An agricultural tile empties water into an Iowa Stream
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Surprising Phosphorus Trends

We now know that total phosphorus concentrations have significantly decreased at a dozen sites on Iowa’s rivers. Phosphorus, along with nitrate, is commonly used as fertilizer; both contribute to nutrients in Iowa’s rivers and streams and ultimately all the way downstream to the Gulf of Mexico.
Tom Stoeffler speaks with Dan Mahoney standing in a river. The water-quality sensor can be seen behind them
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IIHR’s Water-quality Network Grows

Thanks to a network of water-quality sensors deployed and maintained by IIHR—Hydroscience & Engineering, water-quality data is now readily available for many sites in Iowa.
Gabriele Villarini poses in front of the Iowa River
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Villarini to Receive AGU’s Macelwane Medal

Gabriele Villarini was chosen to receive the American Geophysical Union's James B. Macelwane Medal
Students stand in a large cave with a LiDAR scanner
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Exploring Unseen Iowa City

Beneath downtown Iowa City’s Brewery Square lies a network of man-made tunnels and caves that dates from the city’s earliest days