Michigan

Michigan Nonpoint Source Best Management Practices Manual

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This PDF is Part 1 (introductory/background, 31 pages); individual BMP design specifications are published separately on the MDEQ BMP web page.

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software

Other manuals in Michigan: City of Detroit

Document Metadata

Jurisdiction level

state

“Michigan Department of Environmental Quality”
Title Page

State

Michigan

“Michigan Nonpoint Source Best Management Practices Manual”
Title Page

Version / edition

Rev 2017.6.27

“Rev 2017.6.27”
Title Page

Adoption / effective date

2017-06-27

“Rev 2017.6.27”
Title Page

Last revised date

2017-06-27

“appropriate version number, based on the last revision date, placed in the lower right corner of each page”
Page 3, Foreword

Relationship to state manual

independent

“BMPs developed specifically for use in Michigan”
Page 11

Design Criteria

Design storm return periods (years)

1-year, 2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“storms of 24-hour duration, with AEPs of 99.9%, 50%, 20%, 10%, 4%, 2%, and 1%; the corresponding average recurrence intervals of these AEPs are one (1), two (2), five (5), 10, 25, 50, and 100 years”
Page 13, Hydrology

Water quality volume method

Treatment of runoff produced by all storm events up to and including the 10 percent exceedance runoff-generating storm event (first flush volume); statewide 10% exceedance precipitation values range from 0.77 to 1.00 inches. A conservative alternative is treatment of 1.0 inches of runoff over the entire site.

“Treatment of runoff produced by all storm events up to and including the 10 percent exceedance runoff-generating storm event... A conservative alternative is treatment of 1.0 inches of runoff over the entire site.”
Page 17, Unified Sizing Criteria

Peak flow calculation method(s)

Presettlement hydrology unified sizing criteria, NOAA Precipitation Frequency Data Server (PFDS)

“The recommended hydrologic baseline condition used in this manual is the presettlement hydrology of the site... Channel Protection – Maintain the calculated presettlement runoff volume and peak flow rate for all storm events up to the 2-year, 24-hour event.”
Pages 13, 17

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Prevention/Minimization/Infiltration, Treatment, Mitigation, Conveyance, Storage, Physical, Vegetative, Managerial, Porous pavement, Bio-retention cells, Rain gardens, Infiltration trench, Infiltration basin, Retention or detention basins, Constructed wetlands

“prevention/minimization, storage, treatment, conveyance, or mitigation”
Page 11, Storm Water BMPs