The District Department of Transportation (DDOT) and the Department of Energy and Environment (DOEE) in Washington, D.C. have identified four sub-watersheds located within the Anacostia watershed to be retrofitted with GI practices as part of their long-term stormwater management solution to improve the water quality and overall conditions of the affected tributaries. This presentation will summarize various aspects of a planning and design project implementing over 40 individual GI practices within these sub-watersheds. An innovative GIS-based screening tool was developed using open source and utility GIS data together with system prioritization criteria to identify the optimal locations for GI systems and opportunities for impervious area removal. The large analysis area necessitated the use of this type of tool to help rank and prioritize potential locations for GI implementation without having to manually analyze each location.