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Water Portal / Rainwater Harvesting / Groundwater recharge / Sand dam

177 bytes added, 21:57, 30 March 2012

→‎Building the sand dam (and wing wall)

* In upstream parts of a catchment it is recommended that sand dams are always built in stages, since the availability of coarse material is generally limited and base flow is small or absent (base flow = sub-surface flow which aids surface flow so that silt/clay can still be flushed away once rainfall stops, rather than sinking directly into the sand bed). It has also been suggested that to build in stages over several years is also more beneficial for functioning of dam committees. Build them within a spillway, which was part of the first stage & wing wall construction.

After the dam is built, an outlet for water extraction must be constructed for drinking, agriculture, etc.. Hand dug scoop holes are the simplest possibility, however the water can easily be contaminated. Covered wells, with hand or rope pumps protect the water much better. It is also possible to construct an outlet pipe with a tap. This however In certain designs for sand dams, a pipe is difficult shown that takes water by gravity through the dam wall. These are said to maintainnot work well due to either a blocked intake, a broken tap on outlet side and can weaken the possibility of weakening the damwall. Meanwhile the local community needs to be trained to manage and maintain the dam.

[[Image:Sand dam scoop hole.JPG|thumb|right|200px|Women fetching water from a local aquifer through scoop hole]]

[[Image:Sand dam well.JPG|thumb|right|200px|Closed well near a sand dam]]

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