City of Minneapolis

Stormwater and Sanitary Sewer Guide

CityMinnesotahighNo

Open source PDF ↗Official agency page ↗

Other manuals in Minnesota: Minnesota

Document Metadata

Jurisdiction level

municipality

“Developed by Minneapolis Public Works Surface Water and Sewers Division”
Title Page

State

Minnesota

“a duly licensed professional engineer under the laws of the state of Minnesota”
Certification / Plan worksheets

Version / edition

October 2017, Revision #2: February 2025

“October 2017 Revision #1: October 2021 Revision #2: February 2025”
Title Page

Adoption / effective date

2017-10

“Prepared by City of Minneapolis October 2017”
Title Page

Last revised date

2025-02

“Revision #2: February 2025”
Title Page

Relationship to state manual

adopts state manual directly

“The City of Minneapolis considers the Minnesota Stormwater Manual, prepared by the MPCA, to be the City's approved design manual”
Section 4.3.1.8, Page 34

Design Criteria

Design storm return periods (years)

2-year, 10-year, 100-year

“Rate control: No increase in the peak discharge over existing conditions for the 2-year, 10-year, and 100-year 24-hour storm event”
Section 4.3.1.1, Page 20

Water quality volume method

Rate control: no increase in peak discharge over existing for 2-, 10-, and 100-year 24-hour events (NRCS MN MSE 3 distribution). Water quality: 70% TSS removal from a 1.25-inch storm event, plus receiving-water-specific TP reductions (Table 4-1). Volume control: capture and retain 1.1 inches of runoff from new and fully reconstructed impervious (new/redevelopment); linear projects retain the larger of 0.55 inches from new/reconstructed impervious or 1.1 inches from net impervious increase; drawdown ≤48 hours.

“Water quality: Seventy percent (70%) removal of total suspended solids (TSS) from a 1.25-inch storm event. Sites discharging to a lake, pond, or wetland listed in Table 4-1 must ALSO reduce total phosphorus (TP) load as specified in the table”
Section 4.3.1.2, Page 21

Peak flow calculation method(s)

NRCS/SCS curve number runoff methodology, XP-SWMM runoff methodology, NRCS MN MSE 3 storm distribution

“The storm distribution for the above-identified storm events shall be the NRCS MN MSE 3”
Section 4.3.1.1, Page 20

Required hydrologic/hydraulic software

HydroCAD, XP-SWMM, P8, WinSLAMM

“The hydrologic and hydraulic models accepted by the City of Minneapolis include: HydroCAD; XP-SWMM”
Section 4.3.1.6, Page 26

Approved BMP categories

Pond systems/detention basins, Infiltration cells (rain gardens), Infiltration trenches, Filtration systems, Vegetated channels, Grit chambers, Oil/water separators, Green infrastructure

“A partial list of structural BMPs and devices includes pond systems/detention basins, infiltration cells (“rain gardens”), infiltration trenches, filtration systems, vegetated channels, grit chambers, and oil/water separators. BMPs that use the properties of vegetation or soil... are often referred to as “green infrastructure.””
Glossary, Stormwater best management practices