Massachusetts

Massachusetts Stormwater Management Handbook

StateMassachusettshighNo

Fields not found in document: document_metadata.adoption_or_effective_date

Other manuals in Massachusetts: Boston Water and Sewer Commission

Document Metadata

Jurisdiction level

state

“The Massachusetts Department of Environmental Protection (MassDEP) is responsible for implementing the Stormwater Management Standards under the Massachusetts Clean Waters Act”
Page 1-1

State

Massachusetts

“Hardwick, MA”
Page iv

Version / edition

Third Edition

“This is the third edition of the Massachusetts Stormwater Handbook.”
Page ix

Adoption / effective date

Not found in document

No evidence cited

Last revised date

2023-12

“December 2023”
Page i

Relationship to state manual

independent

“The Massachusetts Department of Environmental Protection (MassDEP) is responsible for implementing the Stormwater Management Standards under the Massachusetts Clean Waters Act, M.G.L. c. 21, §§ 26-53, and the Wetlands Protection Act, M.G.L. c. 131, § 40.”
Page 1-1

Design Criteria

Design storm return periods (years)

2-year, 10-year, 100-year

“The post-development peak discharge rate must be designed to be equal to or less than the pre-development rate from the 2-year, 10-year, and 100-year 24-hour storms”
Page 2-5

Water quality volume method

calculated as the required runoff depth multiplied by the total post-construction impervious site area

“Water Quality Volume (WQv) is the runoff volume requiring treatment – it is calculated as the required runoff depth multiplied by the total post-construction impervious site area.”
Page 2-14

Peak flow calculation method(s)

NRCS Technical Release WinTR20 Project Formulation Method, WinTR55 Small Watershed Hydrology Method

“The peak discharge rate computations must be conducted using the NRCS Technical Release WinTR20 Project Formulation Method (Version 3.20 or later versions are permissible) or WinTR55 Small Watershed Hydrology Method (Version 1.00.10 or later versions are permissible).”
Page 2-5

Required hydrologic/hydraulic software

WinTR-20, WinTR-55, MODFLOW

“WinTR20 Project Formulation Method (Version 3.20 or later versions are permissible) or WinTR55 Small Watershed Hydrology Method (Version 1.00.10 or later versions are permissible).”
Page 2-5

Approved BMP categories

Non-Structural, Structural Pretreatment, Structural Treatment, Structural Conveyance, Structural Infiltration, Structural Other

“Non-Structural Street Cleaning ESSD Credits Structural Pretreatment Deep Sump Catch Basin Oil/Grit Separator Proprietary Separator Sediment Forebay Vegetated Filter Strip Structural Treatment Bioretention Area Constructed Stormwater Wetland Extended Dry Detention Basin Gravel Wetland Proprietary Media Filter Sand/Organic Filter Tree Box Filter Wet Basin Roof Dripline Filter Structural Conveyance Drainage Channel Grass Channel Water Quality Swale Structural Infiltration Dry well Infiltration Basin Infiltration Trench Leaching Catch Basin Porous pavement Subsurface Infiltrator Structural Other Dry Detention Basin Green Roof Rain Barrels & Cisterns”
Page 2-18