Available in capacities from 2800-110000 litres in multiple configurations with tank sizes ranging from Ø1.2m to Ø3m diameters, the Storm Dammer – stormwater attenuation tank – alleviates the risk of flooding and reduces pressure on drains/sewers by storing the excess flow of stormwater before controlled discharge downstream.

Greater capacity, ease of inspection and maintenance make Storm Dammer the industry choice for developers, municipal planners and civil engineers.

Configuration and components are shown for illustration purposes only

Underground stormwater attenuation tanks allow for high volume storage of runoff in a small footprint area.

The tank is typically buried under a car park or other open land on the site. In the latter case this underground tank may be preferable to a surface detention pond if other uses are intended for the land (eg, a pedestrian area or park). In other situations a tank is used because installing a pond might pose other problems, such as attracting unwanted waterfowl or other animals. In some sites a tank may be installed in the basement of a building, such as a parking garage.

The outlet is generally a restricted-flow drain from the retention tank, with a weir for containing detritus.

Attenuation tanks delay water’s delivery downstream, and possibly creates a later water level peak post-rainfall. It is important to consider timing of water release and the types of reservoirs feeding a waterway.