Even after years of drought, Sacramento’s biggest worry over water is flood risk. The city is widely considered the second-most flood-prone major city in America, after New Orleans. Sacramento’s efforts to fight flooding got a major boost Thursday. The U.S. Army Corps of Engineers and Rep. Doris Matsui’s office announced that the region has been allocated nearly $1.8 billion to strengthen levees and raise Folsom Dam. The federal money also will be spent widening the Sacramento Weir, a mechanism north of the city that acts as a safety valve by channeling flood waters into the Yolo Bypass.