Calculate the discharge through a most economical circular section in case of maximum velocity if the radius of the channel is 0.5m, bed slope of 1 in 500 and the value of n = 0.016.

• A. 0.43 m3/s
• B. 0.53 m3/s
• C. 0.63 m3/s
• D. 0.73 m3/s