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Figure <br />No. <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />LIST OF FIGURES <br />Figure <br />Page No. <br />Platte River Basin and Subbasins......... <br />3 <br />Platte River Basin Study Organization .... <br />5 <br />The Planning Process ................... <br />8 <br />Platte Basin Study Area .................. <br />13 <br />Topographic Regions of Nebraska ....... <br />14 <br />Land Elevations ......................... <br />15 <br />Pleistocene Deposits and Ogallala <br />Formation ............................ <br />16 <br />Alternate Sources of Ground Water ...... <br />17 <br />Normal Annual Precipitation ............. <br />18 <br />Normal Monthly Precipitation .............20 <br />Average Annual Gross and Net Lake <br />National Economic Development Plan <br />Evaporation .......................... <br />21 <br />Soil Regions ............................ <br />21 <br />Current and Projected Populations ....... <br />26 <br />Distribution of Employment .............. <br />27 <br />Historical Earnings and Income .......... <br />28 <br />Total Projected Earnings and Income..... <br />28 <br />Monthly Flows of Major Rivers — 1970 <br />Conditions ........................... <br />49 <br />Modeled Areas .......................... <br />52 <br />Potential Well Yield ...................... <br />54 <br />Ground Water Level Changes ............ <br />57 <br />Registered Irrigation Wells ............... <br />64 <br />Lands Most Suitable for Irrigation ........ <br />65 <br />Methods of Simulating Varying <br />Development Rates ................... <br />66 <br />Ground Water Level Declines by 2020 — <br />Low Projection ....................... <br />68 <br />Ground Water Level Declines by 2020 — <br />Environmental Quality Plan — Lower <br />High Projection ....................... <br />69 <br />xi <br />26 Treatment Needs for Cropland, Pasture <br />Page <br />and Rangeland ....................... 79 <br />27 <br />Projected Adequately Treated Crop, <br />Pasture, and Rangeland ............... <br />81 <br />28 <br />Location of Electric Power Plants — 1970. 85 <br />29 <br />Location of Major Concentrations of <br />Wetland Areas ........................ <br />98 <br />30 <br />National Economic Development Plan <br />— <br />Elkhorn Subbasin .....................118 <br />31 <br />National Economic Development Plan <br />— <br />Loup Subbasin .......................122 <br />32 <br />National Economic Development Plan <br />— <br />Upper Platte Subbasin ................125 <br />33 <br />National Economic Development Plan <br />— <br />Lower Platte Subbasin ................129 <br />34 <br />Environmental Quality Plan — Elkhorn <br />Subbasin . ............................141 <br />35 <br />Environmental Quality Plan — Loup <br />Subbasin . ............................147 <br />36 <br />Environmental Quality Plan — Upper <br />Platte Subbasin .......................153 <br />37 <br />Environmental Quality Plan — Lower <br />Platte Subbasin .......................159 <br />38 <br />Elkhorn Subbasin Recommended Plan <br />...178 <br />39 <br />Loup Subbasin Recommended Plan ......186 <br />40 <br />Upper Platte Subbasin Recommended <br />Plan ..... ............................193 <br />41 <br />Lower Platte Subbasin Recommended <br />Plan ..... ............................202 <br />