Changes

Riverbed infiltration galleries

620 bytes added, 18:43, 6 April 2012

→‎Suitable conditions

* There should be water remaining in the riverbed throughout the dry season.

* Make it in a degrading river section where there is no deposition, so there are coarser grains and no silt deposits blocking flow.

 

 

{{procontable | pro=

- Allows a method of water extraction where sand depth is shallow or where sediments are fine and have low permeability <br>

- Cheap where it can be done without shuttering <br>

| con=

- Difficult to make deep enough to ensure water at all times. Laying deeper galleries involves digging deeper and preventing sand trenches from collapsing by using shuttering – this becomes a more involved and expensive process <br>

- Significant amount of work involved <br>

- Difficult to construct where riverbanks are not alluvial (where rock breaking techniques required) <br>

- Can clog up over time

}}

==Construction, operations and maintenance==

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