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French drains and rear wall drainage in your garden


How to install a frech drain in your garden - A French drain is a drain with no pipe. The water collects in a gravel or stone filled channel that starts from the surface or just below it. The advantage of a French drain is that it is easy to construct and with the use of modern ground fabrics very efficient. With the use of a little budgeting, it is very easy to afford this project within your personal budget


Stage One
The photos we show in this article show a French drain being constructed behind a low retaining wall. First you need to dig a trench behind the wall about 15cm wide and as deep as required with a fall off 1 in 100 so that the water flows. Next the trench should be lined with ground sheeting this is available at most builders merchants. This sheeting allows water to pass through but not the soil particles such as silt and clay that often block drains after a number of years.


Line the drain Fill with clean stone


Stage Two
Fill the trench inside the sheeting with a clean stone, 20mm is ideal or clean broken bricks. The trench can be filled to the surface or as shown in our photo it has been filled to about 10cm below the surface and the sheeting wrapped around it. Then backfilled with topsoil.


Stage three
The drain will needed to end in a soak away. This is a large cube shaped hole lined with ground sheeting and filled with clean gravel or clean rubble. The idea is that when the drain is working the water runs into the soakaway and over a few hours soaks into the surrounding ground soil. For this reason it is best to pick an area of land that drains freely!


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Wrap the sheeting around it


End with a soak away


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