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<br />Chapter 4 Example Application <br /> <br />Entering Geometric Data <br /> <br />The next step in developing a steady flow model with HEC-RAS is to enter <br />the geometric data. This is accomplished by selecting Geometric Data from <br />the Edit menu on the HEC-RAS main window. Once this option is selected <br />the geometric data window will appear (Figure 4.3). <br /> <br />Drawing the Schematic of the River System <br /> <br />In this example we are going to develop a three-reach system as shown in <br />Figure 4.3. Draw in the river system schematic by performing the following <br />steps: <br /> <br />I. Click the River Reach button on the geometric data window. <br /> <br />2. Move the mouse pointer over to the drawing area and place the pointer <br />at the location in which you would like to start drawing the first reach. <br /> <br />3. Hold down the left mouse button and draw the reach from upstream to <br />downstream (in the positive flow direction). <br /> <br />4. The interface will prompt you to enter an identifier for the reach. This <br />identifier is limited to 12 characters. <br /> <br />5. Repeat steps 1 through 4 for each reach. After you enter the identifier <br />for reach three you will also be prompted to enter an identifier for the <br />junction (location where two or more streams join or split apart). <br /> <br />Once you have finished drawing in the river system, there are several options <br />available for editing the schematic. These options include: deleting reaches, <br />changing labels, and moving any objects (objects are labels, junctions, and the <br />ends of reaches). The editing features are located under the Edit menu on the <br />Geometric Data window. Note: when you fll'st draw your schematic there <br />will not be any tic marks representing cross sections as shown in Figure <br />4.3. <br /> <br />4-3 <br />