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<br />4.12 <br /> <br />4.2.2.2 Without-Berm Flood ScenariQ <br />Modeling results for the mud flow, obstructed channel, without-berm flood <br />scenario are presented on Figures 4.9 and 4.]0. This scenario assumed that flows <br />along Cornet Creek were blocked in gri del ements numbE!rs 13 and 19. The <br />direction of flood flows to the eastern side of the apex was therefore solely <br />dependent on the surrounding topography, assumed hydraul ic roughness, and <br />obstructions to flow. As shown in the figures, the area of inundation, depths <br />and velocities on the eastern half of the apex are much greater than predicted <br />for the with-berm condition. The flow on the western and eastern halves of the <br />apex is seen to be more evenly distributed if the berm is not simulated and the <br />channl~ Ii s obstructed. <br />Figure 4.9 delineates the maximum flow depths predicted over the alluvial <br />fan apex, Along the existing Cornet Creek channel depths of flow range between <br />2 to 4 feet.. Similarly, on the eastern side of the apex, dE!pths a"long thl~ <br />historic channel are also in the range of 2 to 4 feet. <br />Figure 4.]0 defines the maximum velocitiE!s predicted over' the apf'x. <br />Velocities along the existing Cornet Creek channel range from 20 to 30 fps, <br />Along the historic channel on the eastern sidE! of the apex, velocities were <br />predicted to range from ]0 to ]5 fps. <br />