Attenuation controls the speed of water as it goes back to the water table - valuable if tackling flooding and an overwhelmed infrastructure. Attenuation consists of the temporary storage of surface water in a suitable chamber below ground level. This chamber needs to be of sufficient size to accommodate the calculated run-off during peak periods of rainfall. The stored water is then gradually released in a controlled manner into a surface water or combined drainage system or watercourse, subsequently eliminating the risk of flooding downstream.

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