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Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

1 byte removed, 11:56, 29 May 2012

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==Suitable conditions==

~~{{Climate_change~~

~~|heading1= Drought~~

|text1='''Effects of drought''': Lower crop yields. <br>'''Underlying causes of effects''': Water levels reduce; Less recharge to aquifers & crops. <br> '''To increase resiliency of WASH system''': Diversify livelihoods of farmers.

~~|heading2= Floods~~

|text2= Contour trenches specifically help control flooding and capture water from floods. If rain event is expected to be massive, plant vegetation along the outer edge of the contour to stabilise the trenches and prevent erosion.

}}

* Locate trenches in natural runoff areas, but not on slopes over 10%.

* Soil in vicinity needs to have sufficient infiltration capacity and potential sub-surface storage capacity.

- Expensive cost of implementation where mechanical excavating machinery is used

}}

==Resilience to changes in the environment==

====Drought====

'''Effects of drought''': Lower crop yields.

'''Underlying causes of effects''': Water levels reduce; Less recharge to aquifers & crops.

'''To increase resiliency of WASH system''': Diversify livelihoods of farmers.

====Floods====

Contour trenches specifically help control flooding and capture water from floods. If rain event is expected to be massive, plant vegetation along the outer edge of the contour to stabilise the trenches and prevent erosion.

==Construction, operations and maintenance==

Marktielewestra

Akvopedia-spade, administrator

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