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Natural ground catchment and Open water reservoir

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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. ==Suitable conditions== ==Construction, operations and maintenance== ==Costs== ==Field Experiences== ==Reference manuals, videos, and links==* [http://www.ehow.com/how_6713156_calculate-runoff-coefficient.html How to Calculate Runoff Coefficient].

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