A rectangular channel is 91.5 m (300 ft) wide and the normal depth is 2 74 m r0 with an av...

A rectangular channel is 91.5 m (300 ft) wide and the normal depth is 2 74 m r0 with an average velocity of 1.83 mps (6.0 fps). A roadway is to cross the channel using a bridge with equal encroachments from each side. Determine the water depth at Sections 2 and 3 tor bridge lengths (B) of 30.5, 45.7, and 61.0 m (100 150 and 200 ft). What is the maximum length of bridge that will cause critical depth to occur intheconstriction? Neglect headloss and channel slope.