City of Dayton

Department of Water Engineering Design Standards — Section 5 Storm Water Requirements

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Compare each cited field to the official PDF before relying on it. What this means

Section 5 only (11 pages); not a full multi-volume BMP design manual. HEAD 404 but GET works. Pipeline excerpt repair removed 1 unlocated citation(s).

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software, document_metadata.relationship_to_state_manual

Other manuals in Ohio: City of Akron, City of Cincinnati, City of Cleveland, City of Columbus, City of Toledo, City of Youngstown, Ohio, Ohio Department of Transportation (ODOT)

Document Metadata

Jurisdiction level

City

No evidence cited

State

Ohio

No evidence cited

Version / edition

October 2020

“October 2020”
Header

Adoption / effective date

2020-10-01

No evidence cited

Last revised date

2020-10-01

No evidence cited

Relationship to state manual

Not found in document

No evidence cited

Design Criteria

Design storm return periods (years)

1-year, 25-year, 50-year, 100-year

“Major waterways ... 100 years ... Secondary ... 50 years ... Minor ... 25 years”
§5.1 A

Water quality volume method

Peak-rate control: post-development peak runoff ≤ pre-development for all 24-hour storms from 1-year through the critical year storm; detention volume methods based on percent increase in 1-year 24-hour runoff volume. Post-construction BMPs per Ohio EPA Construction General Permit OHC000002 (SWP3 Part III) with O&M manuals required. Section is conveyance/detention focused rather than a standalone WQv rainfall-depth manual.

“post-development peak rate of runoff does not exceed that of the pre-development stage, for all 24-hour storms ... Post Construction Storm Water Management requirements ... Ohio EPA Permit No.: OHC000002”
§5.1 D / §5.6

Peak flow calculation method(s)

Major waterways (>4 sq mi): 100-year, Secondary (1–4 sq mi): 50-year, Minor (≤1 sq mi open channels): 25-year, Detention: post ≤ pre for 24-hr storms 1-year through critical year, Runoff curve numbers / detention routing

No evidence cited

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Detention basins, Retention basins, Storm sewer / closed conduits, Open channels, Post-construction BMPs per Ohio EPA CGP, Dry wells (limited / geotech)

“Section 5.4 Detention/Retention Basins ... post construction BMPs”
§5.4 / §5.6