In the years before California’s drought, it wasn’t unusual for Sacramentans to spend winters worrying about floods. After more than five years with little rain, the past two weeks delivered a bracing reminder that the region remains vulnerable to rising waters and overtopped levees. The recent rainstorms flooded scattered sections of greater Sacramento, from the Garden Highway north of downtown to the rural communities south of Elk Grove. Three small levee breaches added to the havoc caused by the wayward Cosumnes River.