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==MPCA Simple Estimator quick guide== | ==MPCA Simple Estimator quick guide== | ||
+ | [[File:Estimator 2.png|500px|thumb|alt=screen shot of simple estimator]] | ||
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The [https://stormwater.pca.state.mn.us/index.php?title=MPCA_Simple_Estimator MPCA Simple Estimator] is a spreadsheet-based tool used to predict watershed-based loading for total phosphorus (TP) and total suspended solids (TSS), and estimate pollutant removal at water quality best management practices (BMPs). | The [https://stormwater.pca.state.mn.us/index.php?title=MPCA_Simple_Estimator MPCA Simple Estimator] is a spreadsheet-based tool used to predict watershed-based loading for total phosphorus (TP) and total suspended solids (TSS), and estimate pollutant removal at water quality best management practices (BMPs). | ||
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+ | ===Applicability=== | ||
+ | *The MPCA Simple Estimator reports on an annualized-basis, and is therefore not suitable for evaluating WLA compliance for non-annualized WLAs. | ||
+ | *The MPCA Simple Estimator is an empirical model which has limited ability to model pollutant removal through BMPs in series and bypass from undersized BMPs. For this reason, the MPCA Simple Estimator should only be used to demonstrate WLA compliance for simplified study areas where the impact of pollutant removal through BMPs in series and bypass from undersized BMPs in considered minimal. | ||
+ | *The MPCA Simple Estimator is not capable of identifying and/or distinguishing unique removal rates for individual BMPs that may be undersized or would not otherwise meet BMP design criteria. |
This page provides a list of considerations when using models to meet MS4 (Municipal Separate Storm Sewer System) total maximum daily load permit requirements. For detailed guidance or additional information, see the links section for each model.
The Minimal Impact Design Standards calculator is a moderately simple tool for estimating pollutant load reductions associated with best management practices (BMPs).
The MIDS calculator has a Site informationtab for site information and a Schematics'' tab for inputting information for individual BMPs.
The Results tab displays summary information for the site and for each BMP.
The following table summarizes a QAQC list for interpreting results.
General MIDS Calculator result QAQC list
Link to this table
QAQC / Review Item | Related MIDS Calculator Output |
---|---|
Review device routing | Review routing in "Schematic" window |
Confirm area routed to individual BMPs is correct | BMP Properties --> Watershed |
Confirm total watershed area is correct | Review "Site Information" window |
Confirm annual precipitation total is correct | Review zip code in "Site Information" window |
Review watershed pollutant concentrations | Compare watershed areal loading to literature values |
Review TSS/TP removal rates | Compare pollutant removal values to literature values |
Confirm no routing between non-volume reduction BMPs | Removal estimates for non-volume reduction BMPs in series are incorrect. For this reason, routing between non-volume reduction BMPs should be disconnected |
Review BMP sizing recommendations and review contributing watershed area | Bypass from undersized BMPs is not calculated for non-volume reduction BMPs. For this reason, only the area for which the BMP is correctly-sized should be modeled to the BMP (the remainder should be modeled as untreated) |
The MPCA Simple Estimator is a spreadsheet-based tool used to predict watershed-based loading for total phosphorus (TP) and total suspended solids (TSS), and estimate pollutant removal at water quality best management practices (BMPs).