Rain retention system

A rain retention system ( RRA ) is a system for storing rain or mixed water .

It can be built in earth or concrete. Advantages of earthworks are the lower construction costs and the possible natural design. The advantage of the concrete construction is the lower space requirement; the basin can also be built underground.

Usual construction methods are:

• Rainwater retention basin
• Rain retention ditch
• Rain retention channel
• Rainwater retention basin
• Rainwater canal
• Rain cyclone basin