For a symmetrical trapezoidal open drain in a landscape with grass and loose rock, surface, the velocity of flow of water is ___ m/sec, (round off to two decimal places), given the following data. Water edge width at the top = 750 mm Water edge width at the bottom = 45000 mm Water depth = 600 mm Manning s coefficient of roughness = 0.05 Slope along the drain = 1 in 250

• A. 4.5
• B. 0.45
• C. 45
• D. 1.5