CIV E 530 - OPEN-CHANNEL HYDRAULICS SPRING 2006 HOMEWORK No. 6 (25 percent) Given the following design specifications: Q = 400 cfs; b = 20 ft; z = 1; and n = 0.019. What channel slope is necessary (use two significant digits) to set the normal depth not to exceed 4 ft? (25 percent) Given the following design specifications corresponding to the Taunsa-Panjad Link Canal, in Pakistan: Q = 19,000 cfs; b = 320 ft; z = 2.0; and So = 0.00032. What is the value of Manning's n (use two significant digits) that will keep the normal depth below 12 ft? (25 percent) Given the following data for three trapezoidal channels: Type Q (m3/s) z So n Vmax (m/s) I 50 2.0 0.005 0.04 2.0 II 200 2.5 0.0065 0.03 2.3 III 800 3.0 0.0005 0.035 1.6 in which Vmax = maximum permissible velocity. What is the design bottom width (with accuracy to within one-tenth of a meter) required to satisfy the specified maximum permissible velocity? (25 percent) Given: Q = 750 cfs; So = 0.0028; and n = 0.024. Using the permissible tractive force method, design a trapezoidal channel section for the following conditions: (a) z = 3.0; on sides and bottom: noncohesive material, slightly angular, d25 = 1 in. (b) z = 2.5; on sides: noncohesive material, slightly angular, d25 = 1 in; on bottom: noncohesive material with d50 = 1 mm, canal with high content of fine sediment in the water.