Puerto Rico Stream Sensor Study (IMAGE) University of New Hampshire Caption Aquatic sensors are used in streams like this one, Quebrada Sonadora, which is one of the study sites in the Luquillo Mountains of Puerto Rico where researchers monitored nitrate levels before and after Hurricanes Irma and Maria. Credit William McDowell/UNH Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.