A channel delivers water from Blue Lake into Green Lake (both lakes are very large). The channel is 2 km long, has trapezoidal cross-section, with width b = a m at the bottom and slopes of 1V:1H (i.e., m =1 in Figure 1); the longitudinal slope of the channel is 1.5%, and the Manning roughness coefficient of n = 0.016 m s. The level of water in Blue Lake upstream is 2.5 m above the channel bed and the water level in Green Lake is 5 m above the channel bed.
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