National Stormwater Calculator (SWC)

National Stormwater Calculator (SWC)

Organization

Environmental Protection Agency of the United States of America - EPA

Type(s) of Tool

Modelling Tools

Sector(s)

Water and Sanitation

Lifecycle Phase(s)

Project Planning, Concept Design, Detailed Design

Open Source

Yes

Language Availability

English

Country of Origin

USA

Description

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.

Tool Outcome

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.