Choose the Right Rain Garden - Next Step

Rain garden sized to drain in time for next storm?

 

Yes    |     No     |     Start Over

 

Whether or not a facility will empty out and be ready for the next storm is a function of the storm distribution (i.e. Type IA, Type I, and Type II). Type IA is the most gentle, longest storm while Type II storms are the shorter, most intense storms. In general, jurisdictions within the Type IA distribution in Oregon require facilities to be empty in 30 hours. 

To determine the answer to this question, you or your designer probably need to model the rain garden. You can use popular engineering modeling software such as EPA SWMM or HydroCAD or OSU’s open-source Excel calculator. Video tutorials are available at this link.

 

Whether or not a facility will empty out and be ready for the next storm is a function of the storm distribution (i.e. Type IA, Type I, and Type II). Type IA is the most gentle, longest storm while Type II storms are the shorter, most intense storms. In general, jurisdictions within the Type IA distribution in Oregon require facilities to be empty in 30 hours. 

To determine the answer to this question, you or your designer probably need to model the rain garden. You can use popular engineer model software such as EPA SWMM or HydroCAD or OSU’s open-source Excel calculator . Tutorials in PowerPoint and video are available at this link.

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