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<br />Chapter 4 Example Application <br /> <br /> <br />Figure 4.9 Steady Flow Boundary Conditions <br /> <br />The boundary conditions editor contains a table listing every reach. Each <br />reach has an upstream and a downstream boundary condition. Connections to <br />junctions are considered internal boundary conditions. Internal boundary <br />conditions are automatically listed in the table, based on how the river system <br />is connected in the geometric data editor. The user is ouly required to enter <br />the necessary external boundary conditions. <br /> <br />In this example, it is assumed that the flow is subcritical throughout the river <br />system. Therefore, it is only necessary to enter a boundary condition at the <br />downstream end of the Yolo River. Boundary conditions are entered by first <br />selecting the cell in which you wish to enter a boundary condition. Then the <br />type of boundary condition is selected from the four available types listed <br />above the table. The four types of boundary conditions consist of: <br /> <br />. Known water surface elevations <br /> <br />. Critical depth <br /> <br />. Normal depth <br /> <br />. Rating curve <br /> <br />For this example use the normal depth boundary condition. Once you have <br />selected the cell for the downstream end of Yolo River, press the Normal <br />Depth button. A popup box will appear requesting you to enter an average <br /> <br />4-12 <br />