After enduring a harsh five-year drought, California got drenched by historic, torrential rain this winter. Yo-yoing between extreme stretches of parched and sodden will become more common in a warmer world. And climate is far from the only change facing California — technology is transforming the state’s economy, while immigrants continue to reshape its cultural fabric. As these forces converge, residents are coping with water shortages in some surprising ways. Where trend-setting California goes, the rest of the country may follow. Emma Foehringer Merchant dives into the Golden State’s new age of water management.