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Natural rock catchment and Open water reservoir

225 bytes added, 00:12, 15 January 2014
→‎Suitable conditions
===Suitable conditions===
* The rock that makes up the catchment should be bare and free of vegetation/soil. It should have no fractures , cracks, or cracks soil pockets that would result in a loss of water through seepage.* The dam should be built in a site that has a high depth to surface ratio (it is more deep than it is wide) so as to minimize evaporation losses.
* Site the dams for rock catchments to maximize the natural topography – to get the best storage volume, build on gorges between rocks, rock pools, and rock shelves. Make dams on the lower side of existing rock pools.
* Catchment may be enclosed by stone gutters (a stone wall built with rough stone/hardcore, joined with mortar)
* There should be no severe soil erosion in the catchment area
* Masonry dams (gravity or pumped) are more site-specific than tanks and earth dams because:<br>
# Gorges between two rocks can be closed with a straight dam wall.
Winona
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