Laserfiche WebLink
<br />6. The downstream channel should be the same as the upstream <br />channel, including a trickle channel. For concrete trickle channels a <br />foundation wall similar to the one used for the upstream trickle channel <br />should be used. In some instances the wall may also be used to control <br /> <br />seepage and piping. <br /> <br />EXAr~PLE PROBLEM <br /> <br />GIVEN: <br /> <br />1600 cfs <br /> <br />Upstream and downstream channel dimensions <br /> <br />bottom width = 50 ft. <br /> <br />side slopes = 4:1 <br />Yn = 4.0 ft. <br /> <br />S = .0043 ft./ft. <br />Yc = 2.9 ft. <br />Vn = 6.0 fps <br /> <br />Erosion resistant soils <br /> <br />Concrete trickle channel <br /> <br />Drop required = 3.0 ft. <br /> <br />PROCEDURE: <br /> <br />1. Use Table 3 <br /> <br />For C = 3.0', Vn = 6.0 fps and Yn and Y2 = 4.0' <br /> <br /> <br />Select the riprap designation and the riprap basin <br /> <br />..-.:. -.. <br />.Tl <br /> <br />dimensions. <br /> <br />Riprap - Type H <br /> <br />B = 1.0' <br /> <br />A = 2.5' <br /> <br />LB = 20' <br />D = 5.0' <br />E = 4.0' <br /> <br />12- <br />