MIDS calculator Quantifies reductions in runoff volume for a given BMP or group of BMPs Quantifies reductions in phosphorus (P) and TSS runoff for a given.

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Presentation transcript:

MIDS calculator Quantifies reductions in runoff volume for a given BMP or group of BMPs Quantifies reductions in phosphorus (P) and TSS runoff for a given BMP or group of BMPs Can be used to determine best BMP(s) for a particular situation

Why do we need to know these? Meet regulatory requirements Meet water quality targets Choose most efficient/effective BMP

How does it work? Calculate the amount of stormwater runoff, P, and TSS entering the BMP Different BMPs have removal efficiencies based on research and monitoring Calculator does a mass balance on volume, P, and TSS coming in, being removed, and returning as runoff

Filtration BMPs w/ some infiltration 100% TSS, PP, DP reduction Overflow volume 0% TSS, Particulate P (PP), and Dissolved P (DP) reduction Infiltration BMPs 100% TSS, PP, DP reduction Filtered volume 60% TSS. Particulate P (PP), and Dissolved P (DP) Calculated based on media Filtration BMPs w/ some infiltration

The BMPs

Green Roof Bioretention Basin Infiltration Basin Permeable Pavement Swale Side Slope Swale Main Channel Wet Swale Swale With Underdrain

Other Impervious Disconnect Harvest and Reuse Stormwater Pond Stormwater Pond w/ Filter Bench Wetland Sand Filter Other Other

Underground Infiltration

Examples 2 acre site B soils Zip = 55105 Goals 1 acre impervious 1 acre pervious turf B soils Zip = 55105 Goals Infiltrate first 1.1 inches off impervious surfaces Capture 80 percent of Total P

Problem 1: Same as example but pick one of these conditions Have to minimize surface space of the BMP ½ the impervious is parking lot The full acre of impervious is a linear road You are on a C soil ½ the impervious is a building roof

Problem 2 10 acre site, half is pervious forest and half is impervious Impervious: 1 acre on A soils, 2 acres on B soils, 2 on D soils Pervious acreage: same as impervious Goal is to meet the MN Construction SW Permit – infiltrate first 1 inch off impervious surfaces Hints: draw a site map; you’ll probably need or want multiple BMPs; include treatment train on your map Pick your zip code