Skip to main content
U.S. flag

An official website of the United States government

Media Alert: Second Round of USGS Dye-Tracing Study on the Kansas River Begins This Week

April 28, 2021

U.S. Geological Survey and partners will inject a harmless, bright red fluorescent dye into the Kansas River on April 29, weather permitting. The study is being done by the USGS in cooperation with the Kansas Water Office, Kansas Department of Health and Environment, The Nature Conservancy, City of Manhattan, City of Topeka, City of Olathe, City of Lawrence, and WaterOne.

The Kansas River provides drinking water for multiple cities in northeastern Kansas and is used for recreational activities. This dye-tracing study will provide a better understanding of how quickly water flows from one location to another. Water-resource managers use this information to effectively respond to potential critical events such as harmful algal blooms or contaminant spills that may make the water unsafe for the public to use. The first segment of this study occurred in late September 2020.

“Recent events with spills above intakes in rivers have pointed out the need for travel-time data to monitor and respond appropriately,” said Tom Stiles, Bureau of Water Director at the Kansas Department of Health and Environment. “With so many people dependent upon surface water supplies in Kansas, understanding how those rivers move is critical to proper water management.”

The red dye—known as Rhodamine Water Tracer (WT)—will be injected into the Kansas River during low, medium and high-flow conditions in Manhattan, Topeka and Eudora throughout this study. The injection will occur at Eudora, Kansas on April 29. The dye will pass out of the river on April 30. The red-hued dye may be visible to the public as it moves downstream. Scientists will measure the amount of dye using instruments in the stream and laboratory analyses.

The potential of a contaminant being accidentally spilled into a river upstream from water users is a possible although minimal risk. The ability to predict the time it will take for a contaminant to reach a specific location is needed so that water-resource managers and municipal water suppliers can appropriately respond. Knowledge of streamflow speeds and travel times may greatly aid in proactive adjustment of water-treatment plans and public notice of unsafe water-quality conditions.

“Results can be used by resource managers to make informed decisions during a hazardous event that may affect water resources and public-water supplies,” said Chantelle Davis, USGS scientist. “Understanding how water moves within the Kansas River is critical in helping decision makers protect lives and property within our community.”

dye in Yellowstone River
McCarthy, P.M., 2009, Travel times, streamflow velocities, and dispersion rates in the Yellowstone River, Montana: U.S. Geological Survey Scientific Investigations Report 2009-5261, 25 p.

Rhodamine WT, which has been used in hydrologic studies for decades, is approved for use as a water tracer by the U.S. Environmental Protection Agency and is harmless to people, fish and plants at the concentration being used for this study. No impact to boats in the river is expected during or after the dye injection


Get Our News

These items are in the RSS feed format (Really Simple Syndication) based on categories such as topics, locations, and more. You can install and RSS reader browser extension, software, or use a third-party service to receive immediate news updates depending on the feed that you have added. If you click the feed links below, they may look strange because they are simply XML code. An RSS reader can easily read this code and push out a notification to you when something new is posted to our site.