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Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

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→‎Case Studies

* Labour: 1.5m3 per person per day manual earth movement.

==~~Case Studies~~Field experiences==

Experience from Vietnam showed that in 5 out of 7 shallow wells that were near the trenches with water tables of between 3 and 18 metres below ground level, showed an increase in water levels after rainfall events of over 60mm because of infiltration from the contour trenches. It seems that recharge of groundwater is not certain according to local sub-surface conditions – in Vietnam, water levels in 2 out of the 7 wells near the trenches were unaffected. This is probably due to certain geological layers blocking infiltration. So it is always a possibility that trenches will not affect water levels.

Winona

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