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<br />40 <br /> <br />Results were obtained with each of the programs, so long as flow <br /> <br />. <br /> <br />conditions remained within the capability of the individual program. <br /> <br />Modeling cross-sectional changes with the USGS program was most <br /> <br />. <br /> <br />cumbersome, as the initial number of points in the cross-section could <br /> <br />not be changed without changing all subsequent cards. In many cases, <br /> <br />this necessitated calculation of a substantial number of intermediate <br /> <br />, <br /> <br />points on a straight slope, a very time consuming requirement. <br /> <br />Insertion of new data for each station was also required to change <br /> <br />. <br /> <br />roughness values. <br /> <br />Cross-sectional changes could be modeled with equal ease in the <br /> <br />USBR and PR~FILE programs. All that was required was to identify the <br /> <br />end points of straight slopes and delete all original cross-sectional <br /> <br />stations beyond the toe of the straight slope. Changes of roughness <br /> <br />. <br /> <br />for the entire reach could be accomplished in the USBR program by use <br /> <br />of a factor, but changes for a sub-reach required that new roughness <br /> <br />. <br /> <br />data for each station in the sub-reach be supplied. Program PR~FILE <br /> <br />required only one card for change of roughness data in a sub-reach. <br /> <br />The time required in man-hours to model a full set of modifications <br /> <br />to 50 stations for each of the programs is shown in Table 4-2. <br /> <br />Table 4-2 <br /> <br />Time requirement in man-hours to model alterations to SO stations <br />(including roughness changes and keypunching) <br /> <br />USGS Program <br /> <br />USBR Program <br /> <br />~FILE Program <br /> <br />19 <br /> <br />10 <br /> <br />9 <br /> <br />. <br />