WikiWatershed is an initiative of Stroud™ Water Research Center. The Stroud Center seeks to advance knowledge and stewardship of freshwater systems through global research, education, and watershed restoration.

1. Introduction

Last updated on 2022-04-28

The Runoff Simulation animates results from applying the TR-55 runoff model developed by the U.S. Department of Agriculture and the Small Storm Hydrology Model for Urban Areas developed by Robert Pitt 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.

The Runoff Simulation is available online through the Innovative Technology in Science Inquiry (ITSI) portal or in any web browser at https://runoff.modelmywatershed.org/.

When you run the full Model My Watershed Site Storm Model application, the exact same calculations are happening on every single pixel of the map and are being added together to calculate what is happening for a whole map area. Please note that although the look of the graphics of the model may have changed from the time this walkthrough was created, the placement and functionality of the controls will not change.

The complementary Model My Watershed Site Storm Model performs the same model calculations for a selected land area within the continental United States by using actual land cover and soil data for the selected land area.

There is an additional resource available at that explains in-depth technical details about the models.

Note: Model My Watershed web applications are under active development and the appearance of screenshots will change over time. Updates to this guide will be released with major changes to the user interface.


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