Georgia

Stormwater Management Manual Georgia

StateGeorgiahighNo

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

Other manuals in Georgia: Coastal Georgia (Chatham County–Savannah region)

Document Metadata

Jurisdiction level

state

“GEORGIA VOLUMES 1 & 2”
Title Page

State

Georgia

“GEORGIA VOLUMES 1 & 2”
Title Page

Version / edition

2016 Edition

“2016 EDITION”
Title Page

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

“The Georgia Stormwater Management Manual is organized as a three volume set”
1

Design Criteria

Design storm return periods (years)

1-year, 2-year, 10-year, 25-year, 100-year

“the 1-year, 25-year, and 100-year return intervals... 2-year through the 25-year return frequency storm events”
105, 112

Water quality volume method

Sized to treat the runoff from 85% of the storms that occur in an average year, which equates to 1.2 inches of rainfall (Water Quality Volume, WQv), or the first 1.0 inch of rainfall using runoff reduction practices to the maximum extent practicable. If the entire 1.0 inch is reduced, the water quality volume may be waived. Otherwise, the remaining runoff from the 1.2-inch event must be treated to remove at least 80% of average annual TSS.

“Stormwater management systems shall be designed to retain or treat the runoff from 85% of the storms that occur in an average year, and reduce average annual post-development total suspended solids loadings by 80%. Averaged from rainfall events across the state of Georgia, this equates to treating storm events of 1.2 inches or less, as well as the first 1.2 inches of runoff for all larger storm events.”
111

Peak flow calculation method(s)

SCS Curve Number Method

“What is the SCS curve number for this sub-watershed”
154

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Bioretention Basin, Bioslopes, Dry Wells, Infiltration Trenches, Organic Filters, Regenerative Stormwater Conveyance, Sand Filters, Stormwater Planters/Tree Boxes, Downspout Disconnects, Site Reforestation/Revegetation, Soil Restoration, Vegetated Filter Strips, Dry Detention Basins, Dry Extended Detention Basins, Multi-Purpose Detention Basins, Stormwater Ponds, Stormwater Wetlands, Gravel Wetlands, Enhanced Dry Swales, Enhanced Wet Swales, Grass Channels, Gravity Separators, Proprietary Systems, Underground Detention, Green Roofs, Permeable Paver System, Pervious Concrete, Porous Asphalt, Rainwater Harvesting

“Bioretention Basin; Bioslopes; Dry Wells; Infiltration Trenches; Organic Filters; Regenerative Stormwater Conveyance; Sand Filters; and Stormwater Planters/Tree Boxes”
199