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<br />Chapter 4 Example Application <br /> <br /> <br />Figure 4.8 Steady Flow Data Editor, with example probtem data <br /> <br />In this example, flow data will be entered at the upstream end of each reach. <br />An additional flow change location will be entered at river mile 9.6 of the <br />Yolo River. To add an additional flow change location into the table, first <br />select the Yolo River from the Reach list box. Next select the desired river <br />station location (9.6 in this example) from the River Sta.list box. Finally, <br />press the Add A Flow Change Location button. The new flow location <br />should appear in the table. Now enter all of the flow data into the table as <br />shown in Figure 4.8. <br /> <br />The next step is to enter any boundary conditions that may be required. To <br />enter boundary condition data, press the Enter Boundary Conditions button <br />at the bottom of the Steady Flow Data editor. The boundary conditions editor <br />should appear as shown in Figure 4.9. <br /> <br />Boundary conditions are necessary to establish the starting water surface at the <br />ends of the river system. A starting water surface is necessary in order for the <br />program to begin the calculations. In a subcritical flow regime, boundary <br />conditions are only required at the downstream ends of the river system. If a <br />supercritical flow regime is going to be calculated, boundary conditions are <br />only necessary at the upstream ends of the river system. If a mixed flow <br />regime calculation is going to be made, then boundary conditions must be <br />entered at all ends of the river system. <br /> <br />4-11 <br />