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Water Portal / Rainwater Harvesting / Groundwater recharge / Wells, shafts, and boreholes

2 bytes removed, 04:49, 5 April 2012
→‎Construction
====Construction====
* The tubewell is sited 5 – 10 meters “upstream” from a well or borehole that dries up in the dry season, or in an area of saline groundwater.
* When If taking water directly from a roof, ensure that the downpipe has a sieve on the inlet and a first flush system.
* A hole (e.g. 2”) is drilled with a step auger or a soil punch. The depth should be such that it passes the compact top layers and reaches the permeable layers – in general 4 – 6 meters is enough depending on the site.
* The recharge hole should not reach the groundwater layer aquifer to avoid contamination of the groundwater with surface water. Ideally the minimum distance should be 1.5m above the water table and 5 metres from an abstraction point such as a hand dug well. The water table can be known by observation in the hand-dug well.
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