A trapezoidal channel of 2.5 m bed width and 1 : 1 side slope has a bed slope of XXXXXXXXXXUnder the normal conditions the depth of flow is equal to the critical depth, which is 0.9 m. A gate is...

A trapezoidal channel of 2.5 m bed width and 1 : 1 side slope has a bed slope of 0 .0045. Under the normal conditions the depth of flow is equal to the critical depth, which is 0.9 m. A gate is located in the midway of the channel length as shown in Figure P15.26. The depth of water just upstream of the gate is 1.4 m. Determine the length of the backwater curve using the step by step method. Take the Chezy roughness coefficient, C, as 45 (metric).