Commercial Stormwater Credit Application

Complete this form to apply for a credit.

2021 applications are now closed

Please check back soon for information on the 2022 application.

Before you begin

Be sure you have the required application materials
  • A map detailing the drainage for the entire site including:
    • Drainage area delineations to each BMP, including impervious area totals
    • All related infrastructure to the BMP, including inlets, outlets, storm pipes, manholes and underdrains
    • Any connection points to the City of Minneapolis stormwater system
  • Modeling information to prove you are meeting the criteria

Get templates and examples of supporting materials

Quality credit criteria
  • Prove 70% TSS reduction for 1.25-inch storm event
  • Provide water quality model inputs and results using one of these models:
    • P8 (version 2.4 or newer)
    • WinSLAMM (version 9.4 or newer)
    • MIDS Calculator
Quantity credit criteria
  • 10-year or 100-year design storm event for quantity credit
  • Provide hydrologic and hydraulic inputs and results for pre-existing and as-built conditions using one of these models:
    • HydroCAD - NRCS/SCS curve number runoff methodology
    • XP-SWMM - XP-SWMM runoff methodology 
  • You must capture 100% of the impervious runoff from your site.


Request accessible format

If you need help with this information, please email 311, or call 311 or 612-673-3000.

Please tell us what format you need. It will help us if you say what assistive technology you use.

2021 Commercial Stormwater Credit Application-Closed

Contact us

Danielle Schumerth

Stormwater Credits Program Coordinator
Public Works Department