Taking Measurements of Snowpack (IMAGE) University of Arizona Caption Willem van Leeuwen, a University of Arizona professor of natural resources and the environment, measures snowpack in a "snow pit" along Arizona's Mogollon Rim during a snow survey in 2017. He is taking snow samples at different locations in the snowpack to make precise measurements of snow water equivalent (the amount of water that would result if the snowpack is melted). The measurements also review the history of the snowpack -- what kinds of storms led to the snowpack and what happened to it between storms. Credit Patrick Broxton, copyright 2017 Usage Restrictions The photo <Taking measurements of snowpack> may only be used to illustrate a story about the research described in the accompanying news release," Declining Snowpack over Western US Mapped at a Finer Scale." Please make sure to credit the photo as requested. Do not post this photo independent of the story. 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.