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Natural ground catchment and Open water reservoir

6 bytes added, 00:00, 18 April 2012

→‎Water extraction and treatment

====Water extraction and treatment====

For open water catchments, like from rock surfaces or water stored behind earth dams, direct abstraction (pump or pipe taking water off) works well. Abstraction method should minimize disturbance of the settled water, thus reducing treatment requirements later.

* Direct abstraction is one option, via a bank-mounted pump ([[Small and efficient motor pumps]] or [[Handpumps]]) which uses a floating intake to reduce sediment intake. An outlet pipe and strainer through the dam wall to the downstream side is another option, but these have potential problems of weakening the dam wall. In addition, piping will have to be secured externally when traversing rocks, so care has to be taken to secure pipes with anchor posts.

* With preventive methods to reduce turbidity (silt trap, extraction method) the water is still turbid & contaminated and will require treatment.

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