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Riverbed hand-dug wells

1,070 bytes added, 00:12, 21 April 2012
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==Suitable conditions==
{{Climate_change
|heading1=Drought
|text1= - ''Effects of drought'': Can dry up. <br> - ''Underlying causes of effects'': Less recharge of aquifer due to less rainfall; Increasing population & water demand; Size of aquifers – e.g. limited sand volume; Wells not sunk deep enough into water table; Incorrect siting; Graded gravel around pipe not correctly done. <br> - ''To increase resiliency of WASH system'': Increase volume through construction of groundwater dam; Sink wells/pipes deeper; De-water wells during caissoning within the water table; Construct during the latter half of the dry season; Site in riverbeds that are dry for part of the year, where water remains in the riverbed throughout the dry season; Increase flow by use of porous concrete & perforated pointed steel pipes driven horizontally into the aquifer (riverbed wells) and graded gravel (infiltration galleries & jetted wells); Site in a degrading river section where there is no deposition (infiltration galleries); Put graded gravel around pipes to minimize clogging and increase flow.}}
 
* Wells need to be sited in riverbeds that are dry for part of the year, allowing construction to take place.
* There should be water remaining in the riverbed throughout the dry season.
Winona
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