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<br />Chapter 3 WorkinA' With HEC-RAS - An Overview <br /> <br /> <br />Figure 3.7 Steady Flow Analysis window <br /> <br />As shown in Figure 3.7, the modeler puts together a Plan by selecting a <br />specific set of geometric data and flow data. A Plan can be put together by <br />selecting New Plan from the File menu bar option of the Steady Flow <br />Analysis window. Once a plan has been put together, the modeler must select <br />a Flow Regime for which the model will perfonn calculations. Subcritical, <br />Supercritical, or Mixed flow regime calculations are available. <br /> <br />An option for selecting a Computation Range is also available. This option <br />allows the modeler to select a specific piece of the river system to work on. <br />By selecting this option, the system will only perfonn calculations on the <br />smaller subset of the full data. This option is useful when it is desired to <br />calibrate the model or adjust data for a small piece of the river system. This <br />option should be left blank when it is desired to perfonn calculations for the <br />full river system. Also, once the modeler is finished working on the smaller <br />subset of the river system, the model should always be re-run for the entire <br />system. If the model is not re-run for the entire system, output will only be <br />available for the smaller subset. <br /> <br />Additional features are available under the Options menu for: setting output <br />options; conveyance calculation options; friction slope methods; calculation <br />tolerances; critical depth computation method; data checking; setting log file <br />levels; and viewing the log file output. <br /> <br />Once the modeler has selected a Plan and set all of the calculation options, the <br />steady flow calculations can be perfonned by pressing the Compute button at <br /> <br />3-9 <br />