Difference between revisions of "Minnesota Stormwater Manual test page 5"
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{{alert|This page is an edit and testing page use by the wiki authors. It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}} | {{alert|This page is an edit and testing page use by the wiki authors. It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}} | ||
| + | =Header= | ||
| + | [[Default TSS and TP loads using the MPCA Simple Estimator]] | ||
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| + | The objective of this analysis was to provide estimates of annual loads of total phosphorus (TP) and total suspended solids (TSS), in pounds per acre, from stormwater runoff in Minnesota cities. The results represent estimated loads with no implemented best management practices (BMPs). | ||
| + | |||
| + | ==Analysis== | ||
| + | We used the [https://stormwater.pca.state.mn.us/index.php?title=Guidance_and_examples_for_using_the_MPCA_Estimator MPCA Simple Estimator] (Estimator) to calculate average annual loading, in pounds per acre, for total phosphorus (TP) and total suspended solids (TSS). We used the default values in the Estimator for event mean concentration and runoff coefficient and assumed an annual average precipitation of 30.65 inches (Twin Cities Metro Area (TCMA)). These values are discussed in the Minnesota Stormwater Manual, as well as guidance for the MPCA Simple Estimator. Appropriate links include the following. | ||
| + | *Event mean concentrations for [https://stormwater.pca.state.mn.us/index.php?title=Event_mean_concentrations_of_total_and_dissolved_phosphorus_in_stormwater_runoff total phosphorus] and [https://stormwater.pca.state.mn.us/index.php?title=Event_mean_concentrations_of_total_suspended_solids_in_stormwater_runoff total suspended solids] | ||
| + | *[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_runoff_coefficients/curve_numbers_for_different_land_uses Runoff coefficients] | ||
| + | *[https://stormwater.pca.state.mn.us/index.php?title=Guidance_and_examples_for_using_the_MPCA_Estimator Guidance for the MPCA Simple Estimator] | ||
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| + | We gathered land use data for several TCMA cities using [https://lphonline.metc.state.mn.us/commportal Metropolitan Council land use data]. The land use categories for the Met Council data do not match those used in the Estimator, so we converted the Met Council data into land uses used in the Estimator. These are summarized in the following table. Because this is subjective, we include a column describing the relative significance of a specific land use to total acres in a city. For example, farmstead was assigned to agricultural land use. Farmsteads may not be associated with typical agricultural practices, but farmstead is a minor land use and therefore has a minor impact on overall pollutant loading. | ||
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| + | [[Met Council and Manual land use categories]] | ||
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| + | <!-- | ||
=[[Green Stormwater Infrastructure (GSI) and sustainable stormwater management]]= | =[[Green Stormwater Infrastructure (GSI) and sustainable stormwater management]]= | ||
[[File:Native landscaping.jpg|thumb|300px|alt=photo of a rain garden planted with native vegetation|<font size=3>Example of a rain garden planted with native vegetation. In addition to providing stormwater treatment, bioretention practices can provide other benefits such as habitat and aesthetic value.</font size>]] | [[File:Native landscaping.jpg|thumb|300px|alt=photo of a rain garden planted with native vegetation|<font size=3>Example of a rain garden planted with native vegetation. In addition to providing stormwater treatment, bioretention practices can provide other benefits such as habitat and aesthetic value.</font size>]] | ||
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*[[Stormwater runoff performance of natural and undeveloped systems]] - <span title="This page addresses LTech issue 5."> '''Comment'''</span> | *[[Stormwater runoff performance of natural and undeveloped systems]] - <span title="This page addresses LTech issue 5."> '''Comment'''</span> | ||
*[[Checklists, inspection sheets, maintenance agreements, and model ordinances for green stormwater infrastructure]] - <span title="A repository for these materials. The materials likely reside on individual pages and this page provides links to those individual pages."> '''Comment'''</span> | *[[Checklists, inspection sheets, maintenance agreements, and model ordinances for green stormwater infrastructure]] - <span title="A repository for these materials. The materials likely reside on individual pages and this page provides links to those individual pages."> '''Comment'''</span> | ||
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Revision as of 14:31, 2 February 2021
Header
Default TSS and TP loads using the MPCA Simple Estimator
The objective of this analysis was to provide estimates of annual loads of total phosphorus (TP) and total suspended solids (TSS), in pounds per acre, from stormwater runoff in Minnesota cities. The results represent estimated loads with no implemented best management practices (BMPs).
Analysis
We used the MPCA Simple Estimator (Estimator) to calculate average annual loading, in pounds per acre, for total phosphorus (TP) and total suspended solids (TSS). We used the default values in the Estimator for event mean concentration and runoff coefficient and assumed an annual average precipitation of 30.65 inches (Twin Cities Metro Area (TCMA)). These values are discussed in the Minnesota Stormwater Manual, as well as guidance for the MPCA Simple Estimator. Appropriate links include the following.
- Event mean concentrations for total phosphorus and total suspended solids
- Runoff coefficients
- Guidance for the MPCA Simple Estimator
We gathered land use data for several TCMA cities using Metropolitan Council land use data. The land use categories for the Met Council data do not match those used in the Estimator, so we converted the Met Council data into land uses used in the Estimator. These are summarized in the following table. Because this is subjective, we include a column describing the relative significance of a specific land use to total acres in a city. For example, farmstead was assigned to agricultural land use. Farmsteads may not be associated with typical agricultural practices, but farmstead is a minor land use and therefore has a minor impact on overall pollutant loading.
Met Council and Manual land use categories