 928.00 930.00 6355.00 26699 . 00 39292.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR . 6 TYPE RECTANGULAR WEIR CONTRACTED DESCRIPTION Baffled Weir with 8" spacers, contracted portion STR . TYPE DESCRIPTION 7 RECTANGULAR WEIR SUPPRESSED Baffled Weir, overt.......,J portion (suppressed) Appendix - 87 ----,.,-......-,- 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 19 COMPUTED FLOOD : Area I, Future 100yr [HYDROGRAPH INFORMATION] Peak Discharge............................ = VolUllll!. . . . .. ....... . .. . ... ............. . . . .. Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrogreph type...................... = Peak Discharge............................ = Shape Factor.............................. · Time Interval............................. .. Time to Peak.............................. = Time of 88se.............................. = Rainfall Excess........................... = Basin Lag Tille............................ = [BASIN DESCRIPTION] Watershed Area............................ · Curve Number.............................. = Page 1 90.07 (ds) 9.86 (adt) 5 (mi n) 735.00 (min) 1540.00 (min) 1.00 9 CURVILINEAR UH 74.80 (ds) 484.00 5 (min) 23.96 (min) 119.81 (min) 1.00 (in) 21.57 (min) 39.50 (ac) n Appendix - 88 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 19 cc>>tPUTED FLOOO : Area I, Future 100yr [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning-s Roughness Coef. (n)............. = FLow Length (L)........................... = 2-yr 24-hr Rainfall (R)................. = Land Slope (S)............................ · Travel Time of Sheet Flow................. · SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (5)..................... = Velocity (V).............................. = Flow Length (l)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Charvwl Slope (5).......................... = Manning-. Roughness teef. (n)............. = Channel Velocity (V)...................... = FLow Ler-.gth el)........................... = Travel Time of Shallow Flow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] Distribution Type......................... = TotaL Precipit8tion....................... = Return Period............................. = Stonm Duration............................ = Page 2 0.24000 250.00 (ft) 2.80 (in) 0.04000 24.06 (min) 1.50000 0.02200 2.22 (ft/s) 1450.00 (ft) 10.86 (min) 0.50 (ft) 0.01200 0.01300 7.91 (ft/s) 483.00 (ft) 1.02 (min) 35.94 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 89 - " -- " 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 20 COMPUTED FLOOD : Area J, Future 100 yr. [HYDROGRAPH INFORMATION] Peak Disch.rge............................ = Volume.................................... = Time Interval............................. = Time to Pelk.............................. = Tillie of Base.............................. = Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Tille I nterva 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = TilDe to Peak.............................. = Time of Base.............................. = Rainfall Excess........................... = Basin Lag Time............................ = [BASIN DESCRIPTION] Watershed Area............................ · Curve Nunber.............................. · Page 1 38.61 (cfs) 3.68 (aeft) 5 (mi n) 730.00 (min) 1515.00 (min) 1.00 10 CURVI LI NEAR UH 35.60 (c:fs) 484.00 5 (m;n) 19.41 (min) 97.06 (min) 1.00 (in) 17.47 (min) 15.23 <ac) 71 Appendix - 90 - " - " "...,~'t' 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 20 COMPUTED FLOOD : Area J, Future 100 yr. [TIME CONCENTRATION -- TR-55] SHEET FL~ Manning's Roughness Coef. (n)............. = Flow Length (L)........................... . 2-yr 24-hr R.infall (R)................. . L.nd Slope (5)............................ . Travel Time of Sheet Flow................. . SHALL~ FL~ K_coef (surface description) (K).......... = Yatercourse Slope (5)..................... · Velocity (V).............................. = Flow Length (L)........................... · Travel Time of Shallow Flow............... · CHANNEL FL~ Hydraulic Radius (R)...................... . Channel Slope (S)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length eL)........................... = Travel Time of Shallow Flow............... . TIME OF CONCENTRATION Time of Concentr.tlon..................... = [RAINFALL DESCRIPTION] Distribution Type......................... · Tot.l Precipitation....................... · Return Period............................. = Storm Dur.tion............................ · Page 2 0.24000 180.00 (ft) 2.80 (in) 0.02900 21.04 (mfn) 1.50000 0.01400 1.77 (ft/s) 860.00 (ft) 8.08 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 29.12 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 91 fI " ., .,....,.....- 1/29194 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 21 COMBINE : Areas A-J, Flow into Upper Wetland 183W [HYDROGRAPH INFORMATION] Peak Discharge............................ = Volume.................................... · Time Interval............................. = Time to Peak.............................. · Time of Base.............................. = (COMBINE HYDROGRAPH RECORD .] HYDROGRAPH' 20 TYPE: COMPUTED FLOOD DESCRIPTION : Area J, Future 100 yr. Peak Discharge........................ · Time to Peak.......................... · Time Interval......................... = HYDROGRAPH' 19 TYPE: COMPUTED FLOOD DESCRIPTION : Area I, Future 100yr Peak Discharge........................ · Time to Peak.......................... · Time Interval......................... · HYDROGRAPH' 18 TYPE: RESER STOR. IND DESCRIPTION : 100 yr. flow from Ash Tree Pond Peak Discharge........................ · Time to Peak.......................... · Time Interval......................... = 268.50 (cfs) 28.57 (acft) 5 (min) 730.00 (min) 1650.00 (min) 38.61 (ds) 730.00 (min) 5 (m;n) 90.07 (ds) 735.00 (min) 5 (min) 144.41 (ds) 728.00 (min) 4 (min) Appendix - 92 .,.....,.~. 1129194 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 7 : MAN STAGEIAREA : COMP STAGEIDISC : Upper (west) Wetland 183W [RATING CURVE LIMIT] Minimum Elevation......................... . Maximum Elevation......................... . Elevation Increment....................... = 921.50 (ft) 928.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file · NULL Output file. NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTOUR AREA (sqft) 923.00 924.00 926.00 928.00 242110.00 258231.00 283651.00 316046.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR . 9 TYPE RECTANGULAR WEIR SUPPRESSED DESCRIPTION I~roved divide between Upper and lower Wetland 183W STR . TYPE OESeR I PTI ON 11 CIRCULAR CONCRETE wI square edge wI headwall Future culvert at outlet from Upper Wetland 183W Appendix - 93 .. ., 1/29194 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 22 RESER STOR. I ND 100 yr. flow from Upper Wetland 183 W, Future Conditions [HYDROGRAPH INFORMATION] Peak Discharge.......................,.... . 13.41 (ds) 26.42 (acft) 5 (IIi n) 985.00 (min) 7200.00 (min) 924.80 (ft) Volume.................................... . Tfme Interval............................. . Time to Peak.............................. . Tfme of Base.............................. . Peak Elevation............................ . [INFLOW HYDROGRAPH INFORMATION] Hydrograph ............................... . 21 Hydrograph Description.................... . Areas A-J, Flow into Upper Wetland 183W Appendix - 94 11 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 24 CHANNEL MOD A TT : Routed 100 yr outflow from Upper Wetland 183W [HYDROGRAPH INFORMATI<>N] Peak Discharge............................ c Volume.................................... · Time Interval............................. · Time to Peak.............................. = Time of 88se.............................. · [CHANNEL MODIFIED ATT-KIN INFORMATI<>N] Modified ATT-KIN routing coef x........... = Modified ATT-KIN routing coef m........... . Modified ATT-KIN routing coef Cm.......... c Reach Length.............................. · Reach Velocity............................ · Cross Sectional Area...................... = Translation time.......................... = [INFLOW HYDROGRAPH INFORMATION] 13.40 (cfs) 26.42 (aeft) 5 (min) 1015.00 (min) 7200.00 (min) 0.02506 1.66670 0.19398 720.00 ft 0.31 ftls 43.36 sqft 0.00000 min Hydrograph ............................... = 22 Hydrograph Description.................... = 100 yr. flow from Upper Wetland 183 W, Future Conditions Xppendix - 95 .......,~..~ 1129194 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 23 COMPUTED FLOOD Area K, Future 100 yr [HYDROGRAPH INFORMATION] Page Peak Discharge............................ = 72.49 (cfs) Volume.................................... . 6.55 (acft) Time Interval............................. . 5 (min) Time to Peak.............................. Appendne.Qll (~e) Time of Base.............................. . 1510.00 (mfn) Multiplication factor..................... . 1.00 VJNIT HYDROGRAPH INFORMATION] Unit hydrograph .......................... . Unit hydrograph type...................... . Peak Disch.rge............................ = Shape Factor.............................. = Time Interval............................. = Time to Peak.............................. & Time of Base............ ....... ........... · Rainfall Excess........................... & DG51n Leg .llDe............................ = [BASIN DESCRIPTION] Watershed Area............................ = Curve N\JIt)er.............................. = 11 CURVILINEAR UH 68.26 (ds) 484.00 5 17.45 87.25 1.00 15.70 (min) (m;n) (min) ( in) (m;n) 26.25 (ac) n . Appendix - 96 .,.,"~.. 1129/94 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 23 : COMPUTED FLOOO : Area K, Future 100 yr [TIME CONCENTRATION -- TR-55] SHEET FLOW Mannlngls Roughness Coef. (n)............. = Flow length (L)........................... = 2-yr 24-hr Rainfall (R)................. . Land Slope (5)............................ = Travel Time of Sheet Flow................. = SHALLOW FLOW K_Coef (surface description) (K).......... = Watercourse Slope (S)..................... = Velocity (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Channel Slope (S)......................... = Manning'S Roughness Coef. (n)............. = Channel Velocity (V)...................... = Flow Length (L)........................... = Travel Time of Shallow Flow............... . TIME OF CONCENTRATION Time of Concentr.tion..................... = [RAINFALL DESCRIPTION] D t s t r i btJt i ort Type......................... = Total Precipitation....................... = Return Period............................. = Storm Duration............................ = Page 2 0.24000 300.00 (ft) 2.80 (in) 0.05000 25.47 (min) 1.50000 0.13000 5.41 (ft/s) 230.00 (ft) 0.71 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (mln) 26.17 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 97 1-- 1/29194 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION 25 COMBINE : Areas A-K, 100 yr discharge at constriction below 5 Hawks School. [HYDROGRAPH INFORMATION] Peak Disch.rge............................ = Volume.................................... · Time Interval............................. · Time to Peak.............................. · Time of Base.............................. · 72.68 (cfs) 32.97 (ac:ft) 5 (min) 730.00 (min) 7200.00 (min) [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH' 23 TYPE: COMPUTED FLOOD DESCRIPTION : Area K, Future 100 yr Peak Discharge........................ = Time to Peak.......................... z Time Interval......................... · HYDROGRAPH' 24 TYPE: CHANNEL MOD ATT DESCRIPTION : Routed 100 yr outflow from Upper Yet land 183Y Peak Disch.rge........................ . 13.40 (cfs) Time to Peak.......................... = 1015.00 (min) Time Interval......................... . 5 (min) 72.49 (ds) 730.00 (m;n) 5 (mi n) Appendix - 98 1129/94 HYDROGRAPH REPORT Page 1 RECORD NUMBER TYPE DESCRIPTION 26 COMPUTED FLOOO : Area L, Future 100 yr. Flow to 5 Hawks Ave. Wetland [HYDROGRAPH INFORMATION] Peak Di.charge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. = Multiplication factor..................... = [UNIT HYDROGRAPH INFORMATION] Unit hydrogreph .......................... = Unit hydrograph type...................... = Peak Discharge............................ = Shape Factor.............................. = Time Interval............................. = Time to P.ek.............................. = Time of Base............... .... ....... .... '" Rainfall Excess........................... = Besin Lag Tillie............................ = [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] DESCRIPTION AREA CN# Residential, 1/3 acre lots Residential, 1/4 acre lots Residential, Townhouses Church and adjacent street School Open space, with woods and brush OVerall Approximation 80.72 (ds) 8.40 (acft) 5 (mi n) 730.00 (min) 1530.00 (min) 1.00 12 CURVILINEAR UH 63.02 (ds) 484.00 5 (min) 22.05 (min) 110.27 (min) 1.00 (in) 19.85 (min) 2.39 72 3.39 75 7.17 85 5.34 80 4.88 75 7.46 58 30.63 75 Appendix - 99 1129/94 HYDROGRAPH REPORT Page 2 RECORD NUMBER TYPE DESCRIPTION 26 COMPUTED FLOOD : Area L, Future 100 yr. Flow to 5 Hawks Ave. Wetland [TIME CONCENTRATION -- TR-55] SHEET FLOW Manning'S Roughness Coef. (n)............. = Flow Length (L)........................... . 