City of Madison

Madison General Ordinances Chapter 37 — Public Stormwater System including Erosion Control (ORD-25-00017 amendments)

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Compare each cited field to the official PDF before relying on it. What this means

Ordinance amendment PDF rather than standalone design manual; design criteria live in Ch. 37 text. DSC webpage also cites 1–200yr rate control for large new impervious. Pipeline excerpt repair removed 2 unlocated citation(s).

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software, document_metadata.state_code, document_metadata.relationship_to_state_manual

Other manuals in Wisconsin: Milwaukee Metropolitan Sewerage District, Wisconsin, Wisconsin Department of Natural Resources

Document Metadata

Jurisdiction level

City

“City of Madison”
Ordinance

State

Not found in document

No evidence cited

Version / edition

ORD-25-00017 (effective April 1, 2025)

“ORD-25-00017”
Ordinance

Adoption / effective date

2025-04-01

“These changes will go into effect on April 1, 2025.”
Drafter analysis / §31

Last revised date

2025-03-17

“Date: March 17, 2025”
Ordinance file path

Relationship to state manual

Not found in document

No evidence cited

Design Criteria

Design storm return periods (years)

10-year, 25-year, 100-year, 500-year

“10-year / 100-year / 500-year storm event”
Design standards

Water quality volume method

Chapter 37 stormwater management plan requirements include peak detention, infiltration, and TSS control (with enumerated exemptions). Promote infiltration and groundwater recharge. TSS load reduction to maximum extent practicable. Green infrastructure definitions updated.

“peak detention, infiltration and Total Suspended Solids (TSS)”
Drafter analysis

Peak flow calculation method(s)

Public stormwater system additions generally convey upstream runoff for the 10-year storm event, Culvert crossings in greenways: 100-year without road overtopping, Enclosed depressions: convey 100-year (and 25/100-year increases where specified), 500-year conveyance/overflow route requirements

“convey the runoff that would drain from upstream lands during the 10-year storm event”
Design standards

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Green infrastructure, Green roofs, Infiltration basins / underground infiltration fields, Detention, TSS control practices

“Green Infrastructure / infiltration basins”
Definitions / standards