When Storm Daniel swept through the port city of Derna in Libya last September, heavy rainfall burst two dams, unleashing a flood that devastated neighborhoods and claimed thousands of lives.
Less than a month after four towering dams on the Klamath River were demolished, hundreds of salmon made it into waters they have been cut off from for decades to spawn in cool creeks.
Pennsylvania American Water finished dredging Roaring Brook after a release of sediment and silt pollution into the waterway.