If the velocity of flow through a wide rectangular channel is 2m s and the rate of change of depth is 3 10-5m, calculate the manning s constant of the channel if the uniform flow depth is 1m and yn=0.6m. Given: Critical depth = 0.5m.

• A. 0.38 10^-3
• B. 1.38 10^-3
• C. 2.38 10^-3
• D. 3.38 10^-3