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<br />PROGRAM USAGE <br /> <br />8. INTRODUCTION TO PROGRAM USAGE <br /> <br />Problem analysis by simulation is a two step process. First the <br />model is calibrated and verified. Second, the problem analysis <br />is made. <br /> <br />9. SUW~RY OF INPUT DATA <br /> <br />Input data are grouped into four categories as described below. A <br />summary of input variables is contained in exhibit 7, and a detailed <br />description of each variable is contained in exhibit 6. <br /> <br />a. Geometric Data. This category includes cross sections. reach <br />lengths and n-va1ues, existing at the beginning of the study, as required <br />for water surface profile calculations. In addition the movable bed <br />portion of each cross section and the depth of sediment material in the <br />model bed are established. <br /> <br />b. Sediment Data. This category is specified on cards I through <br />o and contains the inf10wing sediment load data, gradation of material <br />in the stream bed and information about fluid properties, and sediment <br />properties. <br /> <br />c. HYdroloQic Data. This category is specified on cards Q <br />through Wand contains water discharges, temperatures and flow durations. <br /> <br />d. OperatinQ Rule. The operating rule is the functional relation- <br />ship between the starting water surface elevations and time. It controls <br />the water surface elevation at the downstream end of the study area and <br />is specified on R cards in the Hydrologic Data. This can be a rating <br />curve or a single elevation. It can be changed at any water discharge <br />in the hydrologic data. <br /> <br />10. ESTIMATING DATA REQUIREMENTS <br /> <br />Estimate the number of cross sections (NR) that will be required to <br />define the study area for water surface profile calculations. Also, <br />determine the number of grain size classifications that are desired <br />for describing the sediment load (NGS). (For example, use bed gradation <br />curves to determine the maximum grain size present in the bed and from <br />table 2 determine the number of size classifications required to define <br /> <br />7 <br /> <br />,._ ';,-_,,,;'~;i.,;;.L;.,",,,."., h':;iLd~:,~~~~i.':/&~'"-;{; 0 . ,,;\./"""~ "-~ oJ ~(,~,..;~t,,"'0,7l~;" '...:& -''';_;''$~;,;-:<t:~;-~;;-~~~,,,, <br /> <br />,__''-.___ _~_ '~'_"-""'-^-'-__ "~:'w,,.,_h-._ , . <br /> <br />'-".,~ _ __, 'c' <br /> <br />.,"~ ~ <br />