February 2019 - Dams in rivers provide hydro-power energy, secure water for irrigation, and help protecting against floods. But dams also disrupt river flow regimes and connectivity, with negative consequences for biodiversity and ecosystem functioning. To better understand the benefits and trade-offs of dams worldwide, we need accurate information on the number of dams and their locations. We took up this challenge with the dam and reservoir inventory project (DRIP): a crowd-sourcing project to compile a global atlas of dams. So we need your help!