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<br />14 <br /> <br />6. Data Requirements: <br /> <br />UWSR requires the following input data: <br />(1) Number of cross sections and individual reach lengths. <br />(2) Number of subreaches. <br />(3) Locations of tributaries. <br />(4) Cross-section geometries of all computational sections (arranged from <br />upstream to downstream). <br />(5) Manning's roughness coefficient at each cross section. <br />. <br />(6) Boundary conditions specified by either a discharge hydrograph, or a <br />stage hydrograph, or a stage-discharge rating curve. <br />(7) Sediment-transport function. <br />(8) Characteristic parameters for each dam, including its discharge <br />coefficient, width, and height. <br /> <br />7. Model Limitations and Applicability: <br /> <br />The use of UUWSR is limi ted to a model i ng reach for whi ch the one- <br />di mens iona 1 flow app roximati on and steady-state sol uti ons at confl uences and <br />dams are appl icable. However, the model can simulate, with minimal computer <br />cost, a complex river-network system in which islands, branches, meander <br />loops, and tributaries are connected to the main channel. The model can also <br />simulate effects of hydraulic structures such as dikes, locks and dams, etc. <br />The capability of unsteady flow routing of this model enables users to <br />simulate the flood-wave movement in a long reach. <br /> <br />D. HEC-6 (Hydrologic Engineering Centert: <br />1. Developer: William A. Thomas (Hydrologic Engineering Center, Corps of <br />Engineers), 1977 <br />2. Previous Applications: <br />(1) Atchafalaya River Basin, Louisiana (Jennings & Land, 1977) <br />(2) Clearwater River, Idaho (Williams, 1977) <br />(3) Boise River, Idaho (Thomas & Prasuhn, 1977) <br />(4) San Lorenzo River (Jones-Tillson & Associates, 1980) <br />(5) Mississippi River (Nakato & Vadnal, 1981) <br />