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<br />Chapter 1 Introduction <br /> <br />1-4 <br /> <br />The sediment transport potential is computed by grain size fraction, thereby <br />allowing the simulation of hydraulic sorting and armoring. Major features <br />include the ability to model a full network of streams, channel dredging, <br />various levee and encroachment alternatives, and the use of several different <br />equations for the computation of sediment transport. <br /> <br />The model is designed to simulate long-term trends of scour and deposition <br />in a stream channel that might result from modifying the frequency and <br />duration of the water discharge and stage, or modifying the channel <br />geometry. This system can be used to evaluate deposition in reservoirs, <br />design channel contractions required to maintain navigation depths, predict <br />the influence of dredging on the rate of deposition, estimate maximum <br />possible scour during large flood events, and evaluate sedimentation in fixed <br />channels. <br /> <br />Data Storage and Management <br /> <br />Data storage is accomplished through the use of "flat" files (ASCII and <br />binary) and the HEC Data Storage System (HEC-DSS). User input data is <br />stored in flat files under separate categories of project, plan, geometry, steady <br />flow, unsteady flow, and sediment data. Additional input, such as time series <br />and paired function data, can also be stored in HEC-DSS files. Output data is <br />predominantly stored in separate binary files. Although, most of the output <br />can also be sent to the HEC-DSS or flat ASCII files. <br /> <br />Data management is accomplished through the user interface. The modeler <br />is requested to enter a single filename for the project being developed. Once <br />the project filename is entered, all other files are automatically created and <br />named by the interface as needed. The interface provides for renaming, <br />moving, and deletion of files on a project by project basis. <br /> <br />Graphics and Reporting <br /> <br />Graphics include X-Y plots of the river system schematic, cross-sections, <br />profiles, rating curves, hydrographs, and many other hydraulic variables. A <br />pseudo three-dimensional plot of multiple cross-sections is also provided. <br />Tabular output is available. Users can select from pre-defined tables or <br />develop their own customized tables. All graphical and tabular output can be <br />displayed on the screen, sent directly to a printer (or plotter), or passed <br />through the Windows clipboard to other software, such as a word-processor <br />or spreadsheet. <br /> <br />Reporting facilities allow for printed output of input data as well as output <br />data. Reports can be customized as to the amount and type of information <br />desired. <br />