NJ Stormwater Best Management Practices Manual

Stormwater Management rules, N.J.A.C. 7:8 specify stormwater management standards that are mandatory for new major development. The New Jersey Stormwater Best Management Practices Manual (BMP manual) is developed to provide guidance to address the standards in the Stormwater Management rules, N.J.A.C. 7:8. The BMP manual provides examples of ways to meet the standards contained in the rule. The methods referenced in the BMP manual are one way of achieving the standards. An applicant is welcome to demonstrate that other proposed management practices will also achieve the standards established in the rules. The BMP Manual was developed by the New Jersey Department of Environmental Protection, in coordination with the New Jersey Department of Agriculture, the New Jersey Department of Community Affairs, the New Jersey Department of Transportation, municipal engineers, county engineers, consulting firms, contractors, and environmental organizations.

The BMP manual has been drafted to assist review agencies and the regulated community. The methods in the BMP manual can be utilized without need for additional documentation to address the performance standards in the rule. The Department anticipates providing guidance on additional best management practices and new information on already included practices as research and development occurs in this field

Future updates of the BMP Manual will be available through www.njstormwater.org.

Chapter Five: Computing Stormwater Runoff Rates and Volumes presents the mathematical methods for the stormwater runoff rates, volumes, and the stormwater quality and quantity design storms. This chapter also provides information computations for unconnected impervious areas, and also contains an overview of various stormwater pollutant loading models. *** Updated April 2021***

• NOAA C & D distributions

Chapter Six: Groundwater Recharge discusses the groundwater recharge methodology, the groundwater recharge design storm, and the details of the New Jersey Groundwater Recharge Spreadsheet (NJGRS).

• Download the NJGRS in Excel 97 format
• Download the NJGRS in Excel 2002 format

Chapter Nine: Provides general information on Green Infrastructure BMPs that may be used for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity
*** Updated March 2021***

• Chapter 9.1 Cisterns
• Chapter 9.2 Dry Wells
• Chapter 9.3 Grass Swales
• Chapter 9.4 Green roofs
• Chapter 9.5 Manufactured Treatment Devices (GI)
• Chapter 9.6 Pervious Paving Systems
• Chapter 9.7 Small-scale Bioretention Systems
• Chapter 9.8 Small-scale Infiltration Basins
• Chapter 9.9 Small-scale Sand Filters (GI)
• Chapter 9.10 Vegetative Filter Strips

Chapter 10: Provides general information on Green Infrastructure BMPs that may be used for Stormwater Runoff Quantity (or for Groundwater Recharge and/or Stormwater Runoff Quality with a Waiver or Variance from N.J.A.C. 7:8-5.3)
*** New March 2021***

• Chapter 10.1 Bioretention Systems (large-scale)
• Chapter 10.2 Infiltration Basins (large-scale)
• Chapter 10.3 Sand Filters (large-scale GI)
• Chapter 10.4 Standard Constructed Wetlands
• Chapter 10.5 Wet Ponds (GI)

Chapter 11: Provides general information on Non-GI BMPs that may be used for Groundwater Recharge, Stormwater Runoff Quality, and/or Stormwater Runoff Quantity only with a Waiver or Variance from N.J.A.C. 7:8-5.3
*** New March 2021***

• Chapter 11.1 Blue Roofs
• Chapter 11.2 Extended Detention Basins
• Chapter 11.3 Manufactured Treatment Devices (Non-GI)
• Chapter 11.4 Sand Filters (Non-GI)
• Chapter 11.5 Subsurface Gravel Wetlands
• Chapter 11.6 Wet Ponds (Non-GI)

Chapter 12:*** Updated November 2020 *** Soil Testing Criteria

• Download Chapter 12 Soil Testing Workbook

Chapter 13:*** NEW March 2020 ***   Groundwater Table Hydraulic Impact Assessments for Infiltration BMPs

• Download Hantush Excel Spreadsheet