Water is flowing in a rectangular channel with a bed slope of0.0005 ft/ft. The channel width is 10 ft and the discharge is 300 cfs. Now, suppose that the depth at a given place in the channel is...

Water is flowing in a rectangular channel with a bed slope of0.0005 ft/ft. The channel width is 10 ft and the discharge is 300 cfs. Now, suppose that the depth at a given place in the channel is observed to be 6 ft, and the depth observed at a spot 1000 ft downstream is observed to be 4.5 ft. Estimate the Manning n coefficient of this channel.