Rain Garden Overflow Design
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Design modified soils usually have underdrains.
Rain garden overflow design. Important to create storage capacity in rain gardens overflow drainage must be carefully constructed so level of the overflow match those specified in the construction plans. Ground surface level but above the top level of the rain garden. An overflow spillway is a small indentation in the berm of a rain garden that serves as the point where excess water will flow out of the garden should it overfill during a major rain storm.
The overflow path between the rain garden overflow point and the nearest downslope property line overflow from large storms needs enough space to spread out before leaving the property steep slopes 10 feet between any edge of the rain garden and an abrupt change from a gentle yard slope to a steep slope approximately 15 or more. Overflow pipes should be fitted with grates or screens to prevent clogging of pipes with litter or debris. The overflow is the location where water is released from the rain garden when there is a significant rainfall event and the rain garden cannot hold all of the runoff.
The overflow device can be as simple as a berm. Adjacent to rain garden to act as overflow when runoff volume exceeds rain garden capacity.
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