Metropolitan Nashville and Davidson County

Stormwater Management Manual Volume 4 – Best Management Practices

CityTennesseelowNeeds review

This extraction needs human review.

Source text is Volume 4 Section 1 introduction only (BMP selection overview). No numeric design-storm return periods, peak-flow calculation methods, or required software appear in this excerpt; hydrologic/design criteria live in other SWMM volumes/sections (e.g., Volumes 1–3 and BMP fact sheets). Re-extract when full Vol4 BMP fact sheets or Procedures/Theory volumes are available.

Fields not found in document: design_criteria.design_storm_return_periods_years, design_criteria.peak_flow_calculation_method, design_criteria.required_hydrologic_hydraulic_software

Other manuals in Tennessee: Tennessee Department of Environment and Conservation

Document Metadata

Jurisdiction level

municipality

“for each type of BMP to be used in the Metropolitan Nashville and Davidson County (Metro) area”
Section 1.1, Page 1-1

State

Tennessee

“National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit issued by the Tennessee Department of Environment and Conservation (TDEC)”
Section 1.1, Page 1-1

Version / edition

2021 (Section 1 Introduction only)

“Volume 4 – Best Management Practices 2021”
Section 1 cover, Page 1-1

Adoption / effective date

2021

“Volume 4 – Best Management Practices 2021... Any future release of this manual supersedes any and all previous manual releases. Each page is dated to indicate the release date.”
Section 1.1, Pages 1-1 to 1-2

Last revised date

2021

“Volume 4 – Best Management Practices 2021”
Section 1 cover, Page 1-1

Relationship to state manual

independent

“It was prompted by requirements in Metropolitan Nashville and Davidson County’s National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit issued by the Tennessee Department of Environment and Conservation (TDEC).”
Section 1.1, Page 1-1

Design Criteria

Design storm return periods (years)

Not found in document

No evidence cited

Water quality volume method

Post-construction long-term BMP selection must meet Metro’s requirement of an 80% TSS reduction of an average annual urban pollutant load. Nonpoint-source pollution is most prevalent in runoff from small frequent storm events, typically less than 1.1 inches of rainfall; that fact was used in preparing selection, sizing, approach, and maintenance criteria in the BMP fact sheets. Stormwater quality management involves pollutant control, capture, and treatment for new development and redevelopment.

“Long-term BMP selection must be based upon the ability to meet Metro’s requirement of an 80% TSS reduction of an average annual urban pollutant load.”
Section 1.6.1, Page 1-9

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

Temporary BMPs (construction EP&SC / good housekeeping), Permanent / post-construction treatment practices (PTP), Erosion Prevention and Sediment Control (EP&SC / PESC), Contractor activity BMPs (CP, TCP, ICP), Swales, Sediment or detention ponds, Pervious pavers / permeable concrete, Grass-lined channels, Infiltration BMPs, Detention/retention facilities, Vegetated swales/filters, Source controls and perimeter/outfall controls

“Temporary BMPs are intended to address construction activities while permanent BMPs address long-term stormwater management objectives / requirements.... Permanent BMPs may include swales, sediment or detention ponds, and a variety of other features.”
Section 1.5, Pages 1-7 to 1-8