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<br />Chapter 3 Working With HEC-RAS - An Overview <br /> <br />downstream (in the positive flow direction). After the reach is drawn, the user <br />is prompted to enter an identifier. The identifier can be up to twelve <br />characters in length. As reaches are connected together, junctions are <br />automatically formed by the interface. The modeler is also prompted to enter <br />an identifier for each junction. <br /> <br /> <br />.Edit ~ew Iables Qptions Help <br /> <br /> <br />Yolo River <br /> <br />Figure 3.4 Geometric Data Window <br /> <br />After the river system schematic is drawn, the modeler can start entering <br />cross-section and hydraulic structure data. Pressing the Cross Section button <br />causes the cross section editor to pop up. This editor is shown in Figure 3.5. <br />As shown, each cross section has a Reach name, River Station, and a <br />Description. The Reach and River Station identifiers are used to describe <br />where the cross section is located in the river system. The "River Station" <br />identifier does not have to be the actual river station (miles or kilometers) at <br />which the cross section is located on the stream, but it does have to be a <br />numeric value (e.g. 1.1, 2, 3.5, etc.). The numeric value is used to place cross <br />sections in the appropriate order within a reach. Cross sections are ordered <br />within a reach from the highest river station upstream to the lowest river <br />station downstream. <br /> <br />3-5 <br />