Attenuation
Attenuation refers to the temporary storage and then discharge of stormwater to avoid flooding. Rainwater is collected from properties where it feeds into a system that has been designed to collect excess rainwater for controlled release into stormwater drains. Excess water can be held over longer periods so the possibility of flooding in vulnerable downstream areas is therefore reduced or avoided.
Attenuation looks to bring about a reduction in the force of stormwater by carefully controlling the flow. The slow rate of discharge avoids downstream flooding and the erosion of waterways due to heavy flows.
Components needed for your complete attenuation system include silt trap or catchpit chamber as a prefilter, soakaway crates for stormwater storage, impermeable membrane with protection fleece (this can either come as individual components so that you can wrap the tank yourself or in two pieces as a pre-fabricated shoebox kit) and finally a flow control unit such as an orifice chamber.
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