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<br />001241 <br /> <br />v <br /> <br />CONTENTS <br /> <br />Common ~rrors and limitations.--Continued <br />Evapotranspiration ..................., <br />General.considerations ................ <br />H.eth9ds of measurement .. . . . . . . . . . . . . . . Ii <br />W.ter-loss methods . . . . . . . . . . . . . . . . . <br />Evapotranspiration tanks ..... . . . . . . . <br />Soil-water budgets .........,..., <br />Water-table fluctuations . . . . . .. .... <br />Inflow-outflow budgets ... ........ <br />Seepage runs .... . . . . . . . . . . . . . . <br />Evapotranspiration tent .. . . . . . . . . <br />Evaporation as an index of evapotranspiration . . <br />Aerodynamic and energy-balance methods .... . . . <br />Atmospheric flux. .. . . . . " . . . <br />Energy-budgets ... .'.' .. ....... <br />Empirical formulas ..,. .. ........... <br />Blaney-Criddle formula ... ........... <br />Thornthwaite fonnula ,.............. <br />Penman formula ..... ......,...... <br />Munson or P. E. formula. . . . . 0' . . . . . . . . . <br />LOWt'y'-Johnson fonnula . . . . . t . . "' . . . . . . . <br />Extrapolation of measurements to growth areas . . . . . . <br />References. cit~d ... ............... <br />stream.flow . . . . .. ... .............. <br />Gage height (stage) . . . <br />Stags-discharge rslationship . . . . . . . . . . . <br />The ideal control . . . .. . . .. .......... <br />Unstable controls in general . . . . . . . . . <br />Alluvial channels . . . .... . . . . . . . . . <br />Unsteady (fluctuating) flow ............ <br />Flood flows . . . . .... . . . . . . . . . <br />Ice effects . . . . . ... " . . '" . . .. '" , . . . .. . . <br />Surface velocities ... ... .. ."...." <br />References cited .. .. III .. . . " . . . . <br />Reservoirs and lakes . . . . , . . .. . e <br />Same general:considerations .. .. .. . . . . . . . . . <br />Records of storage ..... ... ... ........ <br />Capacity tables . . . .. . . . . . . . . . . . .. . . . <br />Systematic errors in principal gage ..... . . <br />Wind-generated "tides" .... ... ...... <br />Slope owing to through-flow ....... . . . . <br />Infiow ............................. <br />Outflow . . . . . . . ... . . . . . . . . . . . . . . . . <br />Stratification and overturn . . .. .......... <br />Loss by' evaporations ... . . . . . . . . . . . . . . . . . <br />Referenoes oited .... . . . . . . . . . . . . . , . . <br /> <br />. . <br /> <br />. . . <br /> <br />. .. . . .. <br /> <br />. . . . <br /> <br />';.' <br /> <br />Page <br /> <br /> <br />" <br />" <br />" <br />~6 <br />$6 <br />S8 <br />S8 <br />S9 <br />60 <br />60 <br />61 <br />61 <br />61 <br />62 <br />62 <br />63 <br />64 <br />6S <br />66 <br />66 <br />66 <br />67 <br />70 <br />70 <br />71 <br />71 <br />71 <br />72 <br />72 <br />73 <br />7S <br />7S <br />76 <br />77 <br />77 <br />78 <br />78 <br />79 <br />80 <br />80 <br />81 <br />82 <br />83 <br />84 <br />86 <br />