MS4 Resources

Note that our website has been updated to replace the term BMP with SCM (Stormwater Control Measure).


UNHSC in cooperation with EPA Region 1 staff have assembled a series of fact sheets that summarize the 10 best management practices and associated performance curves developed for the new MA and NH MS4 permits
SCM Performance Fact Sheets

A cross-walk to assist designers and modelers to match common SCMs identified in the MA and NH Stormwater Manual with the SCMs modeled in the MS4 permit and documented in appendix F
 SCM Crosswalk

SCM Cost estimate approach outlined in a recent EPA Region 1 memo
SCM Cost Estimates

SCM Performance Calculator.  Quantifies water quality performance using the MS4 permit performance curves
SCM Performance Calculator

Simple Municipal tracking form
Simplified tracking and accounting calculator

Street Sweeping Credit Calculator.  Quantifies stormwater credits for TP and TN from measured and modeled street sweeping.
Street Sweeping Credit Calculator

Generic Design Details

Finally, UNHSC has partnered with the Rockingham Planning Commission and the Southeast Watershed Alliance to develop up-to-date stormwater Post-Construction Stormwater Management Standards required in section 2.3.6 of the new NH MS4 permit. 
The original 2012 standards

 In addition, since 2012, numerous municipalities have improved and strengthened the language in the standards through direct experience and continual review of the text.  
Amended Draft Standards 2/19

UNHSC has been assisting the New England Environmental Finance Center in the development and delivery of training sessions to promote the new SCM Performance Curves and the EPA Region 1 Opti-Tool.
Opti-Tool Training