PEWI: Sandbox for Creativity, Tool for Real Change

Have you ever wondered how changes in land use could affect nutrient reduction, habitat for pollinators or soil health? In this month’s webinar, Dr. Lisa Schulte Moore showed us how to use a new tool, People in Ecosystems Watershed Integration (PEWI).

Today, we face water quality issues related to soil erosion, nutrient loss, and water runoff in Iowa and beyond. Many of these problems stem from how our landscape has changed over the last two centuries. One way that we can begin to address these problems is to strategically target land use changes at the watershed scale.

runoff combined 2

Left: real-world challenges like erosion and water runoff; Right: PEWI shows how land use changes pay off

Schulte Moore and her team created PEWI because they wanted a tool that could show people how changes in land use could affect the surrounding area without having to make risky or costly decisions. PEWI gives users a chance to test-drive changes in land use in a 6,000 acre watershed. Each cell in the simulation represents ten acres. Users can choose from 15 different land uses and can simulate crop rotations over a three year period.

Topography, soil drainage, and flood frequency can all be altered to the user’s preference. The tool also considers the impacts of weather and provides a random distribution of weather patterns based on 30 year averages of precipitation in Iowa.

combined features

PEWI does not require any specific software licenses or computer skills. To use PEWI, all users need is the internet. Users can compare different landscape designs and learn about how different mixes of landscapes or even weather patterns might affect conditions in the real world. PEWI can provide estimates for nutrient runoff and erosion. The tool can also score landscapes and compare how different designs meet different goals.


You can view an archived version of the webinar here. Other archived webinars from Iowa Learning Farms are available on our website.

For more information about PEWI, visit the PEWI website.  You can try PEWI for yourself here. Lesson plan ideas, user guides, and tutorials are all available at the PEWI website.

Julie Whitson