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Minnesota Stormwater Manual

Difference between revisions of "Total Maximum Daily Loads (TMDLs)"

 
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A total maximum daily load (TMDL) is the amount of pollutant loading that can occur and have a water body meet water quality standards. A TMDL may be written as an equation which allocates pollutant loading to four separate categories:
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Total Maximum Daily Loads (TMDLs) are EPA approved amounts of pollutant loading that can occur and have a water body meet water quality standards. This page is collection of links and resources to better understand, and meet, TMDL requirements.
  
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TMDL = WLA + LA + MOS + RC
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[[file:Riverconfluence.jpg|300 px|thumb|alt=image of Miss  and St Croix rivers confluence|<font size=3>Confluence of the St. Croix and Mississippi rivers. Note the St. Croix River is not impaired for sediment, while the Mississippi River is impaired.]]</font size>
  
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where WLA is wasteload allocation, LA is load allocation, MOS is margin of safety, and RC is reserve capacity. WLA includes pollutant loading from sources covered by a NPDES permit (often called point sources), LA includes sources not covered by a NPDES permit (often called nonpoint sources), MOS accounts for uncertainty in the estimates of WLA and LA, and RC allows for future growth.
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==TMDL MS4 permit guidance==
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*[https://stormwater.pca.state.mn.us/index.php?title=Additional_resources_for_completing_the_TMDL_form#Link_to_TMDL_GIS_Shapefiles NEW! Updated TMDL GIS shapefiles!]
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*[[Guidance for completing the TMDL reporting form]]
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*[[Phase I MS4 Guidance for completing the TMDL Annual report form]]
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*[[Forms, guidance, and resources for completing the TMDL annual report form]]
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*[[Summary of TMDL requirements in stormwater permits]]
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*[[Guidance for meeting chloride TMDL MS4 permit requirements]]
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*[[Guidance for meeting bacteria TMDL MS4 permit requirements]]
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*[[Guidance for meeting dissolved oxygen or oxygen demand TMDL MS4 permit requirements]]
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*[[Guidance for meeting temperature TMDL MS4 permit requirements]]
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*[[Guidance for categorical TMDLs]]
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*[[List of Approved TMDLs with MS4 WLAs]]
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*[[Guidance for completing the MS4 Permit TMDL Application Form]]
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*[[MS4 webinars and videos]]
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*[[Baseline year]]
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*[[Interpreting wasteload allocations based on flow/load duration curves]]
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*[[Information about the 2019 Legislation and affected MS4s]]
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==TMDL toolkit for MS4 permit compliance==
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[[File:Quick guide.png|200px|thumb|alt=image|<font size=3>[https://stormwater.pca.state.mn.us/index.php?title=Quick_guides_for_using_models_to_meet_MS4_TMDL_permit_requirements Access a quick guide] for using models to meet MS4 TMDL requirements</font size>]]
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*[[Overview of models used to meet MS4 TMDL permit requirements]]
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*'''P8'''
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**[[Recommendations and guidance for utilizing P8 to meet TMDL permit requirements]]
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**[[Case study for using P8 to meet TMDL permit requirements]]
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**U of MN P8 training on the use of the P8 software. P8 is a free software package for modeling stormwater pollutant management in urban watersheds.  For more information on training, [https://erosion.umn.edu/courses-registration/ed8001-using-p8-software-model go to this link].
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*'''WINSLAMM'''
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**[[Recommendations and guidance for utilizing WINSLAMM to meet TMDL permit requirements]]
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**[[Case study for using WINSLAMM to meet TMDL permit requirements]]
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*'''MIDS (Minimal Impact Design Standards calculator)'''
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**[[Recommendations and guidance for utilizing the MIDS calculator to meet TMDL permit requirements]]
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**[[MIDS calculator]]
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**[[Case study for using the MIDS calculator to meet TMDL permit requirements]]
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*'''MPCA Simple Estimator'''
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**[[Recommendations and guidance for utilizing the MPCA Simple Estimator to meet TMDL permit requirements]]
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**[[Guidance and examples for using the MPCA Estimator]]
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**[[Case study for using the MPCA Simple Estimator to meet TMDL permit requirements]]
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**[[MPCA review of submittals using the MPCA Simple Estimator]]
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**[[Default TSS and TP loads for different land use scenarios using the MPCA Simple Estimator]]
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*'''Monitoring'''
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**[[Recommendations and guidance for utilizing monitoring to meet TMDL permit requirements]]
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**[[Recommendations and guidance for utilizing lake monitoring to meet TMDL permit requirements]]
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**[[Recommendations and guidance for utilizing stream monitoring to meet TMDL permit requirements]]
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**[[Recommendations and guidance for utilizing major stormwater outfall monitoring to meet TMDL permit requirements]]
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**[[Recommendations and guidance for utilizing stormwater best management practice monitoring to meet TMDL permit requirements]]
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*[[Quick guides for using models to meet MS4 TMDL permit requirements]]
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*[[Case studies for monitoring to meet TMDL permit requirements]]
  
