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The one-dimensional hydrodynamic model described earlier was used to calculate flow <br />depths and water surface elevations for each cross section for each of the eight discharges listed <br />in Table 4. The model has one free parameter, Manning's n, which was adjusted through trial- <br />and-error until there was reasonably good agreement between modeled and measured water <br />surface elevations. The differences between modeled and measured water surface elevations are <br />generally less than 10 cm, and in a few cases up to 20 cm (Fig. 24). <br />101.0 <br />RM 176 <br />100.0 <br />E - . <br />99.0 ° <br />e <br />p ..-6 <br />98.0 f' <br />W <br />.... o---- 37 m3/s <br />97.0 ---- <br />•-• 125 mils <br />--•-o---• 176 m3/s <br />Ao--- <br />96.0 <br />0 100 200 300 400 500 600 700 800 <br />Distance (m) <br />101.0 <br />RM 176 <br />100.0- <br />99.0- 0 <br />m 98.0 <br />W ---•o---- 278 m3/s <br />o-••- 346 m3/s <br />97.0 ----o---- 363 m3/s <br />•---- 394 m3/s <br />96.0 <br />0 100 200 300 400 500 600 700 800 <br />Distance (m) <br />Figure 24. Comparisons between modeled and measured water surface elevations, RM 176. <br />Upper panel shows data from lower flows, lower panel shows data from higher flows. <br />49