Rain gardens are an effective means to control stormwater. The current state of practice only allows designers to calculate storage based upon the volume of the bowl and possibly the void space of the soil in Pennsylvania. Infiltration and evapotranspiration (ET) remain unaccounted for in design. Other design components, such as depth and soil type, are often restrictive and vague. In addition, current research demonstrates the importance of ET in vegetated stormwater control measures (SCMs), however, the soil mix guidelines heavily favor infiltration. Establishing soil mix guidelines that consider both infiltration and ET will enable greater creativity in SCM design and flexibility in siting SCMs.
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