BMP Calculations

Understanding how BMPs are calculated will help the user maximize their load reductions. The following topics are addressed in Section 6 Best Management Practices of the Model Documentation: BMP types, BMP groups and sequence of calculation, overlapping and mutually exclusive BMPs, calculation steps with example calculations, and tips for maximizing load reductions.


Each BMP is developed following a Protocol that was approved by the Chesapeake Bay Program Partnership. The Protocol and detailed reports for each BMP are available at the links below. A Quick Reference Guide provides general information about a BMP and how it functions within the Chesapeake Bay Program reporting and modeling structure. This Guide provides a single place to learn key information about most BMPs. 


A crosswalk of commonly-used BMP names to the CAST BMP name may be helpful in selecting the CAST BMP that best represents your management action. The NRCS practice codes and names are also available in the NRCS-CAST file.