【Daily Question】Utilities - Water Supply and Drainage - 20200204
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Which of the following statements regarding the hydraulic calculation of internal building drainage pipes is correct? ( ) A. Internal building drainage horizontal pipes are calculated using the formulas for unsteady flow in open channels. B. Internal building drainage vertical pipes are calculated assuming that the flow within them is plug flow. C. In the hydraulic calculation formulas for internal building drainage horizontal pipes, R represents the radius of the pipe. D. Internal building drainage vertical pipes are designed based on their maximum water-carrying capacity under different ventilation conditions. Answer: D
B. The internal drainage risers in buildings are calculated based on a plug flow condition of the water flow