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Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

266 bytes added, 23:41, 28 March 2012

→‎Suitable conditions

- Can reduce salinity in groundwater <br>

- Gully plugs: no trench design required, just uses existing gully drainage pattern <br>

| con= - Recharge of groundwater is not certain according to local sub-surface conditions (geological layers blocking infiltration) <br>- Relatively small water quantities can be harvested Trenches silt up and will need maintenance <br>- Polypropylene mesh is hard Lack of understanding by landowners about advantages of contour trenches; difficult to convince them during the first year to find in some areas give their land for trench construction <br>- Can increase land fragmentation <br>- Effects of storm damage due to site Costly and fragility in-depth analysis of nets if maintenance is not performed hydrology/runoff gullies <br>- Vandalism and lack of maintenance – due Recharge capacity/permeability information is needed, which is difficult to the distance between structures and a population get if no in-depth rainfall data is available <br>- Expensive cost of implementation where mechanical excavating machinery is used

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