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<br />4.7 <br /> <br />4.2.1.2 Without-Berm Flood Scenario <br />This flood scenario assumes that the existing Cornet Creek channel is <br />obstructed within grid elements numbers 13 and 19. Essentially, all flow along <br />Cornet Creek is forced towards the eastern half of the fan. Flood flows were <br />free to follow a course dictated by the topography, roughness, and flow <br />obstructions on the fan. Results for the w"tr!r flood, obstructed channel, <br />without berm flood scenario over the Cornet Creek fan apex are presented in <br />Figures 4.5 and 4.6. Review of the figures shows the flood to distinctly split <br />between the existing Cornet Creek channel on the west side of the apex and the <br />historic channel path on the eastern half of the apex. <br />The maximum depth contours for the flood scenario are presented in Figure <br />4.5 and the maximum velocity values predicted are shown in Figure 4.6. Flow <br />depths along the existing channel range from approximately 2 to 4 feet. Depths <br />on the east side of the fan range between 1 and 2 feet. Ve 1 ocit i es of flow <br />average between IS to 20 fps along the Cornet Creek. Velocities along the <br />historic channel range between 10 to 15 fps. Overbank flow velocities are <br />generally less than 5 fps. <br /> <br />4. 2 _ 2 Mud Flow <br />4.2.2.1 With-Berm Flood Scenario <br />Hydraul i c model i ng results for the mud fl ow, with-berm, unobstructed <br />channel flood condition are presented on Figures 4.7 and 4.8. The results for <br />this simulation are similar to those for the water flood, with-berm condition, <br />The berm directs the majority of flow along the existing channel of Cornet Creek <br />on the western side of the fan. Significant overflow to the eastern half of the <br />fan is also pred i cted. The i nfl uence of the hi stori c channel on the fl 0'0' <br />direction is apparent on the eastern half of the fan. <br />Maximum flow depths are presented on Figure 4.7. Depths are seen to range <br />from 3 to 5 feet along the existing channel. Shallower depths of 1 to 2 feet <br />are predicted to occur on the eastern side of the fan. In local ized grid <br />elements on the west side of the fan depths up to J feet are predicted. Maximum <br />velocities predicted for the simulation are presented in Figure 4.8. Predicted <br />velocities along Cornet Creek typically range between 20 to 30 fps. Overbank <br />flow velocities were predicted to range between 1 to 10 fps. <br />