CIV E 530 - OPEN-CHANNEL HYDRAULICS SPRING 2007 HOMEWORK No. 6 (25 percent) Given the following design specifications: Q = 400 cfs; b = 20 ft; z = 1; and n = 0.021. What channel slope is necessary (use two significant digits) to set the normal depth not to exceed 5 ft? Use CHANNEL by trial and error. Use three significant digits. Report final output from CHANNEL. (25 percent) Given the following design specifications corresponding to the Taunsa-Panjad Link Canal, in Pakistan: Q = 18,000 cfs; b = 320 ft; z = 2.0; and So = 0.00032. What is the value of Manning's n that will keep the normal depth below 10 ft? Use CHANNEL by trial and error. Use two significant digits. Report final output from CHANNEL. (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? Use CHANNEL. (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.