English: A series of ponds collects runoff water at the excavation site for the Folsom Dam auxiliary spillway in Folsom, Calif., March 15, 2012. The runoff water from the excavation site is treated, monitored and filtered before being pumped into Folsom Lake. The spillway, scheduled to be ready for use in 2017, will allow Folsom Dam to release water sooner and more safely. The project is part of the Folsom Dam Joint Federal Project, a joint effort of the U.S. Army Corps of Engineers Sacramento District, the U.S. Bureau of Reclamation, the Central Valley Flood Protection Board and the Sacramento Area Flood Control Agency to improve the safety of the dam and reduce flood risk for the greater Sacramento area. (U.S. Army photo by Michael J. Nevins/Released)