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<br />downstream. The effects of the sediment changes on the hydraulic compu- <br /> <br /> <br />tations are not felt until the following time period. <br /> <br /> <br />The HEC-6 program has the option of doing parallel water surface profile <br /> <br /> <br />computations. In the parallel computation mode, up to ten profiles can be <br /> <br /> <br />run in the same program execution. The sediment calculations are also run <br /> <br /> <br />in parallel, but since all the profiles have already been computed, the <br /> <br /> <br />effects of the sediment computations on the hydraulic geometric data are <br /> <br /> <br />not taken into account until the next set of parallel computations are <br /> <br /> <br />completed. The graphics program will only be able to reflect the results <br /> <br /> <br />at the end of the parallel computations. <br /> <br />, <br /> <br />2. HEC-6 Graphics Input Requirements <br />The graphics program requires additional user input data when HEC-6 <br />is being used, that is not required when running HEC-2 or GEDA data. This <br />additional input is required because of the large number of profiles that <br />are typical of an HEC-6 computer run. The user is required to provide <br />the graphics program with the number of profiles and which profiles <br />(time periods) he wishes to graphically display. This is required input <br />for both batch or interactive when HEC-6 tape 95 input is being used. <br />The input format for this required input is free format. The user is <br />restricted to ten profiles (time periods) when plotting the cross sections <br />and to forty-six profiles when using the profile graphics package. This <br />restriction is due to the limited size of the plotting arrays in the <br />graphics program. It is therefore important that the user know which <br />ti~e periods are of interest before the graphics program is executed. <br /> <br />, <br /> <br />2 <br />