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New Hampshire Stormwater Manual
Note: Please check this webpage frequently for any changes or updates to the manual.

The New Hampshire Stormwater Manual was developed in 2008 as a planning and design tool for the communities, developers, designers and members of regulatory boards, commissions, and agencies involved in stormwater programs in New Hampshire.

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The manual is issued in three volumes:

Volume 1: Stormwater and Antidegradation (18.3 MB) presents an overview of New Hampshire's stormwater program together with related federal program requirements, describes New Hampshire's antidegradation provision (Env-Wq 1708) with respect to controlling water quality impacts due to stormwater discharges, and provides an introduction to the non-structural and structural measures for managing stormwater. Web version and hard copy available.

Volume 2: Post-Construction Best Management Practices Selection and Design (43.9 MB) presents a detailed description of the structural BMPs applicable for use in New Hampshire for the prevention, control, and treatment of stormwater. Web version only.

Volume 3: Erosion and Sediment Controls During Construction (18.4 MB) presents a selection of practices applicable during the construction of projects to prevent adverse impacts to water resources as a result of land-disturbance activities. Web version only.

Hard copies of Volume 1: Stormwater and Antidegradation are also available to order through the DES Public Information and Permitting Unit. To order, please contact them at (603) 271-2975 or info@des.nh.gov.

To assist users, the manual is available in two versions for downloading and printing:

Complete Volumes:

By Chapter:

Volume 1: Stormwater and Antidegradation

Cover and Table of Contents (1.03 MB)
Chapter 1 Introduction (1.31 MB)
Chapter 2 Message for Municipalities (1.46 MB)
Chapter 3 Fundamentals of Stormwater Management (1.02 MB)
Chapter 4 State and Federal Permitting Programs (2.77 MB)
Chapter 5 Antidegradation (5.40 MB)
Chapter 6 Non-Structural Site Design Techniques (2.64 MB)
Chapter 7 Introduction to Best Management Practices (1.66 MB)
Chapter 8 Pollutant Loading Calculations (482 KB)
Appendix A Example Deed Restriction Template (176 KB)
Appendix B Example Drainage Easement Language (212 KB)
Appendix C Deicing Application Rates and Documentation Form 177 KB)
Appendix D Typical Stormwater Pollutant EMCs 294 KB)
Appendix E BMP Pollutant Removal Efficiency 419 KB)

Volume 2: Post-Construction Best Management Practices Selection and Design

Cover and Table of Contents (1.80 MB)
Chapter 1 Introduction (1.34 MB)
Chapter 2 Design Criteria (8.33 MB)
Chapter 3 Screening and Selecting Best Management Practices (1.86 MB)
Chapter 4 Designing Best Management Practices (30.5 MB)
 (due to the large size of Chapter 4 following sections are also available for individual download)
Section 4-1 Low Impact Development (LID) “Interception Practices” (1.21 MB)
Section 4-2 Source Control BMPs (719KNB)
Section 4-3 Treatment Practices (22.4 MB)
Section 4-4 Pretreatment Practices (2.62 MB)
Section 4-5 Groundwater Recharge Practices (136 KB)
Section 4-6 Conveyance Practices (3.95 MB)
Chapter 5 Operation, Maintenance, Inspection & Source Control (594 KB)
References (307 KB)
Appendix A New Hampshire Rainfall Tables (184 KB)
Appendix B BMP Pollutant Removal Efficiency (370 KB)
Appendix C New Hampshire Reservoir and Dam Safety Standards: Defining a Dam (248 KB)

Volume 3: Construction Phase Erosion and Sediment Controls

Cover and Table of Contents (1.38 MB)
Chapter 1 Introduction (1.01 MB)
Chapter 2 Regulation & Permitting (1.51 MB)
Chapter 3 Planning & Selecting Erosion & Sediment Controls (3.0 MB)
Chapter 4 Construction Phase Erosion & Sediment Controls (11.8 MB)
 (due to the large size of Chapter 4 following sections are also available for individual download)
Section 4-1 Erosion Control Practices (5.08 MB)
Section 4-2 Sediment Control Practices (6.29 MB)
Section 4-3 Winter Weather Stabilization & Construction Practices (341 KB)
Section 4-4 Erosion and Sediment Control Monitoring (272 KB)
Appendix A References (133 KB)
Appendix B Sample Inspection Report (231 KB)

 

 

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NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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