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Requirements, recommendations and information for using bioretention BMPs in the MIDS calculator
Revision as of 16:24, 6 May 2013 by
Mtrojan
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Requirements, recommendations and information for using bioretention BMPs in the MIDS calculator
Required
3 foot separation from the bottom of the bioretention system to seasonal high water table
Use most restrictive infiltration rate within 3 feet of the bottom of the BMP
Drawdown time of 24 hours for trout streams
For measured infiltration rates, apply a safety factor of 2 (2.5 for permeable pavement)
Pretreatment
Recommend
5 acre or less for contributing area
Maximum ponding depth of 18 inches, reduced to 6 inches if there is no site information (4 feet for infiltration basin)
Field tested infiltration rates over table values
Information – provide links to the following*Guidance on determining infiltration rates
Information site constraints (shallow soil, karst, etc.)
Information on assessing BMPs
Information on design metrics (high flow bypass, ponding depths, drawn down)
Guidance on pretreatment
Information on soil mixes
Plant information, including species list that show water tolerance, potential effects of different species on infiltration rates, planting guidance
Construction specifications
Information on operation and maintenance
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