City of Peoria
Unified Stormwater Ordinance / Manual of Practice Chapter 17
CityIllinoishighNoCitations verified
Other manuals in Illinois: City of Chicago, City of Rockford, City of Springfield, Cook County, Illinois, Illinois EPA / Association of Illinois Soil and Water Conservation Districts
Document Metadata
Jurisdiction level
City
No evidence cited
State
Illinois
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Version / edition
September 2012
No evidence cited
Adoption / effective date
Not found in document
No evidence cited
Last revised date
2012-09
No evidence cited
Relationship to state manual
independent
No evidence cited
Design Criteria
Design storm return periods (years)
1-year, 10-year, 100-year
No evidence cited
Water quality volume method
Water Quality Volume = volume necessary to collect 100% of runoff from a specified event; detain ≥24 hours from 1-year HWL (detention) or 2-year HWL (certain BMPs) until complete drainage. Release-rate design for Class 2 grading/drainage: 1-year (≤0.08 cfs/acre with 24-hr detention), 10-year 0.08 cfs/acre, 100-year 0.30 cfs/acre (Illinois River direct discharges exempt from 10-/100-year limits but still need 24-hr 1-year WQ detention).
“Water Quality Volume means the volume necessary to collect 100 percent of the runoff generated from a specified event. This volume shall be detained for a period not less than 24 hours”
Definitions §120
Peak flow calculation method(s)
Release rates (cfs/acre) for 1-/10-/100-year, Rational Formula (minor systems ≤10–100 acres), Hydrograph / reservoir routing for detention, IDOT Drainage Manual methods (as modified)
“10-year 0.08 100-year 0.30 ... 1-year release rate ... not be greater than 0.08 cfs/acre”
Section Three, Article II.B Release Rates
Hydrologic/hydraulic software
Not found in document
No evidence cited
Approved BMP categories
Wet bottom detention basins, Wetland basins, Dry basins, Infiltration trenches, Swales / native landscaping, Porous pavement, Other BMPs meeting WQv detention
No evidence cited