Changes

Natural rock catchment and Open water reservoir

173 bytes added, 23:33, 16 July 2012

→‎Suitable conditions

{{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - High runoff coefficient is similar to roof catchments, even small showers produce water <br>

- Minimal seepage <br>

- Maintenance is simple and cheap <br>

- Rock catchments do not occupy farmland and often no one owns the land, so it easy to implement<br>

- People have been used to draw water from rock catchments since the first structures were built in the middle of the 1950s<br>

| convalign= "top" | - Not many sites suitable <br>

- If building tanks that store water directly, storage capacity is limited compared to an open reservoir<br>

- Cost is potentially high – in Kenya a 56 m3 dam cost $4,000 including labour (= $71 per m3 of storage) <br>

- Microbiological and chemical water quality is likely to not be acceptable for direct consumption<br>

- Tanks and masonry dams provide domestic water, but are not capable of supplying water for livestock or irrigation due to their high demands.

}|}

==Resilience to changes in the environment==

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