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<br />I <br />[Ce <br /> <br />I <br /> <br />I <br />I <br />I <br />[ <br />I <br />~fe <br />~ <br /> <br />I" <br />~ <br /> <br />vicinity of the project has been inspected and photographed and "n" values <br /> <br />representing each reach chosen. Photographs which illustrate friction values <br /> <br />are presented in Figures 6a. and 6b. <br /> <br />Friction values in the channel are affected by the size of the bed <br />material and brush on the channel banks. Bed material appears to be gravel <br />and small cobbles with occasional boulders. Channel conditions are illus- <br />trated in Figure 6b. Based on these photos and information in Chow (Ref. 1) <br />and Simons and Senturk, (Ref. 5) "n" values of 0.032 and 0.040 were used for <br />the channel. <br /> <br />Overbank friction values are primarily affected by the storage of <br /> <br /> <br />equipment, parts and scrap in storage areas and cattails, equipment and build- <br /> <br />ings in the existing pond area, as shown in Figure 7b. The base is composed <br /> <br />of generally smooth well compacted road base type material in the storage <br /> <br /> <br />areas. Assuming that most of this stored material is too heavy to be moved <br /> <br />by the low overbank velocities, overbank "n" values used were 0.070 in the <br /> <br /> <br />storage areas to 0.045 in the pond area. <br /> <br />Cross sect ions used to represent the topography were taken from the <br />December, 1981 topographic mapping supplied by Cotter Corporation. The topo- <br />graphy was mapped at a contour interval of 2 feet and a scale of 1 inch = 20 <br />feet. Supplemental surveyed cross sections were taken upstream and down- <br />stream of the topographic mapping to model hydraulic conditions entering. and <br />Teaving the Water Treatment Plant and Emergency Storage Pond site. <br /> <br />. <br /> <br />5-2 <br />