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Water Resources



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Water Resources in the Hydrosphere This unit Earth s Water Reservoirs and the Hydrologic Cycle Water As A Resource Surface Groundwater Systems Geology Water Quality Pollution Water Quality Pollution Earth s Water Reservoirs Largest amount of fresh water is stored as ice 98 4 of all unfrozen fresh water is in the groundwater system 97 5 1 81 0 016 The Hydrologic Cycle 0 63 0 001 Water As A Resource Historical View Perpetual Resource Surface Water Renewable or flow resource on a global scale Groundwater Potentially renewable or non renewable stock resource Recoverable No substitute resource for it 1 Whiskey is for drinkin water is for fightin Mark Twain US Water Budget Billions of gallons per day Slightly less than 1 of all the water on Earth is fresh potable water 1250 km2 stored at any one time Continuous flow 40 000 km3 year 6 3 billion people compete for it Is Ample Water Available everywhere No it is unevenly distributed Demand exceeds availability in many areas Variability results from Climate Regions Climate change trend Changing patterns of precipitation Seasonal Random variability Water Distribution Differences in supply related to Average annual precipitation Evapotranspiration Runoff If precipitation evapotranspiration Surface water fills channels infiltrates soils and replenishes groundwater 2 Average Annual Precipitation in U S Potential Evapotranspiration Annually in Inches Ephemeral flow only certain times per year vs How does U S use its water Perennial Streams flow continuously all year 400 billion gal day Domestic Industrial Agricultural World 8 23 69 U S 12 42 46 3 Water Consumption vs Water Use Home 19 Industry 38 Agricult ure 43 Electric Power Industry Irrigation Domestic Use water is returned to stream after use recycled Consumption water lost to atmosphere Agriculture is major consumer Million gal yr Returned 195 000 98 27 800 137 000 25 300 85 24 77 How do you use water Water Use A person needs approximately 1 gallon of water per day for fluid



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