This report was prepared to help utilities, state and municipal agencies, and other storm water professionals understand the potential benefits of their low impact development (LID) and green infrastructure (GI) programs. The objectives are to highlight different evaluation methods that have been successfully applied, and also to demonstrate cases where LID/GI has been shown to be economically beneficial. The intent of this document is to promote the use of LID/GI, where appropriate, to supplement grey storm water infrastructure .