Fresh Water Cycle of Biosphere and Runoff Supplies Growing population Demand

 

River Runoff Supplemented by Groundwater, Surface and Reservoir Storage

 

Glacier and Ocean Water Uneconomic to Supplement Fresh Runoff and Groundwater

 

Drip Irrigation Enhanced with Meters, Sensors, Monitors Can Save Half of 70% Agriculture Water Use

 

California Water Supply Tied to Winter Snow and Runoff to Reservoir Storage

 

 

1900-25 California Water Supplemented by Hetch Hetchy and Owens Valley Water Systems

 

1930+ Colorado River Water and 1935+ Central Valley Project Water

 

1950+ California State Water Projects Supplements Early Federal and City Water Projects

..

 

Critical Balance of Maintaining California Delta Before Moving More Water South

..

 

Mississippi Most Extensive of US River Systems, Challenge of Flood Control, Dead Zone, Ogalalla Aquifer

 

Amazon Basin and Guarani Aquifer Supply Most of South America Fresh Water, Threat of Overuse and Deforestation

 

Over 3 Billion People in Asia Rely on Himalayan Glaciers and Monsoons for Fresh Water

 

Enormous Dams and Water Projects in China to Move Himalayan Water North

 

40% East Asian Water Flows North to Arctic Largely Unused, Aral Environment Disaster

 

Water Always Biggest Challenge of Mid East and Africa

 

Energy Require for Deslination is Cost Effective Only in Desert Where Few People Live