* 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.
{{procontable | pro=
- Facilitates recharge into surrounding ground which in turn improves soil moisture <br>
- Improves agricultural productivity and grazing potential as well as increases water for livestock and therefore mitigates against drought <br> - Reduces soil erosion <br>
- Can assist recharge of shallow wells <br>
- Simple technology and maintenance <br>
- Water of good quality<br>
- Unaffected by drought <br>
| con= - Frequent fog presence is needed <br>
- Relatively small water quantities can be harvested <br>
- Polypropylene mesh is hard to find in some areas <br>
- Effects of storm damage due to site and fragility of nets if maintenance is not performed <br>
- Vandalism and lack of maintenance – due to the distance between structures and a population <br>
}}
==Construction, operations and maintenance==