A study released in May, The Magnitude of California’s Water Challenges, anticipated annual statewide water supply losses in the coming decades as follows: ending groundwater overdraft 2-3 million acre-feet (MAF), less from the Colorado River 0.5-0.8 MAF, climate change 1-3 MAF, and increases to required environmental flows 1-2 MAF. The total losses? 4.6 to 9 MAF per year. It’s easy enough to quibble over these estimates, but a more productive response is to propose ways we can sustainably harvest more water in California. So that’s what we have done.