Changes

Natural or artificial ground catchment and Lined sub-surface tanks

2 bytes removed, 23:49, 5 April 2012

→‎Limiting evaporation

* Fill the remaining volume with sand.

* In case of cracked linings, the following could be tried to salvage the tanks:

##If the crack is only at the base, covering the tank base with clay and compacting it might work. Addition of powdered anthills or lime is said to make this lining more robust. If the cracks are also found in the walls, then rehabilitation or an alternative lining might be a solution. Taking the example of berkeds in Somaliland, many remain unused due to previous poor workmanship, yet rehabilitation is expensive ($8 per m3), requires skill and is not always successful. In some cases it is also not even possible to rehabilitate – some cracked berkeds can be rehabilitated if the original walls were made solidly enough, but otherwise there are many berkeds that can never be rehabilitated. In such cases, plastic linings might be worth trying.

==Costs==

Winona

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