Changes

Natural or artificial ground catchment and Lined sub-surface tanks

384 bytes removed, 00:43, 6 April 2012

→‎Suitable conditions

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- Sub-surface tanks often cannot hold enough water for the whole dry season; making bigger berkeds is possible but is more difficult and expensive; if not affordable it is not replicable.<br>

- Costs currently limit the replicability of the technology for poorer families and the potential to scale things up; the cost of underground tanks can be high and variable in cost per m3 of storage (averages around $30-40 per m3 of storage or more depending); sub-surface hemispherical tanks made from stone masonry and bricks/cement in Ethiopia costs 113 - 219 Euro per m3 of storage including all costs; may need to pay for trucked water for construction and for a higher solidity of tanks (clay) <br>

- Considerable amounts of silt accumulate in tanks, exactly how much will depend on the area <br>

- Flotation of the tank may occur in areas with a high groundwater table <br>

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