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Overflow elevation
===Overflow elevation===
The invert of the overflow should be placed at the maximum water surface elevation of the practice. i.e. the maximum ponding depth. A good starting point is around 300 mm over the surface of the practice. However, consideration should be given to public safety and drainage time|time for the ponded water to drain. See [[Bioretention: Sizing#Additional step for system without underdrain|Bioretention]] and [[Stormwater planters]] Where temporary ponded water is being planned for, include a [[freeboard]] to reduce the chance of localised flooding.

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