Consider the outflow channel (weir launder) of a sedimentary tank. The flow rate equal to 3,000 m3/d, the length of the weir launder is 60 m, and a roughness coefficient (n) equal to 0.014 (smooth concrete), and the width of the launder (b) is 0.7 m. Determine: The initial depth of the water in the channel (H, m) and that at the free fall. Critical water depth at the free fall. Slope of the energy line (or potentiometric line) at the free fall. the depth of the weir launder considering the initial depth of the water in the channel increased of a safety factor of 1.2.