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Natural or artificial ground catchment and Lined sub-surface tanks

33 bytes added, 15:01, 6 April 2012

→‎Limiting evaporation

Another method to reduce evaporation and at the same time improve water quality is to use a lined, sand-filled tank. It appears that plastic pond liners are in general more tolerant to earth tremors than solid lining like concrete – in some situations when the rains might cause swelling of the surrounding ground which might move the existing wall in a similar way, the plastic lining might in fact still be functional. In such a case it might be good to try out the following method which has been tried in Botswana in a lined rectangular tank:

* Use a plastic lining to create an impermeable layer on top of the existing lining. Protect the lining with a sand layer both on the floor of the berked before the lining is laid (evens out floor, protects against sharp objects, dried clay fragments etc), and also on top of the plastic after it is laid (to protect from flotsam and when people walk on it).

* Create an abstraction point(using sand to filter the water).

* Fill the remaining volume with sand.

* Add a coarse mesh after the silt trap before inlet to prevent large debris from entering the tank.

Winona

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