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Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

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==Construction, operations and maintenance==

[[Image:Contour_Trench.JPG|thumb|right|350px300px|An example of contour trench in Kitenden, Vietnam. <br> Source: Westerveld Conservation Trust]]

In order to efficiently capture runoff in a catchment through appropriately sized trenches, the following information and analysis is needed:

* Catchment area, gathered from topographical maps

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