The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

• A. 0.20 cumec
• B. 0.12 cumec
• C. 0.10 cumec
• D. 0.15 cumec

Answer: (D)