NH Stormwater Manual

 

NH stormwater manual 2025 cover

 

 

 

Click to download the NH Stormwater Manual 2025

 

 

 

 

 

Resources: 

Template for updating municipal stormwater regulations: 

Stormwater Management Standards

UNHSC developed the watershed protection standard calculator to assist with determining SCM sizing to meet the WPS: 

UNHSC Watershed Protection Standard Calculator 

Training: 

A recording of the 2025 updated NH Stormwater Manual informational session can be found here: recording of informational session. The recording is of a virtual meeting that reviewed changes made to the manual, and highlighting key contributors who helped with this process. 

July 22, 2025 NH Stormwater Manual Training: Stormwater Manual Outreach Sessions