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==TMDL guidance and general information==
 
*[[Overview of TMDLs]]
 
*[[Overview of TMDLs]]
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*[[Summary of TMDL requirements in stormwater permits]]
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<!--
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*[[Forms and guidance for TMDLs]]
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*[[http://www.pca.state.mn.us/index.php/view-document.html?gid=19465 Addressing TMDL Requirements in MS4 General Permit Applications and Stormwater Pollution Prevention Program Documents]]
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-->
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<!--
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*[[http://www.pca.state.mn.us/index.php/view-document.html?gid=19456 List of approved TMDLs with MS4 Wasteload Allocations]]
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-->
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*[[Technical guidance used by MPCA to develop guidelines for setting TMDL WLAs for regulated stormwater]]
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*[[Guidance on what discharges should be included in the TMDL wasteload allocation for MS4 stormwater]]
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*[[Construction activity by county]]
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*Training modules
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**Overview of Stormwater Effects on Water Quality - [[File:Wq-strm7-81.pdf]]
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**Construction, Industrial & Municipal Stormwater Permits & SWPPPs - [[File:Wq-strm7-82.pdf]]
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**The TMDL Process as it Relates to Stormwater - [[File:Wq-strm7-83a.pdf]]
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**TMDL Stormwater Language - [[File:Wq-strm7-84a.pdf]]
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**Setting Wasteload Allocations in a TMDL - [[File:Wq-strm7-84b.pdf]]
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**Meeting Requirements of a TMDL - [[File:Wq-strm7-85a.pdf]]
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==Information received from MS4 permittees==
 
*[[Summary of data received from permittees on MS4 TMDL permit reporting forms]]
 
*[[Summary of data received from permittees on MS4 TMDL permit reporting forms]]
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*[[Links for TMDLs]]
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==Links and other resources==
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<!--
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*[[Links for TMDLs]]  
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-->
 
*Visit the [https://www.pca.state.mn.us/water/total-maximum-daily-load-tmdl-projects#draft-pending-projects-990aee4d MPCA TMDL Project page] for information on specific projects across the state
 
*Visit the [https://www.pca.state.mn.us/water/total-maximum-daily-load-tmdl-projects#draft-pending-projects-990aee4d MPCA TMDL Project page] for information on specific projects across the state
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*[[Total Suspended Solids (TSS) in stormwater|Total Suspended Solids (TSS)]]
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*[[Phosphorus]]
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*[[Bacteria in stormwater]]
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<!--
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*[[Chloride in stormwater]]
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-->
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*[https://stormwater.pca.state.mn.us/index.php?title=Protection_and_restoration_of_receiving_waters Protection and restoration of receiving waters]
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[[Category:Level 3 - Regulatory/Municipal (MS4)/TMDLs]]

Latest revision as of 19:49, 8 November 2024

Total Maximum Daily Loads (TMDLs) are EPA approved amounts of pollutant loading that can occur and have a water body meet water quality standards. This page is collection of links and resources to better understand, and meet, TMDL requirements.

image of Miss and St Croix rivers confluence
Confluence of the St. Croix and Mississippi rivers. Note the St. Croix River is not impaired for sediment, while the Mississippi River is impaired.

TMDL MS4 permit guidance

TMDL toolkit for MS4 permit compliance

image
Access a quick guide for using models to meet MS4 TMDL requirements

TMDL guidance and general information

Information received from MS4 permittees

Links and other resources

Retrieved from "https://stormwater.pca.state.mn.us/index.php?title=Total_Maximum_Daily_Loads_(TMDLs)&oldid=69727"

This page was last edited on 8 November 2024, at 19:49.