Drainage may be to a sump or soakaway, into main soil systems or highway storm-water sewers. Drainage into main sewers is not usually permitted and most storm- water is now taken to garden soakaways, to avoid overloading stormwater services during periods of heavy rainfall.
The soakaway is eventually tapped by the water authority, as the water falls to a level or district ‘table’ where it can be pumped out and stored.
The soakaway-pit size is related to the amount of stormwater capacity of the drainage system. An average domestic-sized pit measures some 1130m:I, located about 460mm below the ground level.
This may be a rectangular pit, lined with selected clean hardcore, to disperse the water. Where the ground is soft and friable, it may be necessary to build a brick chamber or line the walls of the pit with concrete.
An alternative filling is a random honeycomb of bricks. The soakaway should be capped with a concrete lid, about 150mm below ground level.
A pipe leading from the stormwater drainage should be taken into the soakaway at about one third of depth from the top and about one third of the width in, and should maintain a slight downward fall.
10. November 2011 by admin
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