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Natural rock catchment and Open water reservoir

No change in size, 17:42, 5 April 2012
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[[Image:BareRockCatchment.jpg|thumb|right|350px300px|Natural rock catchment on Sullivan Rock, USA.]][[Image:RockCatchment.jpg|thumb|right|350px300px|Rock catchment project in Kitui, Kenya.]]
These are naturally occurring catchments of bare rock that have high runoff coefficients (around 0.9). Water can be stored as an open reservoir behind a retaining structure, with storage capacities ranging from 20 – 4,000 m3, or can be stored directly in a covered storage tank that collects water directly from the catchment.
==Construction, operations and maintenance==
[[Image:RockCatchmentRoof.jpg|thumb|right|350px300px|Building a roof for the rock catchment dam to keep it clean and minimise evaporation losses.]][[Image:RockPool.jpg|thumb|right|350px300px|A rock pool in near Taveta, Kenya.]][[Image:MeasureRockGradient.jpg|thumb|right|350px300px|To measure the rock gradient, a spirit-level horizontal on a 100cm length of timber is used. This rock is determined to be too steep.]]
In general, it seems that smaller scale dams owned privately might have more chance of success in terms of participation in the construction
and maintenance processes.
Winona
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