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WQIag - A Tool of Multiple Applications

Participants will learn about WQIag and its application by different state and federal agencies.

Conceptualized and developed by the USDA NRCS National Water Quality and Quantity Team, WQIag - Water Quality Index for Runoff from Agricultural Fields is a qualitative, multivariate metric that ranks the combined impact of soil and site characteristics, climate, and management practices on the quality of surface runoff leaving agricultural fields. The tool incorporates the impact of six components (Field Physical Sensitivity Factors, Nutrient Management Factors, Tillage Management Factors, Pest Management Factors, Irrigation/Tile Drainage Management, and Conservation Practices) in arriving at the overall index value. The tool provides a quick assessment of agricultural runoff water quality (ranking of 1 to 10; 10 being the best) that incorporates professional knowledge and local preferences through weighting factors.

Harbans Lal
Environmental Engineer
USDA NRCS National Water Quality and Quantity Team

Steven G. Hefner
State Water Quality Conservationist
USDA NRCS Missouri

James Klang, P.E.
Senior Project Engineer
Kieser and Associates, LLC



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The Extension Foundation was formed in 2006 by Extension Directors and Administrators. Today, the Foundation partners with Cooperative Extension through liaison roles and a formal plan of work with the Extension Committee on Organization and Policy (ECOP) to increase system capacity while providing programmatic services, and helping Extension programs scale and investigate new methods and models for implementing programs. The Foundation provides professional development to Cooperative Extension professionals and offers exclusive services to its members. In 2020 and 2021, the Extension Foundation has awarded 85% of its direct funding back to the Cooperative Extension System, 100% of funds are used to support Cooperative Extension initiatives. 

This technology is supported in part by New Technologies for Agriculture Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture and membership funding. Any opinions, findings, conclusions, or recommendations expressed in the content are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. For more information, please visit extension.org. You can view the terms of useat extension.org/terms.

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