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Water Portal / Rainwater Harvesting / Groundwater recharge / Permeable rock dams

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→‎Suitable conditions

The main limitation of permeable rock dams is that they are particularly site-specific, and require

considerable quantities of loose stone as well as the provision of transport.

 

This system is generally used across relatively wide and shallow valleys. This technology is appropriate for regions with less than 700 mm annual rainfall, where gullies are being formed in productive land. This is particularly suited to valley bottoms with slopes of less than 2%, and where a local supply of stones and the means to transport them is available.

 

{{procontable | pro=

- Increased crop production and erosion control as a result of the harvesting and spreading of floodwater. <br>

- Improved land management as a result of the silting up of gullies with fertile deposits.<br>

- Enhanced groundwater recharge.

| con=

- Reduced runoff velocities and erosive potentials.<br>

- High transportation costs. <br>

- Need for large quantities of stone.

}}

==Construction, operations and maintenance==

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