Water supply and runoff efficiency has been quite stable over the past 50 years, according to charts in that article. The main factor in shrinking is that our w

Water supply and runoff efficiency has been quite stable over the past 50 years, according to charts in that article. The main factor in shrinking is that our water usage has ramped up dramatically as population and agriculture demands grow. One approach might be to implement surcharges associated with water from these reservoirs, to reduce economic viability of overuse, and create incentives to enable other sources of water.