A triangular concrete-lined channel (n=0.017) has a constant mild bed slope of 0.0015, side slopes of 1H:1V, and a norma

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A triangular concrete-lined channel (n=0.017) has a constant
mild bed slope of 0.0015, side slopes of 1H:1V, and a normal flow
depth of 2.60m. A sluice gate was installed along the triangular
canal that immediately raised the flow depth to 5.0m. Perform the
Graphical Method at an interval of 0.01m. Start iterating at y =
2.70m such that x = 0.
1. Determine x at y = 4.00m.
2. Determine x at y = 5.00m