![]() ![]() Note that the void ratio of the tank must be taken into account when designing the storage.Ĭheck out our detailed guidance for Attenuation Design. Then a tank of appropriate dimensions can be designed to store the water while it is slowly discharged. ![]() The design outflow from the system is then used to determine the maximum water storage volume required. The quantity of rainfall must be calculated for rain events of different durations to determine the worst case design storm. This is common when discharging from a large site to a small outfall or public sewer. These systems are required where there is a limitation to the quantity of rainwater which can be discharged from a site. Attenuation systems are large storage facilities included in a drainage system so that rainfall from storm events can be stored onsite and slowly discharged instead of discharging the whole storm event as it happens. ![]()
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