National Stormwater Calculator

U.S. Environmental Protection Agency

Launch
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Overview

This software application tool estimates the annual amount of rainwater and frequency of runoff at a specific site using green infrastructure as low-impact development controls.

National Stormwater Calculator Homepage

Features

  • Analyzes site hydrology for small- to medium-sized locations (less than 12 acres)
  • Accesses several national databases that provide soil, topography, rainfall, and evaporation information for a chosen site
  • Shows how runoff may vary based on historical weather and potential future climate conditions