The capacity of storm water systems did not keep up with the rapid expansion of office parks, townhouse developments, industrial parks, large warehouse, etc. It it is therefore necessary to design and construct attenuation ponds to store the water during the times of peak flow from heavy rain storms and slowly releasing it into the storm water system in a controlled manner preventing floods.
Storm water channels contain water, prevent erosion and direct it to storm water systems,wetlands or rivers. These could be earth line if the flows velocity is not very high that could cause erosion. In build up areas storm water channels must accommodate high volumes at high velocities. Natural lined channels will erode under these circumstances. There are various options to line storm water channels. Cast in situ concrete, precast concrete retaining blocks, gabion baskets and mattresses or a combination between different products.