- 2 A Town Has An Area Of 6 Km Of Which 3 Km Is Residential Area Runoff Coefficient Is 0 7 2 Km Is Commercial Area 1 (53.15 KiB) Viewed 17 times
2. A town has an area of 6 km², of which 3 km² is residential area (runoff coefficient is 0.7), 2 km² is commercial area
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2. A town has an area of 6 km², of which 3 km² is residential area (runoff coefficient is 0.7), 2 km² is commercial area
2. A town has an area of 6 km², of which 3 km² is residential area (runoff coefficient is 0.7), 2 km² is commercial area (runoff coefficient is 0.8), and 1 km² is green area (runoff coefficient is 0.5). Assuming that the time for rainwater to flow from the farthest region to the sewer is 10 minutes, the length of the sewer is 3,000 meters, the design flow rate of the sewer is 2 m/s. The estimation of rainfall intensity for the area is as follows, where the unit of I is mm/hour, t is the time of concentration (minutes). Please calculate the peak flow rate of the sewer. 1851 I= (t + 1907