ASPHALT » Resurfacing » Repairs » Reconstruction » Decorative Pavement » Drain Repair & Installation » French Drain Installion » Standing Water          Problems » Storm Drain Repairs          and Installation » Utility Structure          Adjustments » Traffic Calming Devices SEALCOATING RECREATIONAL SERVICES CRACK & JOINT SEALING PAVEMENT MARKING & DESIGN CONCRETE SITE SERVICES CONSULTING FRENCH DRAIN INSTALLATION The most important function of a french drain is to intercept the water before it gets under a pavement section and to channel it into a drainage swale or catch basin on the property. In many cases, it is obvious where the water is coming from, but in some cases investigative work must be done. If the water source under the pavement cannot be prevented, then a french drain can be installed under the surface to channel the water through a piping system. French drain systems can be expensive and so a cost/benefit analysis should be done in each case. What is the cost of the drain relative to the amount of pavement system repairs it will eliminate? This is usually a function of how far the piping system has to travel before reaching an outlet. If there is only one water problem on a property in an irrigated island but the nearest catch basin is 500 linear feet away, the cost may not be worth the benefit. The Process: Locate all public underground utilities prior to the start of work and have locate order updated as needed. Have private service such as water, sewer and irrigation lines located as well. Notify tenants and block off the area. The crew will need room to dig through the pavement system, and load trucks and bring new materials to the site. Saw cut the edges of the excavation to provide a uniform edge. Dig the trench 24"-36" deep and 12"-18" wide. Maintain a constant grade of 1% at the bottom of the trench so that water does not stand. Place a layer of geotextile filter fabric in the entire trench followed by a slotted pipe in the bottom of the excavation. Fill fabric-lined trench with washed stone and wrap filter fabric over top of stone layer to prevent silt or fine aggregate from clogging the system. Compact the stone layer and install asphalt layer. The asphalt should be at least 6" deep and the top of the trench should be at least 4' wide to get maximum compaction.
Privacy Policy | info@pavementnetwork.com | Phone: 1.800.894.6317 © 2008 The Pavement Network