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→Overflow elevation
===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.
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.
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 for the ponded water to drain.
See [[Bioretention: Sizing#Additional step for system without underdrain|Bioretention]] and [[Stormwater planters]]
See [[Bioretention: Sizing#Additional step for system without underdrain|Bioretention]] and [[Stormwater planters]]