French Drain Design

Thinking of making your own French Drain system? Want to know the right French drain design? My experience will give you the facts and information you need.

The common French drain design is a simple way to move and disperse rain water that sits in an area. You must design your French drain carefully and place it efficiently. This is the same for a French drain for downspouts or any drain.

The best way to do this is to draw the site in a simple plan showing were the rain water lies or where the ground is just very wet and never dries out. Then work out a lower patch of dryer ground for a soak away pit or connection to a storm water drain, manhole or ditch. The best time to do this will be after heavy rain.

You will need to carry out a Percolation test to test the areas drainage capability. you will also need man power or women power to do some digging and filling. This can be hard work (depending on the scale of the French drain) but the end result is very rewarding.

There is no reason why you can’t design and install a French drain system by yourself. If you’re planning to install a French drain to cover a large area like a back yard, or ground sounding a basement, they will need a few channels connected which flow into a main trench or separate soak away pits for each channel.

The channels are filled and packed with gravel with ¼ to ½ inch stones that enable the water to flow through it with ease. The gravel or stones used in the French drain very often consist of small stones which even when packed together tightly and are buried allow a large amount of water to travel within it. This

French drain diagram may help you understand it.

As the french drain design is installed in soil it enables water to drain through. The bottom and sides of the trench are lined with porous gardening membrane which carries on up to the top and covers the channel enabling the excess water to freely flow through without any soil. This is then thaken away by the French drain pipe

One of the pressurising decisions to make is finding the area where the water is going eventually drain. Ideally a natural drain in the location like a ditch or stream would be perfect but a storm water drain or deep soak away would also suffice. Heres is further information on French drain installation

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