New York State

STORMWATER MANAGEMENT DESIGN MANUAL

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Other manuals in New York: New York City, New York State

Document Metadata

Jurisdiction level

state

“New York State Department of Environmental Conservation”
Title Page

State

New York

“Albany, NY 12233”
Title Page

Version / edition

July 31, 2024

“July 31, 2024”
Title Page

Adoption / effective date

2024-07-31

“July 31, 2024”
Title Page

Last revised date

2024-07-31

“July 31, 2024”
Title Page

Relationship to state manual

independent

“The New York State Stormwater Design Manual is prepared to provide standards for the design of the Stormwater Management Practices”
Preface

Design Criteria

Design storm return periods (years)

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

“1-year, 2-year, 10-year, and 100-year”
Table 4.1

Water quality volume method

90% Rule: WQv (acre-feet) = (P * Rv * A) / 12, where Rv = 0.05 + 0.009(I)

“90% Rule: WQv (acre-feet) = (P * Rv * A) / 12”
Table 4.1

Peak flow calculation method(s)

TR-55, TR-20

“TR-55 and TR-20 (or approved equivalent) shall be used to determine peak discharge rates.”
Section 4.6

Required hydrologic/hydraulic software

USDA NRCS TR20, HydroCAD, Pond Pack, StormCAD, Hydraflow, HEC-HMS

“Hydraulic and hydrologic modeling software, such as USDA NRCS TR20, HydroCAD, Pond Pack, StormCAD, Hydraflow, and Hydrologic Engineering Center Hydrologic Modeling System (HEC-HMS) and others, shall be used”
Section 4.9

Approved BMP categories

Stormwater Ponds, Stormwater Wetlands, Infiltration Practices, Filtering Practices, Open Channel Practices

“Acceptable practices are divided into five groups, including: I. Stormwater Ponds... II. Stormwater Wetlands... III. Infiltration Practices... IV. Filtering Practices... V. Open Channel Practices”
Section 3.3.1