Where Would the Overflow from a Rainwater Harvesting Tank go to?

Posted by Callum Vallance-Poole, on July 10, 2024.

The overflow from a rainwater harvesting tank can be directed to different places depending on the situation. The two primary options are a soakaway or a storm drain. If the soil has good permeability and there is enough space available, it’s preferable to discharge to a soakaway. However, if the ground conditions are poor or there is no suitable percolation rate, the overflow can be directed to a storm drain.

Graf systems offer specific filters based on the discharge destination. For a soakaway, a basket filter is used to retain leaves and debris. For a storm drain or alternative option, a self-cleaning filter is used to wash the water over the top and prevent leaves and debris from entering the soakaway. The choice of filter depends on the specific discharge destination.


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