2-yr 24-hr Rainf.ll (R)................. = Land SLope (5)............................ = Travel Time of Sheet flow................. = SHALL~ FLOW K_Coef (surface description) (K).......... = Watercourse Slope (S)..................... = Veloci ty (V).............................. = Flow Length (L)........................... = Travel Time of Shallow Flow............... = CHANNEL FLOW Hydraulic Radius (R)...................... = Channel Slope (5)......................... = Manning's Roughness Coef. (n)............. = Channel.Velocity (V)...................... = Flow Length (l)........................... = TraveL Time of ShaLLow FLow............... = TIME OF CONCENTRATION Time of Concentration..................... = [RAINFALL DESCRIPTION] DistribJtiOl'l Type......................... = Total Precipitation....................... = Return Period............................. = Storm Duration............................ = 0.24000 300.00 (ft) 2.80 (in) 0.03330 29.96 (min) 2.00000 0.05780 4.81 (ft/s) 900.00 (ft) 3.12 (min) 0.00 (ft) 0.00000 0.20000 0.00 (ft/s) 0.00 (ft) 0.00 (min) 33.08 (min) SCS II 6.00 (in) 100 (yr) 24.00 (hr) Appendix - 100 !1 - IIr 1130/94 Page 1 RESERVOIR REPORT RECORD NUMBER STORAGE TYPE DISCHARGE TYPE DESCRIPTION : 8 : MAN STAGEIAREA : COMP STAGEIDISC Five Hawks Ave. Wetland, Future 100 yr. [RATING CURVE LIMIT] Mini.. ElevatiOl1......................... = Maxillllll Elevation......................... = Elevation Increment....................... . 912.80 (ft) 922.00 (ft) 0.20 (ft) [STAGE STORAGE INFORMATION] Input file · NULL Output file = NULL [Manual Contour Area vs. Elevation] ELEVATION (ft) CONTOUR AREA (sqft) 914.00 916.00 918.00 920.00 922.00 2000.00 25420.00 132060.00 360532.00 417260.00 (STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: STR . : 14 TYPE : CIRCULAR CONCRETE wI square edge wI headwall DESCRIPTION : PROr~c~ 12" DIA. ALTERNATE STR . : 13 TYPE : RECTANGULAR WEIR CONTRACTED DESCRIPTION: Proposed 920.66 Emergency Spillway at Outlet from 5 Hawks Ave. W Appendix - 101 1130/94 Page 1 OUTLET STRUCTURE REPORT RECORD NUMBER TYPE DESCRIPTION 15 RECTANGULAR WEIR CONTRACTED PROPOSED 921.37 EMERGENCY SPILLWAY [RATING CURVE LIMIT] Minillllll Elevation......................... = Maxillllll Elevation......................... . Elevation Incr~t....................... . 921.40 (ft) 923.00 (ft) 0.10 (ft) [OUTLET STRUCTURE INFORMATION] Crest Length.............................. = Crest Elevation........................... 50.00 (ft) 921.40 (ft) Coefficient ew............................ = Exportent i a l. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = 3.33000 1.50000 [RECTANGULAR CONTRACTED EQUATION] Q . Cw(L-0.2H)HAexp H = Headwater depth above inlet control section invert, (ft) L . Crest length, (ft) Appendix - 102 1130/94 OUTLET STRUCTURE REPORT Page 1 RECORD NIJ4BER TYPE DESCRIPTION 12 CIRCULAR CONCRETE wI square edge wI headwall Proposed 9M dia. outlet from 5 Hawks Ave. Wetland [RATING CURVE LIMIT] MinilllJll Elevation......................... = MaxilllJll Elevation......................... . E l evat I on I ncrelllent . .. .. . . .. .. .. .. .. .. .. .. = [OUTLET STRUCTURE INFORMATION] Circular Radius........................... = Culvert Invert Elevation.................. = Slope..................................... = Maming's N-vallJe......................... = Orifice Coefficient....................... = Tai lwater. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . = Number barrels............................ = ~NSUBMERGED EQUATION] H/Diem . Hc/Diem + K *(Q/A*Diam^0.5))^M - 0.5*S^2 Coefficient K............................. = coefficient M............................. = [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam^0.5))^Z + Y - 0.5*S^2 Coefficient c............................. = Coefficient Y............................. = [DEFINITIONS] 912.80 (ft) 922.00 (ft) 0.10 (ft) 0.37500 eft) 912. t nn (ft) 0.00800 0.01300 1.00000 913.00000 (ft) 1 0.00980 2.00000 0.03980 0.67000 H · Headwater depth above inlet control section invert, (ft) Diem. lnerior height of culvert barrel, (ft) He . Specific head at critical depth (de + Vc^2/2g), (ft) Q = Discharge, (cuft/s) A · Full cross sectional area of culvert barrel, (sqft) S . Culvert barrel slope, (ft/ft) Appendix - 103 1130/94 Page 1 HYDROGRAPH REPORT RECORD NlJ4BER : 28 TYPE : RESER STOR. IND DESCRIPTION : 100 yr. flow from 5 Hawks Ave. Wetland, Future Conditions " 9 (!)R J 1= ICe.. tV ITI/ 92/. 