National Stormwater Calculator (SWC)
Type(s) of Tool
Country of Origin
The National Stormwater Calculator (SWC) is a software application that allows users to analyze site hydrology for small- to medium-sized locations (less than 12 acres) in the United States and Puerto Rico. The SWC estimates the annual amount of stormwater runoff, based on local soil conditions, land cover, and historic rainfall records and including different development and control scenarios. A cost estimation module and a future climate scenario module are included. The SWC is a resource for all Rainwater Management Credits in LEED by the U.S. Green Building Council for all project types in all rating systems.
The SWC is used to inform site developers on how well they can meet a desired stormwater retention target with and without the use of green infrastructure, including different control scenarios and cost estimation.