City of Springfield
Illinois Model Stormwater Management Ordinance (capital MS4 template reference)
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Compare each cited field to the official PDF before relying on it. What this means
Placeholder statewide model ordinance — replace when City of Springfield publishes a local drainage/stormwater design manual PDF.
Other manuals in Illinois: City of Chicago, City of Peoria, City of Rockford, Cook County, Illinois, Illinois EPA / Association of Illinois Soil and Water Conservation Districts
Document Metadata
Jurisdiction level
City
No evidence cited
State
Illinois
No evidence cited
Version / edition
September 2015
No evidence cited
Adoption / effective date
Not found in document
No evidence cited
Last revised date
2015-09
No evidence cited
Relationship to state manual
adopts state manual directly
No evidence cited
Design Criteria
Design storm return periods (years)
10-year, 100-year
No evidence cited
Water quality volume method
IL Model Stormwater Management Ordinance / Illinois Urban Manual BMP framework. Site runoff controls for large storms through the 100-year event with post-development discharge rates not exceeding pre-development for specified events. Minor storm sewers/inlets/swales designed for the 10-year critical duration storm; BMPs per Illinois Urban Manual.
“10-year critical duration storm shall be used as a minimum for the design of storm sewers, storm inlets, and minor swales”
IL Model Ordinance §506
Peak flow calculation method(s)
Hydrologic methods allowed by ordinance (e.g., HEC-HMS), 10-year critical duration for minor conveyance, 100-year site runoff / flood controls
No evidence cited
Hydrologic/hydraulic software
Not found in document
No evidence cited
Approved BMP categories
Illinois Urban Manual BMPs, Detention / retention, Storm sewers and swales, Erosion and sediment controls
No evidence cited