Faced with a worsening drought and the ever-present threat of more wildfires, the Bay Area needed a miracle. And last month, it got one. An unexpected and almost unprecedented October deluge gave the Hetch Hetchy reservoir, the primary water supply for San Francisco and most of the Bay Area, a more than 21-foot bump in its water level. That’s an 11% boost; and the prospect of breaking the drought this rainy season suddenly no longer sounds impossible.