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<br />CHANER 3 <br /> <br />CHANER 4 <br /> <br />Falling Groundwater Levels <br /> <br />30 <br /> <br />Surface Water outside the River System <br /> <br />31 <br /> <br />PROBLEMS OF WATER SUPPLY IN THE BASIN <br /> <br />32 <br /> <br />Critical Knowledge Needed 32 <br /> <br />How Much Water Is in the River? 32 <br />Uncertainty in Average-Flow Estimates /32 <br />Explanations of the Uncertainty in Flow Estimates /34 <br />Looking for the Causes of Climatic Fluctuations /35 <br />Searching for Errors in Streamflow Estimates /35 <br />Planning for Extended Periods of Low Flow /36 <br /> <br />Alternatives at Full Utilization 37 <br /> <br />How Can "New" Water Be Obtained? 37 <br /> <br />How Can Water Quality Be Controlled? 39 <br /> <br />THE RANGE OF OBJECTIVES IN PLANNING FOR <br />THE USE OF COLORADO WATER <br /> <br />41 <br /> <br />Diversity, Ambiguity, and Change in Aims 41 <br /> <br />National Economic Efficiency as an Aim 42 <br />A Useful Yardstick /42 <br />Off-Site Costs and Benefits /43 <br />Meeting Wodd Food Demands /44 <br />State Economic Efficiency /45 <br /> <br />Income Redistribution as an Aim 46 <br /> <br />Political Equity as an Aim 48 <br /> <br />Controlling the Natural Environment as an Aim 49 <br /> <br />Preservation and Esthetics as an Aim 50 <br />Preserving a Heritage /50 <br />Preservation of the Colorado River Gorge /51 <br />Dams in or near the Grand Canyon /52 <br />Recreational-Use Valuations Do Not Measure Esthetics /54 <br /> <br />Other Aims 55 <br /> <br />Exploring Alternatives to Achieve These Aims 55 <br /> <br />viii <br />