Changes

Riverbed infiltration galleries

208 bytes added, 00:24, 17 July 2012

→‎Suitable conditions

{{procontable | pro=

 | con=  }} {| border="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - 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>

| convalign= "top" | - 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

}|}

==Resilience to changes in the environment==

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