West Virginia

West Virginia Stormwater Management and Design Guidance Manual

StateWest VirginiahighNo

Open source PDF ↗Official agency page ↗

Document Metadata

Jurisdiction level

state

“West Virginia Department of Environmental Protection”
Title Page

State

West Virginia

“West Virginia Stormwater Management”
Title Page

Version / edition

November 2012

“November 2012”
Title Page

Adoption / effective date

Not found in document

No evidence cited

Last revised date

2012-11-01

“November 2012”
Title Page

Relationship to state manual

independent

“manual will be used to implement stormwater management practices that will help to protect and restore water bodies”
Foreword

Design Criteria

Design storm return periods (years)

1-year, 2-year, 10-year

“keep and manage on site the first one inch of rainfall from a 24-hour storm”
2.5

Water quality volume method

Runoff Reduction Method: manage on-site runoff from a one-inch rainfall event (90th percentile; Treatment Volume Tv). Tv uses volumetric runoff coefficients (Rv) for impervious cover, managed turf/disturbed soils, and forest/open space land covers.

“90% of the annual rainfall events are one (1) inch or less. Therefore, the BMP Performance Goal is to manage on-site the runoff from a one-inch rainfall event”
3.2.2

Peak flow calculation method(s)

Runoff Reduction Method with adjusted NRCS curve numbers (TR-55 Equations 2-1 through 2-4), Rational Method, NRCS TR-55 single-event design storm methodology, Continuous simulation rainfall-runoff modeling

“utilizes the NRCS TR55 runoff equations 2-1 through 2-4 to derive a reduced curve number”
3.4.4

Required hydrologic/hydraulic software

Design Compliance Spreadsheet, TR-55

“The Design Compliance Spreadsheet is a tool that integrates the runoff volume reduction methods”
3.4.5

Approved BMP categories

Better Site Design Practices, Sheet Flow to Vegetated Filter Strips and Conservation Areas, Impervious Surface Disconnection, Bioretention, Permeable Pavement, Grass Swale, Infiltration, Regenerative Stormwater Conveyance System, Rainwater Harvesting, Vegetated Roofs, Filtration Practice, Stormwater Wetlands

“4.2.3. Bioretention (BR) ... 4.2.4. Permeable Pavement (PP) ... 4.2.11. Stormwater Wetlands (SW)”
Table of Contents