Virginia Department of Environmental Quality (DEQ)

Virginia Stormwater Management Handbook, Chapter 8 — BMP Overview and Selection Criteria

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Chapter 8 only (July 2013 clearinghouse PDF) — BMP overview/selection, not the full Virginia Stormwater Management Handbook (EncodePlus). Treatment Volume (first 1-inch) and 1-year/24-hour channel protection are stated here; detailed hydrologic/peak-flow calculation methods and required software live in other handbook chapters and are not in this excerpt. 100-year appears mainly for floodplain setbacks and optional enlarged volume-reduction BMPs, not as a complete flood-control design chapter.

Fields not found in document: design_criteria.peak_flow_calculation_method, design_criteria.required_hydrologic_hydraulic_software, design_criteria.design_storm_return_periods_years (complete VSMP quantity/flood return periods beyond 1-year channel protection and 100-year floodplain references in this chapter)

Other manuals in Virginia: City of Chesapeake, City of Norfolk

Document Metadata

Jurisdiction level

state

“Virginia Stormwater Management Handbook, Chapter 8 July 2013”
Header throughout

State

Virginia

“Virginia Stormwater Management Handbook”
Header

Version / edition

July 2013

“Virginia Stormwater Management Handbook, Chapter 8 July 2013”
Header

Adoption / effective date

2013-07

“July 2013”
Header

Last revised date

2013-07

“July 2013”
Header

Relationship to state manual

independent

“Virginia Stormwater Management Handbook, Chapter 8... Complete standards and specifications for Virginia-approved post-construction BMPs and MTDs can be found on the Virginia BMP Clearinghouse web site”
Header; Section 8.3, Page 8-41

Design Criteria

Design storm return periods (years)

1-year, 100-year

“In Virginia, control of the 1-year 24-hour storm volume is considered the standard necessary to protect stream channel geomorphology”
Section 8.1.9, Page 8-11

Water quality volume method

Treatment Volume (Tv) from impervious surfaces sized to at least the first 1 inch of rainfall for runoff volume reduction BMPs. Practices are designed to capture and treat the full Tv (filtering, swales/open channels, infiltration, and basins with permanent pools).

“Generally, runoff volume reduction BMPs are designed to handle at least the Treatment Volume from impervious surfaces (first 1-inch of rainfall).”
Section 8.1.9, Page 8-11

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

Runoff volume reduction (vegetated roof, downspout disconnection, rainwater harvesting, soil compost amendments, sheet flow to vegetated filters or conserved open space), Swales or open channels (grass channel, dry swale), Filtering systems (filtering practices / sand filters, bioretention), Infiltration practices (permeable pavement, infiltration practices, bioinfiltration), Basins — ponds and wetlands (constructed wetlands, wet ponds, extended detention), Manufactured Treatment Devices (MTDs) verified via Virginia Stormwater BMP Clearinghouse / DEQ, Treatment trains

“8.2.2. Approved Virginia Non-Proprietary Stormwater Control Measures... Runoff volume reduction... Swales or open channels... Filtering systems... Infiltration practices... Basins”
Section 8.2.2, Page 8-32