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<br />22 <br /> <br />. <br /> <br />to handle critical flow situations, flow through bridges, and to carry <br />out roughness calculations based on observed profiles. Other options <br /> <br />provide for incremental discharges at stations along the stream, <br /> <br />sedimentation deposits, and tabulation of hydraulic properties. Of <br /> <br />all the government programs, the USBR program has the greatest ease <br /> <br />of data entry. Entry of cross-sectional and stationing data is <br /> <br />straightforward, as is specification of options. The only possible <br />improvement in data entry would be to reduce the requirement for <br /> <br />roughness cards at each cross-section. Roughness is expressed in <br /> <br />the same manner as in the USCE program. Although the output for this <br /> <br />program is quite readable, its excessive length results in a rather <br /> <br />voluminous output. Past experience has indicated a cost for page <br /> <br />printing in excess of the cost of computer time. Volume of output <br /> <br />notwithstanding, however, the program appears to be the most compact <br /> <br />and easiest to use for the wide range of computational services avail- <br /> <br />able. Computation proceeds station by station. Initial energy con- <br /> <br />ditions are specified by water level elevation at the starting station. <br /> <br />Where flows are near the critical level and energy at the section under <br /> <br />solution cannot be satisfactorily determined, a critical flow routine <br /> <br />is called. This routine will establish a new energy level which will <br /> <br />allow normal computations to continue. During computations, sections <br /> <br />may be altered by a sedimentation specification, which replaces channel <br /> <br />elevations by the elevation of a ficticious sediment layer. Incremented <br /> <br />discharges may be included by specifying discharge and energy level of <br />the tributary flow. <br /> <br />Besides the computer programs developed by governmental agencies, <br /> <br />at least two other water surface profile programs developed by <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />I <br /> <br />. <br /> <br />f <br />