WikiWatershed is a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. WikiWatershed an initiative of Stroud Water Research Center, a global leader in freshwater science.

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Runoff Simulation Guide

The Runoff Simulation shows how land use and soil together determine whether rainfall infiltrates into the soil, runs off into streams or is evaporated and transpired by plants.

1. Introduction

The Runoff Simulation shows results from running the TR-55 runoff model and the Small Storm Hydrology Model for Urban Areas for a single 24-hour rain storm over a hypothetical small unit of land with a single land cover class and a single hydrologic soil group.

2. Adjusting Rainfall Amount

Using the slider you can adjust the level of rainfall within 24 hours from a small rainstorm to a hurricane.

3. Selecting Land Cover Type

A help bubble describing each land cover type will appear as you hover over that land type.

4. Selecting Soil Group

You can select from four hydrologic soil groups defined by the U.S. Department of Agriculture.

5. Reading the Results

As the parameters are selected, the visualization changes but it will always show a cube of land with the land cover on top and the soil type on the sides.

6. Notes About Using the Model

This runoff simulation is only a simplified way of demonstrating the effects of different land cover and soil types on water distribution.

7. Credits

Learn about the collaborating organizations that developed the Runoff Simulation.