37 JEMtl(.~C.'( .sPII..LWA.'( [HYDROGRAPH INFORMATION] Peek Discharge............................ = Volume.................................... = Time Interval............................. = Time to Peak.............................. = Time of Base.............................. . Peak Elevation............................ · 4.71 (c:fs) 34.60 (aeft) 5 (min) 1530.00 (min) 6750.00 (min) 921.36 (ft) [INFLOW HYDROGRAPH INFORMATION] Hydrograph ............................... = 27 Hydrograph Description.................... = Areas A-L, 100 yr. flow to 5 Hawks Ave. Wetland Appendix - 104 - " 1130/94 Page 1 OUTLET STRUCTURE REPORT RECORD NUMBER : 13 TYPE : RECTANGULAR WEIR CONTRACTED DESCRIPTION Proposed 920.66 Emergency Spillway at OUtlet from 5 Hawks Ave. W=*fD [RATING CURVE LIMIT] Minillllt Elevatiorl......................... = Maximum Elevation......................... = Elevation Increment....................... = 920.66 (ft) 923.00 (ft) 0.10 (ft) [OUTLET STRUCTURE INFORMATION] Crest Length.............................. = Crest Elevation........................... = 50.00 (ft) 920.66 (ft) Coefficient ew............................ = Exponential............................... = 3.33000 1.50000 [RECTANGULAR CONTRACTED EQUATION] Q . Cw(L-0.2H)H^exp H · Headwater depth above inlet control section invert, (ft) L · Crest length, (ft) Appendix - 105 llI- ~ 1130/94 OUTLET STRUCTURE REPORT Page 1 RECORD NlJ4BER TYPE DESCRIPTION 14 CIRCULAR CONCRETE wI square edge wI headwall PROPOSED 12" DIA. ALTERNATE [RATING CURVE LIMIT] Minimum Elevation......................... = Maxi....... ElevatiOl'l......................... = Elevation Increment....................... = [OUTLET STRUCTURE INFORMATION] Ci rcular Radius........................... = Culvert Invert Elevation.................. = Slope..................................... = Manning'S N-value......................... · Orifice Coefficient....................... = TaiLwater................................. = Number berrels............................ = [UNSUBMERGED EQUATION] H/Diem . Hc/Diem + K *(Q/A*Diam^0.5))^M - 0.5*S^2 Coefficient K............................. = coefficient M............................. = [SUBMERGED EQUATION] H/Diem = c*CQ/CA*Diam^0.5))^Z + Y - 0.5*S^2 Coefficient c............................. = Coefficient Y............................. = [DEFINITIONS] 912.80 Cft) 922.00 eft) 0.10 Cft) 0.50000 (ft) 912.79999 (ft) 0.00800 0.01300 1 .00000 913.59998 (ft) 1 0.00980 2.00000 0.03980 0.67000 H · Headwater depth above inlet control section invert, Cft) Diem · lnerior height of culvert barrel, Cft) Hc · Specific head at critical depth (de: + Vc^2/2g), Cft) Q = Discharge, (cuft/s) A · Full cross sectional area of culvert barrel, Csqft) S . Culvert barrel slope, (ft/ft) Appendix - 106 -~~---.r-----._---'-_.~~~----_..."-_.." 1130/94 Page 1 HYDROGRAPH REPORT RECORD NUMBER TYPE DESCRIPTION : 28 : RESER STOR. IND : 100 yr. flow from 5 Hawks Ave. Wetland, Future Conditions II I Z ()I( J ,: I CE. I() In( 92..0."" ~Me'lGWt.'1 .s- P I u.. fdJl\ '( [HYDROGRAPH INFORMATION] Peak Discharge............................ . Volume.................................... = Ti~ Interval............................. = Time to Peak.............................. . Time of Base.............................. . Peak ElevatiOl1............................ = 13.38 (cfs) 34.60 (ac:ft) 5 (min) 1315.00 (min) 3995.00 (min) 920.71 (ft) [INFLOW HYDROGRAPH INFORMATION] Hydrogreph ............................... = 27 Hydrograph Description.................... = Areas A-L, 100 yr. flow to 5 Hawks Ave. Wetland Appendix - 107 'NGINEERING DATA SYSTEMS CORPORATION vater Surface Profiling Summary Report ate 01130/94 File 5HAWKS.WPS ~ROj~CT= ~UTUR~ 100 YR. ~lOU See: zas Dep zc EGLas ft ft ft ft 1 912.32 0.62 912.32 912.57 2 913.53 0.73 913.31 913.64 Qlob c:fs 0.00 0.00 Qch cfs 13.38 13.38 Time 11 :30:47 Report Page 1 Qrob Vch Wwet cfs ftls ft 0.00 3.98 6.83 0.00 2.62 7.99 Appendix - 108