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When designing a cellular soakaway, infodrainage automatically assumes a 1m2 plan area chamber between tank soffit and exceedance level (which would have been specified as ground level). In other structures you can specify freeboard and exceedance level as two seperate quantities but this is not an option for geocellular storage.
The additional volume makes the presentation of results to Councils confusing as it appears more storage is available than there is in reality.
