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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />OOl()j9 <br /> <br />3. Bankfull Width <br /> <br />The bankfull width of Cherry Creek in the study reach is approximately 450 <br />feet. However, thi s d imens ion vari es great 1y from 150 feet in Bend No. 5 (see <br />Figure-3) to 1000 feet in the region of Bend No.4. The bankfull width is the <br />width of the water surface, normal to the direction of flow, immediately before <br />the river begins to spillover its banks. In the upstream portion of the study <br />reach, there are appreciable shrubs and trees in the bankfull width. (See <br />Figure 14 for definition of terms). <br /> <br />4. Act i ve Bed Wi dth <br /> <br />The active bed is that portion of the riverbed which transports bed load <br />during floods and is not covered with herbaceous (leafty) vegetation. In the <br />study reach, the active bed width is approximately 230 feet but varies from 150 <br />to 450 feet. <br /> <br />5. Bankfull Oepth <br /> <br />Most of the banks of Cherry Creek are terraces. Where the banks are <br />recent alluvium, the bank height is on the order of 3 to 5 feet high. In the <br />ent ire study reach, the average bank hei ght is approximately 7 feet, rangi ng <br />from 3 to 13 feet. The highest bank heights are along the terrraces. <br /> <br />6. Width-to-Oepth Ratio <br /> <br />For the active bed, the width-to-depth ratio is 33. Using bankfullwidth, <br />the ratio increases to 64. <br /> <br />7. Bends <br /> <br />As shown in Figure-3, there are 13 bends in the study reach. The cur- <br />vature and deflection angle of each have been estimated from the October 1983 <br />aerial photograph. The data are summarized below. <br /> <br />-17- <br />