Pavement Management is the process of managing the life cycle of roadways to maximize the pavement life and to minimize the maintenance costs. This process inventories the streets into maintainable segments followed by a survey to determine the surface condition and rideability. This process helps determine what maintenance practices should be used based on the pavement condition to help maximize the life of the roadway. This analysis is usually followed with a multi-year maintenance plan that typically extends 40 years. Condition surveys are usually conducted every 3 years so changes in road conditions can be evaluated with maintenance treatments and deterioration rates.
In Salina, Engineering estimates about 273 centerline miles of roadway. There are about 258 miles (95%) paved streets (about 149 miles asphalt and 109 miles concrete), 8 miles (3%) of brick streets and 7 miles (2%) of unimproved roads or non-paved roads. There are about 11 miles of private streets, not including alleys.
In the past, Salina has used a number of maintenance methods to help extend the life of our asphalt and concrete streets. Asphalt maintenance practices have included pavement sealing, mill and inlay, micro-surfacing and total street reconstruction. Concrete maintenance practices have included concrete patching, diamond profiling and total street reconstruction. Our brick streets have served the community well over the years, but many have been removed or have been overlaid with asphalt pavement due to sub-base stabilization problems and the wear and tear of heavier vehicles. Reconstructing brick streets is expensive. This labor intensive construction method can be twice the expense as a new concrete street.
Generally, asphalt pavement in this part of the country can last about 30-40 years with basic maintenance, which includes pothole patching, pavement sealing and micro-surfacing (a liquefied asphalt application about 1/2-5/8” thick.) Other maintenance methods can extend the pavement even further beyond this point, such as mill and inlay where the top several inches of asphalt is ground off and new asphalt is laid on top. This method works if the base and lower layer of asphalt is in good condition.
In 2001, the Department of Public Works purchased a Pavement Management Software Program and contracted for a pavement condition survey. The information was used to inventory our network of streets, determine the roadway surface and provide data on surface and structural conditions. Between 2008-2010, the Public Works Department updated the CarteGraph software and the street inventory, linked the CarteGraph software to the GIS, divided the streets into 1-4 block pavement segments and installed software to track routine street improvements.
In 2011, the City contracted with Infrastructure Management Services (IMS) of Rolling Meadows, IL to complete a detailed inventory and surface condition rating of designated City roadways. This survey provided information on the condition of each pavement segment which helps to determine what type of maintenance is required to maximize the longevity of the road, identify rehabilitation needs, develop strategies and propose a maintenance budget. The result should lower the cost of maintaining City streets over the life cycle of the pavement by strategically performing the right type of maintenance at the right time. Delaying necessary street maintenance at critical times in the life cycle of the pavement can result in more expensive types of maintenance in the future.
With limited funding resources from gas tax and sales tax to pay for street repairs, pavement condition information helps City staff prioritize the different types of maintenance options for each street segment in order to maximize the life cycle of the pavement at a minimum cost. This approach positions the City to take a more proactive approach to managing the maintenance and construction of our local transportation system. The City of Salina transportation system is valued at approximately $571M based on reconstruction at today's costs. With an annual Capital Improvement Program (CIP) Sub-CIP Street maintenance budget of between $2.4M to $3.0M each year, the $40,000 cost for the condition survey is considered a small price to pay in order to optimize our investment.
On August 19, 2013, the Department of Public Works, Engineering Work Group provided this Pavement Management System PowerPoint to the City Commission and interested parties.
On November 23, 2015, The Department of Public Works, Engineering Work Group provided this Street Funding information to the City Commission and interested parties.