Urban Drainage and Flood Control District (Denver Metro)

Urban Storm Drainage Criteria Manual Volume 3, Chapter 1: Stormwater Management and Planning

Special DistrictColoradomediumNeeds review

This extraction needs human review.

Source is USDCM Volume 3 Chapter 1 only (planning and regulatory overview). WQCV (0.6 in.) and Four Step Process are explicit; peak flow calculation methods and required software appear in later chapters. Jurisdiction is UDFCD (Denver metro special district); document hosted at mhfd.org.

Fields not found in document: document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, design_criteria.peak_flow_calculation_method, design_criteria.required_hydrologic_hydraulic_software

Document Metadata

Jurisdiction level

special district

“Urban Drainage and Flood Control District”
Page 1-1, Chapter 1

State

Colorado

“The Colorado Water Quality Control Act (25-8-101 et seq., CRS 1973, as amended)”
Section 3.2, Page 1-7

Version / edition

November 2015

“November 2015 Urban Drainage and Flood Control District”
Page 1-1, Chapter 1

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

“UDFCD criteria are based on a Four Step Process focused on reducing runoff volumes, treating the remaining WQCV, stabilizing receiving drainageways and providing targeted source controls for post-construction operations at a site.”
Section 6.0 Conclusion, Page 1-19

Design Criteria

Design storm return periods (years)

2-year

“EURV represents the difference between the developed and pre-developed runoff volume for the range of storms that produce runoff from pervious land surfaces (generally greater than the 2-year event).”
Common Stormwater Management Terms, Page 1-9

Water quality volume method

Water Quality Capture Volume (WQCV) based on runoff from 0.6 inches of precipitation within the UDFCD boundary, representing runoff from frequent storm events such as the 80th percentile storm; remaining runoff after volume reduction is treated through capture and slow release of the WQCV.

“Water Quality Capture Volume (WQCV): This volume represents runoff from frequent storm events such as the 80th percentile storm. Within the UDFCD boundary, the WQCV is based on runoff from 0.6 inches of precipitation.”
Common Stormwater Management Terms, Page 1-9; Section 4.2, Page 1-17

Peak flow calculation method(s)

Not found in document

No evidence cited

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Grass Buffers, Grass Swales, Bioretention (rain gardens), Permeable Pavement, Green Roofs, Extended Detention Basins, Sand Filters, Constructed Wetland Ponds, Retention Ponds, Underground BMPs, Source Control BMPs

“permeable pavement systems with subsurface storage, bioretention, extended detention basins, sand filters, constructed wetland ponds, and retention ponds. Green roofs and some underground BMPs may also provide the WQCV”
Section 4.2, Page 1-17