WisDOT Stormwater Management & TS4 Update - Hans Hallanger - 2022 NASECA-WI 19th Annual Conference

Sep 11, 2026

WisDOT Stormwater Management & TS4 Update presents a statewide approach to stormwater quality management led by Wisconsin Department of Transportation staff and coordinated under agreements with the Wisconsin DNR. The update covers the Transportation Separate Storm Sewer System (TS4) and Transportation Construction General Permit (TCGP) framework, along with statewide TSS modeling and I-39 reduction activities. It outlines responsibilities for illicit discharge checking, development of Stormwater Pollution Prevention Plans, and ongoing updates to cooperative agreement attachments, including erosion control, wetlands, and floodplain connectivity.

LanguageEnglish

CategoryPresentations

FormatPDF

Pages13

Reading Time5 min

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WisDOT Stormwater Management & TS4 Update

Program overview and regulatory framework

Illicit discharge checking and statewide modeling

SWPPP development and cooperative agreement updates

Post-construction stormwater requirements and guidance

Typical design best practices and common issues

Stormwater design challenges and project categories

TS4 and TCGP stormwater permit requirements

Stormwater reporting requirements for WisDOT projects

WisDOT Stormwater Management & TS4 Update 2/9/2022 WisDOT Stormwater Management & TS4 Update Hans Hallanger, P.E. WisDOT Statewide Stormwater Quality Engineer 2022 NASECA-WI 19th Annual Conference Madison, WI February 9, 2022 1 Contact Info Hans D. Hallanger, P. E. -WisDOT Statewide Stormwater Quality Engineer DTSD, BTS, ESS 4822 Madison Yards Way, S513 .10 P.O. Box 7965 Madison, WI 53707-7965 Phone: (608) 266-0279 Email: [Hans.Hallanger@dot.wi.gov](Hans.Hallanger@dot.wi.gov) 2 WisDOT Stormwater Management Program • Program described by Cooperative Agreement w/DNR many years ago • 2018 􀂃 Transportation Separate Storm Sewer System (TS4) DNR Permit • Urbanized Areas 􀂃 Transportation Construction General Permit (TCGP) • Post-Construction SW requirements statewide • Document SW Program in Annual Report 3 | Annual Report | | | --- | --- | 4 | Education, Public Outreach, Involvement & Participation | | | --- | --- | | | | | | | 5 6 Wisconsin Department of Transportation 1 WisDOT Stormwater Management & TS4 Update 2/9/2022 | ILLICIT Discharge Checking | | | --- | --- | 7 Overall Statewide TSS Modeling 8 TSS Reduction for I-39 in Rock River TMDL 9 Develop Stormwater Pollution Prevention Plans (SWPPPs) • DOT contracts Counties to perform roadway maintenance (i.e. DOT does not own any DPW yards) • DOT owns 22 properties that require SWPPPs 10 Continue to Update Cooperative Agreement (CoA) w/ DNR • Attachments to CoA 􀂃 Stormwater, Erosion Control, Wetlands, Threatened & Endangered Species, Aquatic Connectivity, Floodplains & Waterway Crossings • Developing Selected Site Attachment 􀂃 Contractors off-project locations for temporary support activities • Updating Floodplain & Waterway Attachment 11 WisDOT Post-Construction Stormwater Requirements Guidance • Admin. Code Trans 401-Construction Site Erosion Control and Stormwater Management Procedures for Department (DOT) Actions 􀂃 Similar to NR 151 • Facilities Development Manual (FDM) Chapters 10 & 13 • DNR Permits 􀂃 TCGP 􀂃 TS4 • Regional & project specific goals 12 Wisconsin Department of Transportation 2 WisDOT Stormwater Management & TS4 Update 2/9/2022 Update & Develop Guidance for PostConstruction SW Management & Construction Erosion Control • Facilities Development Manual (FDM) Chapter 10 􀂃 Erosion Control & Stormwater Quality • FDM Chapter 13 􀂃 Drainage 13 Typical Stormwater Design Best Practices • Perform Elevation & Sizing analysis early • Prepare narrative at beginning of design w/calcs/Plans/Exhibits • Allocate enough space • Focus on critical elements 􀂃 Where water goes in and drains out 􀂃 Relationship between the water and surroundings • Avoid overcomplicating • Keep updating/refining 14 Typical Stormwater Issues • Conveying runoff to facilities • Runoff overloading downstream areas • Overdesigned = expensive & Undersized = not functioning properly • Elevations 􀂃 Storm sewers/culverts too deep or too shallow 􀂃 Facilities outfall conflicts w/ downstream areas 􀂃 Facilities water elevations conflicts 15 WisDOT Stormwater Design Challenges • Multiple engineers & staff • Deliberate Design Process • Staff Changes • Timing & Project Changes • Lack of ROW 16 WisDOT Directed & Supervised Project Categories 1. WisDOT Roadways 􀂃 Interstate, I-94, I-90, I-43, I-41 􀂃 U.S. Highways, 45, 151, 10, 53, 12, 14, 18 􀂃 State Highways, 29, 8, 19, 60 2. Connecting Highways 􀂃 Some WisDOT Roadways Within Some Municipalities 3. Local Program 􀂃 Local Road projects directed & supervised by WisDOT 17 WisDOT Project Categories Key Elements • Directed & Supervised by WisDOT 􀂃 WisDOT • Design Project Manager (PM) & eventual Construction PM • Environmental Document & Design Process • Construction Plan Template • WDNR DNR Transportation Liaison Review & Coordination from beginning of planning

FAQs

What are the key program components covered in the WisDOT Stormwater Management & TS4 Update?

The update covers the WisDOT stormwater management program, TS4-related requirements, and TCGP post-construction obligations, along with statewide processes for planning, reporting, and coordination with DNR.

How does WisDOT handle illicit discharge checking and related modeling?

The materials include statewide TSS modeling and specific TSS reduction work for I-39 in the Rock River TMDL, alongside broader illicit discharge checking efforts.

What guidance and reporting requirements apply to WisDOT post-construction stormwater management?

The update references TRANS 401 post-construction performance planning, Facilities Development Manual guidance for stormwater report applicability and development, and TS4/TCGP implementation tied to applicable permit performance standards.

Sep 11, 2026

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