60. A landscaped garden with irregular profile and minor undulations, measuring 35,000
sqm, has a total surface area covered with 20% brick paving, 15 % cement concrete
paving, and rest with grass. The peak intensity of rainfall in that region is 70 mm/hr.
The coefficient of runoff for brick paving, cement concrete paving and grass is 0.8, 0.9
and 0.5 respectively. The estimated quantity of runoff in cubic meter/hr for the entire
garden area is …………………….