Problem 1 A 4-ft-diameter finished-concrete sewer pipe is half full of water. (a) Estimate the speed of propagation of a small-amplitude wave propagating along the channel. (b) If the water is flowing at 14,000 gal/min, calculate the Froude number. (c) Calculate the critical slope and (d) the actual slope if the uniform flow rate is 14,000 gal/min.