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<br /> <br />ABSTRACT OF THESIS <br /> <br />STEEP CHANNEL WATER SURFACE PROFILES <br /> <br />A method of calculating a water surface profile in a steep channel <br /> <br />has been developed and a computer program using the method has been <br /> <br />written. The program was checked by using field data from an actual <br /> <br />mountain stream and comparing completed against measured water surface <br /> <br />, <br /> <br />profiles. <br />The computer program, designated program PR~FILE, was developed <br /> <br />after attempts to apply existing programs to the steep channel water <br /> <br />surface profile problem. Difficulties experienced with.three existing <br /> <br />programs included inability to continue computations for large energy <br /> <br />changes between adjacent stream cross-sections, complexity of input, <br /> <br />and utility of output. The problem of large energy changes was solved <br />m <br />by use of an equation, Q = C AH ,to describe flow when an energy <br />s <br />balance could not be achieved. For normal changes of energy between <br /> <br />sections, the Standard Step Method, as used by the U.S. Geological <br /> <br />Survey, was used. <br /> <br />Requirements for input data to the program were formulated so <br /> <br />that entry of field data was simplified to the maximum extent possible. <br /> <br />Data were entered on four types of cards which specified the type of <br /> <br />stream, stream cross sections, stream roughness and discharge conditions <br /> <br />at the initial section. <br /> <br />. <br /> <br />Output was provided on two tables for each section. The first <br /> <br />. <br /> <br />table gave values of area, conveyance, and top width at specified <br /> <br />increments of elevation within the section. The second table gave <br /> <br />iii <br />