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<br /> <br />Table of Contents <br /> <br /> <br />Abstract ...................................................................... ii <br /> <br />Introduction ................................................................... <br /> <br />Specific Water Problem ....................................................... I <br />Research Objectives .......................................................... I <br /> <br />Determination of Return Flow by Municipalities ...................................... 2 <br /> <br />The Cottonwood District Study -- the Cottonwood Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br />The City of Colorado Springs Study -- the Gronning Line ............................ 3 <br />Controversy concerning the Cottonwood Curve and the Gronning Line. . . . . . . . . . . . . . . . . . 4 <br /> <br />Research Methods .............................................................. 7 <br /> <br />Apparatus and Procedures ..................................................... 7 <br />Data Collection and Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 <br /> <br />Results: Evaluation of Municipalities' Determinations. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . II <br /> <br />Evaluation of the Cottonwood Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II <br />Evaluation of the Gronning Line ............................................... 13 <br /> <br />Results: Evaluation of Small Lysimeters for Consumptive Use .................... . . . . . . 16 <br /> <br />Comparison of Standards ..................................................... 16 <br />Comparison of the Small Lysimeter Types ....................................... 17 <br />Comparison of Small Lysimeters to the Large Lysimeter <br />and the Penman Equation ................................................. 20 <br /> <br />Conclusions .................................................................. 23 <br /> <br />References ................................................................... 24 <br /> <br />iii <br />