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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 />6 <br /> <br />It is not within the scope of this report to present design for the channelization; <br />therefore, velocities and capacities are presented in the following tabulation <br />for a channel having 2:1 banks and bottom widths of 8, 12, 16, and 20 feet. <br />Quantities are based on a channel length of 17 miles. <br /> <br /> 8' Bottom 12' Bottom 16' Bottom 20' Bottom <br />depth V Q V Q V Q V Q <br />(ft) (ft/sec) (cfs) (ft/sec) (cfa ) Ut/ sec) (cfs) (ft/sec) (cfs) <br />0 0 0 0 0 0 0 0 0 <br />0.5 0.56 3 0.58 4 0.60 5 0.60 6 <br />1.0 0.92 9 0.95 13 1.00 18 1.02 22 <br />1.5 1.25 21 1.28 29 1.32 38 1.33 46 <br />2.0 1.50 36 1.55 50 1.60 64 1.62 78 <br />2.5 1. 70 55 1. 75 74 1.85 97 1.87 117 <br />3.0 1.88 79 1.95 105 2.07 137 2.10 164 <br />3.5 2.05 108 2.15 143 2.26 182 2.30 217 <br />4.0 2.20 141 2.30 184 2.45 235 2.50 280 <br />4.5 2.35 180 2.45 232 2.60 293 2.67 348 <br />5.0 2.50 225 2.60 286 2.70 351 2.80 420 <br /> <br />The quantities of excavated material will vary as follows: <br /> <br />Channel with 8 foot bottom <br />Channel with 12 foot bottom <br />Channel with 16 foot bottom <br />Cbannel with 20 foot bottom <br /> <br />= 638,293 c.y. <br />a 744,676 c.y. <br />a 851,058 c.y. <br />a 957,440 c.y. <br /> <br />There is much difference in conditions affecting this project and the Norton <br />Drain. One of the problems thst arose in connection with the Norton Drain and <br />which may cause difficulty in the future is caused by the relstively narrow <br />right of way. In the case of the Norton Drain the right of way was purposely <br />kept to a minimum as the land owners donated the land and were reluctant to <br />convey more than absolutely necessary for construction. Also, it did not seem <br />advisable for the District to be left with land not needed for the project and <br />land for which it would become responsible for weed control and other maintenance <br />problems. <br /> <br />In the case of the Rock Creek channelization the channel will be both wider and <br />deeper and at this time there is no plan to remove the excavated material; <br />therefore, a right of way 133 feet wide is suggested. If arrangements can he <br />made for the disposition of the excavated material the right of way width can <br />be reduced materially. This width would permit half of the excavated material <br />to be deposited on each side of the channel and to serve aa protective dikes <br />to eliminate indiscriminate entry of waste water into the channel. <br /> <br />0579 <br />