How to Fix a French Drain
A french drain is a simple drainage systems in which a pipe is laid at the base of a ditch and protected by a thick layer of gravel. French drains are commonly used in residential areas around the base of homes and are located behind retaining walls. Because of their simple construction, the drains will usually last years with no maintenance. However, you should check the drain for leaks periodically. If you notice any leakage, a French drain can be fixed with relative ease by following a few simple steps. Does this Spark an idea?
Instructions
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Examine the area where the water drains to see if it is clear, as blockage in this area is often the cause of drainage problems in a French drain. If there is any debris or foreign matter in the way of the downspout, clear it away.
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Using a shovel, clear away the gravel in the area where you suspect there is a leak. Patch any leaks in the pipe using a resin hardener applied to a woven roving cloth. Pour the resin onto the cloth and place the cloth over the leaking portion of the pipe. Allow to dry and inspect for leakage.
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If there aren't any pipe leaks to patch, verify that the depth of the pipe is at a lower point than the area from which it is draining. The pipe must be lower for proper water flow. The drainage area should be the lowest part of the French drain system. Deepen or re-route the ditch if necessary.
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Consult a professional plumber if you have tried the above steps and believe the drainage problem stems from buildup inside of the pipe. A plumber will insert a tool known as an eel into the drain to remove the blockage.
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Tips & Warnings
After laying gravel over the pipe in a French drain, place a layer of straw about four inches thick on top of the gravel and top off with the remaining gravel.
