Water flows uniformly at a depth of 1 m in a channel that is 5 m wide, as shown in Fig....

Water flows uniformly at a depth of 1 m in a channel that is 5 m wide, as shown in Fig. P10.51. Further downstream the channel cross section changes to that of a square of width and height b. Determine the value of b if the two portions of this channel are made of the same material and are constructed with the same bottom slope.