Green Values Stormwater ToolboxA project of the Center for Neighborhood Technology, site has a Stormwater Management Calculator, a tool for quickly comparing the performance, costs, and benefits of Green Infrastructure, or Low Impact Development (LID), to conventional stormwater practices. Learn what green infrastructure is and does. Understand the costs and benefits of using green infrastructure to mitigate the need for different types of built water infrastructure, such as sewers and detention basins.