A big problem for parking lots can be subsurface water problems that continually cause asphalt to fail in specific areas.
This underground water can come from a spring, a lot of clay in the sub-base, or even landscape islands that absorb water and allow water to filter under the pavement.
For this reason, French drains can be a significant part of many of our patching and resurfacing projects. We can relieve this underground water pressure by digging a trench or trough 18″ – 24″ deep. We install filter cloth and an open graded crushed stone in this trench line along with perforated plastic pipe. The open graded stone allows a place for water to collect and where the underground hydraulic pressure can be released. The trench is dug between this collection point and the release point. The release point can be a nearby catch basin inlet or a drainage ravine, etc. The filter cloth surrounding this system keeps mud, silt, etc. from getting into the stone and compromising its porosity. French drains are extremely effective for situations where constant water problems are an issue.
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