Are you tired of poor drainage in your garden? If you have a high seasonal water table, you may find that water sits on or close to the surface during periods of heavy rainfall. If the structure of soil in your lawn is heavy, this too can reduce soil
permeability and lead to poor drainage. Low points in the garden, also allow water to collect and drain poorly. Walking on a poorly drained lawn when it is wet can further add to your problems as wet soil compacts and loses its structure. So what do you do?
There are various ways to manage your lawn drainage. Two such drainage techniques are mentioned below -
Single pipe drainage -
A plastic pipe 10ft in length and 4ins in diameter should be bought for land drainage. It can be joined using some
straight coupling pieces and can be easily sawn to its length. The pipe has to be perforated to allow water entering. Cut out the turfs and put them to one side - stack the topsoil on a sheet of polythene for avoiding damage to the lawn.
Lay the pipe in
the trench, about 1-2ft deep, with the holes facing downwards. This will stop the soil and small stones from getting in the pipe, but will let the water enter. Feed this pipe work to a soak-away at the lowest point, so the water can easily drain away. The
soak-away can be a very simple affair that is a hole dug out 3ft deep x2ft x 2ft. Put brick rubble and stones in the bottom for a depth of about 2ft. Then place 6 layer of pea shingle or coarse sand and to finish add a layer of topsoil. End the pipe in the
center of the soak-away.
Herringbone drainage -
Another method of lawn drainage is herringbone drainage. But, it can work out to be quite expensive. Thus, it is only necessary if the lawn is waterlogged over the whole area. Then, using a line,
first mark out the main drainpipe from the highest to the lowest part of the lawn. Mark the side drains that connect to the main pipe, to form a herringbone pattern. The side drains should join the main pipe at a 45-degree angle.
Now, remove the turf
carefully and place it onto one side. Later, dig out the main and side trenches about 1ft wide and to a depth of 2 ft 6ins to 3 ft depending on the type of soil, to accommodate drainage pipes. Lay the pipes on a bed of pea shingle and cover them completely with pea shingle.
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