Nearly one in 10 U.S. watersheds is 鈥渟tressed,鈥 with demand for water exceeding natural supply, according to a new analysis of surface water in the United States. What鈥檚 more, the lowest water flow seasons of recent years鈥攖imes of great stress on rivers, streams, and sectors that use their waters鈥攁re likely to become typical as climates continue to warm.