Changes

Natural rock catchment and Open water reservoir

290 bytes added, 00:08, 15 January 2014

→‎Suitable conditions

* The rock that makes up the catchment should be bare and free of vegetation/soil. It should have no fractures or cracks that would result in a loss of water through seepage.

* 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)* 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.#Rock pools and rock shelves, the latter being nearly flat areas on rock outcrops, can be surrounded with two-winged or three-winged dam walls.* Other requirements: availability of materials such as sand, hardcore, and ballast locally; skilled person/mason; labour; a means of transporting materials

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

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===Resilience to changes in the environment===

Winona

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