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Natural ground catchment and Open water reservoir

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[[Image:BareRockCatchment.jpg|thumb|right|300px|Water catchment area on Sullivan Rock, USA.]]

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.

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