A series of storms that ripped through the region last weekend did more than coat the Sierra Nevada with a thin layer of snow. They also sent an estimated 11 billion gallons of water into Lake Tahoe, according to a Facebook post Tuesday from the National Weather Service in Reno. That’s enough water to raise the lake level by more than three inches, according to the weather service. “For reference, that’s roughly equivalent to the average total consumptive water use in a year from the Truckee River by the Truckee Meadows Water Authority,” the weather service reported.