(b) A long irrigation channel with rectangular cross section is designed to convey water at a rate of 5 m/s. The channel bed slope is 1:500 and the bottom material

is gravel with a representative size of 10 mm. Particle and water densities are 2650 kg/m and 1000 kg/m, respectively. The kinematic viscosity of water is 10m2/s. What are the ranges of values of channel width B for which the bed particles are stable? Answering this question, you will need to: 1. Identify the overall procedure for solving this question. 2. Compute the hydraulic radius corresponding to the critical condition for thebed particles. 3. Select a procedure for calculating Manning's coefficient and obtain its value. 4. Find the ranges of values of channel width B for which the bed particles are stable.