City of Chesapeake

Stormwater Management and Drainage Design

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Other manuals in Virginia: Arlington County, City of Alexandria, City of Charlottesville, City of Norfolk, City of Richmond, City of Roanoke, Fairfax County, Virginia Department of Environmental Quality (DEQ), Virginia Department of Transportation (VDOT)

Document Metadata

Jurisdiction level

City

“Stormwater, for both water quantity and quality, shall be designed in general by the criteria established herein, the City's Master Drainage Plan”
Section 5.0 GENERAL

State

Virginia

“the Virginia Department of Transportation Drainage Manual and the Virginia Stormwater Management Handbook”
Section 5.0 GENERAL

Version / edition

Revised December 2016

“Revised 12/16 STORMWATER MANAGEMENT & DRAINAGE DESIGN”
Page headers

Adoption / effective date

Not found in document

No evidence cited

Last revised date

2016-12

“Revised 12/16”
Page headers

Relationship to state manual

independent

“Stormwater, for both water quantity and quality, shall be designed in general by the criteria established herein, the City's Master Drainage Plan, the Virginia Department of Transportation Drainage Manual and the Virginia Stormwater Management Handbook. When there is a conflict between the Virginia Department of Transportation Drainage Manual, the Hampton Roads Planning District Commission Regional Construction Standards and these criteria, these criteria shall govern.”
Section 5.0 GENERAL A–B

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“24 Hour Rainfall Depths (NOAA's NWS)... 2-yr. 3.7" 5-yr. 5.0" 10-yr. 6.0" 25-yr. 7.0" 50-yr. 8.17" 100 9.44"”
Section 5.2 HYDROLOGY B, Page 5-5

Water quality volume method

Virginia Runoff Reduction Method (VRRM) with DEQ compliance spreadsheets: prevent a net increase in nonpoint source pollution for new development (post-development load shall not exceed predevelopment based on average land cover conditions); for redevelopment, achieve a 10% reduction when land disturbance is less than one acre and a 20% reduction when one acre or greater (Chesapeake Bay Preservation Area Designation and Management Regulations). Non-proprietary BMP pollutant removal efficiencies in Table 4.1 are based upon 1 inch of rainfall.

“Virginia's proposed Stormwater Management Program (VSMP) Permit Regulations (4 VAC 50-60 et seq.) include water quality and quantity requirements based, in part, on the "Virginia Runoff Reduction Method" (VRRM).”
Section 5.4 B. Water Quality

Peak flow calculation method(s)

Rational method (storm drainage HGL; <200 acres = 10-year, >200 acres = 50-year), NRCS / SCS Type II 24-hour hydrographic methods (basins >200 acres or detention design), NRCS runoff curve number / volumetric runoff coefficients

“Storm drainage systems including Hydraulic Grade Line, etc. shall be designed using the rational method, for the recurrence frequency as follows”
Section 5.3 HYDRAULICS A.1

Hydrologic/hydraulic software

HEC-HMS, HEC-GeoHMS, TR-55, TR-20, Pond Pack, WMS / Watershed Modeling, HEC-RAS, EPA SWMM, FHWA HY-8, CulvertMaster, FlowMaster, Virginia Runoff Reduction Method (VRRM) Compliance Spreadsheet, HSPF

“25-yr. 7.0” 50-yr. 8.17” 100 9.44” C. Acceptable methods for runoff analysis are tabulated below: Model Major Sys. Minor Sys. Hydrologic Hydraulic Water Quality Hydrology Software HEC-GeoHMS X X HEC-HMS X X TR-55 X TR-20 X Pond Pack X X X WMS X X Watershed Modeling X X Hydrauli”
p. 5

Approved BMP categories

Rooftop Disconnection, Sheetflow to Vegetated Filter or Conserved Open Space, Grass Channel, Soil Amendments, Vegetated Roof, Rainwater Harvesting, Permeable Pavement, Infiltration, Bioretention / Urban Bioretention, Dry Swale, Wet Swale, Filtering Practice, Constructed Wetland, Wet Pond, Extended Detention Pond, Dry Detention (Virginia Stormwater Management BMP Clearinghouse), Wet Detention (Virginia Stormwater Management BMP Clearinghouse)

“and/or maintenance. 4. Acceptable BMP Facilities: Post construction BMPs can be either Non-Proprietary BMPs or Proprietary/Manufactured BMPs. DEQ is currently evaluating Proprietary/Manufactured BMP’s for recommended efficiencies; there are no approved Proprietary/Man”
p. 18