September 30, 2021

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Geosyntec Practitioners Assess Stormwater BMPs for Agricultural Land for the Iowa Nutrient Research & Education Council

Geosyntec’s Adrienne Nemura, P.E. (Ohio), Marc Leisenring, P.E. (Oregon), Rich Wildman, Ph.D. (Oregon), Beth Toot-Levy (Ohio), and Jo Lewis (Oregon) contributed to the project.

Adrienne Nemura is a Principal Water Resources Engineer based in Ohio with more than 36 years of experience focused on helping clients identify cost-effective and sustainable solutions to meet their water quality goals. She has worked for more than 40 cities and wastewater utilities, state and federal regulatory agencies, industrial facilities, airports, attorneys, consulting firms, nonprofit organizations, and trade associations.

Marc Leisenring is a Principal Water Resources Engineer based in Oregon with more than 20 years of experience focused on stormwater master planning, watershed and storm system modeling, environmental data analysis, regulatory compliance, and water quality management.

Rich Wildman is a Project Scientist based in Oregon who focuses on stormwater quality, watershed management, and surface water quality problems. Rich develops numerical models, analyzes data, develops stormwater treatment alternatives to help clients meet their regulatory obligations proactively.

Beth Toot-Levy, is a Project Scientist based in Ohio with more than 20 years of experience in environmental and regulatory compliance. Her expertise includes Clean Water Act compliance, water quality standards, water quality and environmental monitoring, risk communication, watershed management, industrial and municipal pretreatment, and integrated planning.

Jo Lewis is a Staff Professional based in Oregon who contributes to projects ranging from BMP design to analysis of stormwater quality to watershed master planning.

The Iowa Nutrient Research & Education Council (INREC) published Geosyntec’s assessment of the effectiveness of three structural best management practices (BMPs) on reducing stormwater runoff losses from Iowa agricultural land. The study evaluated the effectiveness of pond dams, terraces, and water and sediment control basins.

Geosyntec combined location information with digital elevation models to identify areas treated by the BMPs, which varied widely across Iowa’s geographic regions. Geosyntec found that the number of BMPs and areas treated increased significantly from the 1980s to 2016–2018. This information was combined with estimates of BMP effectiveness prepared by Geosyntec based on a review of literature. The project findings, which were developed collaboratively with INREC’s leadership, suggests a 3.2 percent increase in phosphorus loss reduction between the 1980s and 2016–2018 due to the installation of structural BMPs on agricultural land.

More Information

To learn more about the assessment, visit INREC’s website:
To learn more about water resources management contact Adrienne at This email address is being protected from spambots. You need JavaScript enabled to view it..
* Photo Credit: USDA NRCS