City of Columbia

Best Management Practice (BMP) Design Manual

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Other manuals in South Carolina: City of Charleston, City of Greenville, South Carolina, South Carolina

Document Metadata

Jurisdiction level

City

“City of Columbia”
Cover

State

South Carolina

“Columbia, South Carolina”
Cover

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“Georgia Stormwater Management Manual (GSMM) will also be utilized”
Ch. 1

Design Criteria

Design storm return periods (years)

1-year, 2-year, 25-year, 100-year

“Provide extended detention of the 1-year storm event released over a period of 24 hours to reduce bank-full flows and protect downstream channels from erosive velocities and unstable conditions. Overbank Flood Protection Provide peak discharge control of the 25-year storm e”
pp. 20–21

Water quality volume method

Sites disturbing >1 acre: treat runoff from a 1.2-inch rainfall event (WQv via Unified Stormwater Sizing Criteria / GSMM methods), released over ≥24 hours for detention ponds. Also treat Channel Protection Volume (CPv) for the 1-year storm (≥24-hour release). Overbank flood protection Q25 and extreme flooding addressed. Pretreatment required; commercial/parking >2,000 sf need hydrocarbon capture.

“treat at least the runoff from the entire site for a 1.2-inch rainfall event”
§1 Water Quality

Peak flow calculation method(s)

Unified Stormwater Sizing Criteria (WQv / CPv), GSMM Sections 3.2–3.4 for structural BMPs, Overbank Flood Protection (Q25)

“Channel Protection Volume ... 1-year storm; Overbank Flood Protection (Q25)”
Ch. 1–2

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Water quality BMPs (GSMM structural controls), Detention ponds, Pretreatment (forebay, micro-pool, filter strips, vault), Better site design practices

“permanent water quality BMP ... pretreatment device such as a forebay”
§1 Water Quality