City of Charlottesville
Standards and Design Manual — Chapter 5 Stormwater Management
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Document Metadata
Jurisdiction level
City
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State
Virginia
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Version / edition
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Adoption / effective date
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Last revised date
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Relationship to state manual
adopts state manual directly
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Design Criteria
Design storm return periods (years)
10-year, 100-year
“post-development 10% AEP 24-hour storm event ... 1% AEP storm event shall be utilized as a check storm”
§5.3.1.1–5.3.1.2
Water quality volume method
City Code Ch.10 VSMP: water quality per latest Virginia Stormwater BMP Clearinghouse Standards and Specifications and DEQ Stormwater Management Handbook (including drafts). Use DEQ Runoff Reduction Method spreadsheets for pollutant removal. Prefer on-site treatment; nutrient credits last resort for public projects. Flood protection: Part IIB / current VSMP; for existing man-made conveyance, contain post-development 10% AEP (10-year) 24-hour HGL within pipe/junctions. Check storm: 1% AEP (100-year) with emergency overflow. NOAA Atlas 14 rainfall; VDOT Drainage Manual for conveyance.
“latest Virginia Stormwater BMP Clearinghouse Standards and Specifications and DEQ Stormwater Management Handbook”
§5.4.1
Peak flow calculation method(s)
NOAA Atlas 14 / SCS 24-hour methods, Rational Method, VDOT Drainage Manual conveyance criteria, DEQ Runoff Reduction Method (quality)
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Hydrologic/hydraulic software
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Approved BMP categories
Virginia BMP Clearinghouse practices, Bioretention / GSI (preferred), Stormwater tree planters / curb extensions, Underground detention (with CCTV access), Other Clearinghouse-listed BMPs
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