Wayne County

Wayne County Stormwater Control Program — Standards Manual

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Other manuals in Michigan: City of Ann Arbor, City of Detroit, City of Flint, City of Grand Rapids, City of Lansing, Michigan, Michigan

Document Metadata

Jurisdiction level

County

“Wayne County”
Cover

State

Not found in document

No evidence cited

Version / edition

Effective September 3, 2021

“September 2021”
Footer

Adoption / effective date

2021-09-03

“effective September 3, 2021”
Landing / cover program

Last revised date

2021-09-03

“September 2021”
Footer

Relationship to state manual

independent

“Wayne County Stormwater Ordinance, Administrative Rules, and Standards Manual”
Introduction

Design Criteria

Design storm return periods (years)

2-year, 100-year

“100-year recurrence interval storm; 2-year recurrence interval storm”
Chapter 5

Water quality volume method

First Flush / WQC: remove ≥80% TSS or limit peak TSS to 80 mg/L for the first 1.0 inch of rainfall. CPVC: infiltrate first 1.0 inch of rainfall where soils/groundwater permit. CPRC: store and release volume from a 1.9-inch storm over ≥48 hours.

“remove 80 percent or more of the total suspended solids (TSS) load ... first one (1) inch of rainfall”
§5.2

Peak flow calculation method(s)

100-year flood control: ≤0.15 cfs/acre for drainage areas ≥100 acres, Variable release rate curve for areas <100 acres (0.15–1.0 cfs/acre), Detention / retention systems with flow restrictors

“peak flow rate ... must not exceed 0.15 cfs/acre for a 100-year recurrence interval storm”
§5.1

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Open detention basins, Retention basins, Underground detention, Bioretention, Water quality / infiltration systems, Pretreatment systems, Conveyance BMPs

“Detention Basins; Underground Detention; Bioretention; Water Quality/Infiltration Systems”
Chapter 8 TOC