【Daily Question】Utilities - Water Supply and Drainage - 20200308

2020-03-08View Original

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It is known that the intensity of rainfall in the capital city of a certain province is: q5 = 354 L/(s·ha) when P = 5a, and q5 = 400 L/(s·ha) when P = 10a. The horizontal projection area of the roof of the provincial government office in this city is 2000 m2; therefore, the designed rainwater flow rate for this office is ( ) L/s. A. 63.7 B. 70.8 C. 72.0 D. 80.0 Answer: C. In this case, the building is considered an important public building; according to Table 4.9.5 of the current Code for Design of Building Water Supply and Drainage, the return period is taken as 10 years. With a runoff coefficient of 0.9, the designed rainwater flow rate is qy = 400 × 2000 × 0.9 / 10000 = 72 L/s

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【Daily Question】Utilities - Water Supply and Drainage - 20200308

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