Quantifies reductions in phosphorus P and TSS runoff for a given BMP or group of BMPs Can be used to determine best BMPs for a particular situation Why do we need to know these Meet regulatory requirements ID: 1007246
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1. MIDS calculatorQuantifies reductions in runoff volume for a given BMP or group of BMPsQuantifies reductions in phosphorus (P) and TSS runoff for a given BMP or group of BMPsCan be used to determine best BMP(s) for a particular situation
2. Why do we need to know these?Meet regulatory requirementsMeet water quality targetsChoose most efficient/effective BMP
3. How does it work?Calculate the amount of stormwater runoff, P, and TSS entering the BMPDifferent BMPs have removal efficiencies based on research and monitoringCalculator does a mass balance on volume, P, and TSS coming in, being removed, and returning as runoff
4. 100% TSS, PP, DP reductionOverflow volume0% TSS, Particulate P (PP), and Dissolved P (DP)reductionInfiltration BMPs100% TSS, PP, DP reductionFiltered volume60% TSS. Particulate P (PP), and Dissolved P (DP)Calculated based on mediaFiltration BMPs w/ some infiltration
5. The BMPs
6. Green RoofBioretention BasinInfiltration BasinPermeable PavementSwale Side SlopeSwale Main ChannelWet SwaleSwale With Underdrain
7. Sand FilterStormwater PondStormwater Pond w/ Filter BenchWetlandOtherOtherHarvest and ReuseImpervious Disconnect
8. Underground Infiltration
9. Examples2 acre site1 acre impervious1 acre pervious turfB soilsZip = 55105GoalsInfiltrate first 1.1 inches off impervious surfacesCapture 80 percent of Total P
10. Problem 1: Same as example but pick one of these conditionsHave to minimize surface space of the BMP½ the impervious is parking lotThe full acre of impervious is a linear roadYou are on a C soil½ the impervious is a building roof
11. Problem 210 acre site, half is pervious forest and half is imperviousImpervious: 1 acre on A soils, 2 acres on B soils, 2 on D soilsPervious acreage: same as imperviousGoal is to meet the MN Construction SW Permit – infiltrate first 1 inch off impervious surfacesHints: draw a site map; you’ll probably need or want multiple BMPs; include treatment train on your mapPick your zip code
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