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HomeMy WebLinkAbout04 02 12 City Council Work Session - Pavement Degradation StudyCity of Prior Lake Municipal Pavement Management System Report Executive Summary At the direction of the City of Prior Lake, Kimley-Horn and Associates, Inc. (KHA) developed a municipal pavement management program to provide an accessible pavement inventory, as well as important management information, pertaining to the approximately 100 mile long roadway network under the City’s jurisdiction. In addition, the management system serves as a tool for developing short and long-term capital funding projections based on conceptual budget predictions. Existing pavement rating histories and other network inventory information was provided by Prior Lake in the form of a CartéGraph PavementView database. KHA utilized this information to develop six custom pavement deterioration curves to address the various pavement types, uses, and traffic volumes found in the Prior lake network. This information was then used as a basis in developing a conceptual 10-year work plan. The work plan optimizes funding by strategically allocating budgets to suit the specific needs of Prior Lake’s network. The goal of the 10-year work plan is to help the city plan and project strategic annual repair projects, which will cost-effectively maintain the roadway network. The total pavement area within the Prior Lake network was found to be approximately 14,897,097 square feet. This represents a total asset replacement value of approximately $179 million. The overall condition of the pavement network was found to be in very good condition, with a weighted average Overall Condition Index (OCI) rating of 83.0 on the 100 point scale. KHA generally recommends several changes to the current rating system utilized by Prior Lake to make the rating procedure easier and less time consuming. We also recommend verification of the existing pavement conditions to see how they correspond with the PASER method. This service could be provided by KHA, and would confirm that the ratings used in development of the 10-year plan are consistent with other programs we have developed that have been successful in cost-effectively maintaining a large pavement network. KHA organized the pavement data into the CartéGraph software program to assist in the development of a 10-year work plan, which is based on preliminary budget projections provided by the City of Prior Lake. Based upon the CartéGraph output, the 10-year work plan was developed to start in 2012. An annual budget of $2,826,000 was applied to the network over the 10 year time period. Of the $2,826,000, $436,000 was allocated annually to provide preventative maintenance repairs, and the remainder was left for the program to choose the most cost-effective rehabilitative or reconstruction repairs. The results of the 10-year plan analysis indicate that the budget has sufficient funds to repair all segments that require reconstruction (7 total) in the first two years of the plan. In the remaining eight years, no segments require reconstruction, and fewer segments require rehabilitation, so the system is unable to use the entire General budget allocation. Since the General budget is able to fund all reconstruction and rehabilitation repairs during the life of this work plan, with surplus funds not being utilized, the 10-year work plan is indicative of an adequately-funded network. The network level OCI falls from the current level of 83.0 to a 71.9 at the end of the th 10 year. With a higher average network OCI, more preventative maintenance repairs will be required (and should be performed) as opposed to rehabilitation and reconstruction. Based on these results, KHA recommends that Prior Lake reallocate its current total budget to provide an City of Prior Lake Municipal Pavement Management System March 2012 Page 2 of 2 increased Preventative Maintenance budget and a decreased General budget for rehabilitation and reconstruction repairs. KHA has also provided several alternate funding scenarios to provide additional parameters to help Prior Lake determine the ideal total budget and budget allocations. These scenarios include an OCI-Driven analysis (rather than Budget-Driven) and a 40-Year Extended analysis. Results from these scenarios are explained in the municipal pavement management system report. This comprehensive, centralized program will provide easy access to pavement information, allow for proper budget allocation to minimize pavement repair costs, and reduce overall pavement maintenance repair spending. This program is an investment that will save Prior Lake money by applying value engineered decisions now, therefore reducing the need for more costly repairs in the long run. Pavement Management Programs are not new to our industry, but how we use the technology that has been developed and proven in the field, and now incorporated into this municipal management system, represents an important step in asset management for the City of Prior Lake.