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<br />4. From Chart 32, determine ~, the ratio of critical <br />shear on the side to critical shear on the channel <br />bottom, based on side slope and the stone angle <br />of repose. <br /> <br />e <br /> <br />5. The required D50 for the side slopes is Kl!K2 <br />times D50 for the bottom. <br /> <br />Kl <br />~ (D50)bottom <br /> <br /><; <br /> <br />(D50) sides .. <br /> <br />~ <br /> <br />Bend Protection <br /> <br />There al:'e two design si tuation$: long bends, 6 ::t_ 6c, and stlort <br />bends, 6 < 6c' where 6 is the intemal angle of the channel bend <br />and 6c is the internal angle which differentiates between a short <br />and a long bend. Determine which condition exists by computing <br />6c and comparing this value with 6. <br /> <br />Ro <br />Rd <br /> <br />6 == arc cos <br />c <br /> <br />If 6 ~ 6 , use the long bend procedure. <br />c <br />If 6 < 6c' use the short bend procedure. <br /> <br />e <br /> <br />Long Bend Procedure <br /> <br />L Determine the design depth of flow, d, in the straight <br />channel reach. <br /> <br />2 <br />2. From Chart 33, obtain K3 based on the ratio V !Rd' <br /> <br />3. <br /> <br />The adjusted depth of flow, dadj, for which the lining <br />must be designed is ~ times the design depth for the <br />straight reach. <br /> <br />.. <br /> <br />dadj .. K3 (d) straight <br /> <br />II <br /> <br />4. <br /> <br />Determine lining and! or rock size for d d" slope, and <br />soil erodibility from the Maximum Permi~slble Depth <br />Charts. <br /> <br />e <br /> <br />16 <br />