Across California this summer, residents have been racking up water conservation numbers that defy expectations — a 27% reduction in June, followed by 31.3% in July. Perhaps more impressive than the percentage figures, however, is the actual volume of water saved over two months: 414,800 acre-feet. That’s a lot of water — more than twice the amount projected to be available annually from two proposed storage facilities that would cost a combined $3.5 billion to…