![High viewpoint between rocky mountains](/sites/g/files/dgvnsk9956/files/styles/sf_medium_width/public/images/class/Grand%20Canyon%20Winter%202005%2009.jpeg?itok=u_vUjqn4)
Large, multipurpose dams impact the integrity of downstream aquatic and riparian ecosystems. An international effort is underway to evaluate how pulse flow releases might be used as a tool in restoration. An experimental release from Glen Canyon Dam in November of 2004 created a unique opportunity to examine the geomorphic and ecologic response of releases on the health of Grand Canyon ecosystems.