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EPA National Stormwater Calculator

The National Stormwater Calculator (SWC) can be used to estimate the amount and frequency of rainwater runoff from sites anywhere in the United States. The calculator accounts for soil conditions, rainfall history, land cover, and more.   READ MORE

How To: Urban Forestry and Water Quality Assessment Tools

This presentation provides guidance for using CITYGreen, i-Tree Hydro, EPA’s Stormwater Management Model, and the Western Washington Hydrology Model.  The document describes each system, what inputs are needed, level of expertise required, and how outputs are generated. This resource is useful primarily as introduction to calculators. READ MORE

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