The use of green infrastructure (GI) in the stormwater community is now a preferred methodology to deal with a wide range of stormwater related issues. This talk will focus on green infrastructure projects in different parts of the world that address different aspects of optimization efforts, a major focus for stormwater practitioners today. The first addresses the need to understand the performance of GI to accurately describe the net benefits of a BMP under a wide range of ambient conditions. A key effort to provide this information to the LA region is a five-year GI performance study conducted by the Southern California Stormwater Monitoring Coalition (SMC). This study and the follow-on regional monitoring program has provided an understanding of GI BMPs in southern California’s unique climate. This information is being incorporated into regional models and Reasonable Assurance Analysis (RAAs) efforts as part of multijurisdictional enhanced watershed managements plans (EWMPs) totaling over $30 billion in implementation costs.The second aspect is the development of an optimization tool for the United Kingdom equivalent to GI Sustainable Drainage Systems (SuDS). The presentation will expand on project details and progress made so far in optimizing GI.