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Riverbed infiltration galleries

504 bytes added, 00:20, 18 April 2012
→‎Construction, operations and maintenance
#There is less chance that the well shaft and pipework will be washed away in a flood event. Sand becomes mobile to a certain depth which differs for different rivers but has been recorded to be normally between 0.66 and 2 metres in seasonal riverbeds.
* Graded gravel needs to be placed under and over the pipe to minimize clogging with sediments.
 
====Water extraction====
* Water from infiltration galleries runs to collector wells from where it can be abstracted with [[Handpumps]] or [[Small and efficient motor pumps]]. The collector well is a hand-dug well which acts as a waterproof chamber – it is dug deeper than the infiltration gallery to allow water to enter by gravity and to allow enough storage volume.
* A bucket and rope can be used but risk of contamination increases. In such a case, household water treatment should be advocated.
==Costs==
Winona
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