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<br />enough. For example, seven or more subsections would be required to <br /> <br /> <br />identify a main channel, a dike field along both sides of the main <br /> <br /> <br />channel, a strip of rather dense growth immediately adjacent to the <br /> <br /> <br />channel on both banks and one or more strips of less dense growth or <br /> <br /> <br />cleared fields on both flood plains. <br /> <br />Section 5.03. Discharge and Starting Water Surface Elevation <br /> <br />In open channel flow problems, any term, either in the one-dimensional <br />energy equation or the other independent equations, can become the <br />independent variable. However, Q is usually the independent variable. <br />The associated starting water surface elevation, WS1, is often obtained <br />either from a rating curve for a "control" relationship or by some <br />other criteria such as a rule curve specifying reservoir elevation at <br />a dam. <br />If a rating curve is not available it is desirable to locate. <br />if possible. a critical depth control section. This is a location <br />where flol'/S are known to pass through critical depth for the full <br />range of discharges being analyzed--for example, a waterfall. weir or <br />section of rapids in the river. <br />If a critical depth control section is not available, then select <br />a starting point some distance away from the location where the rat- <br />ing curve is needed and calculate the water surface profiles for a <br />range of starting elevations. These profiles will converge toward a <br />corrlllon point which is the rating curve elevation for that discharge. <br />Repeating this procedure for the range of discharges to be analyzed <br /> <br />5.06 <br />