【Daily Question】Utilities - Water Supply and Drainage - 20200214
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Which of the following statements regarding the flow characteristics of water in the neutral pipe of a vented and drained system with only a roof vent is incorrect? ( ) A. The flow in the drainage riser is a two-phase flow of water and vapor. B. The water flow in the drainage riser is intermittent and non-uniform. C. The maximum negative pressure in the drainage riser usually occurs at the bottom of the riser. D. The magnitude of the maximum negative pressure in the drainage riser is related to the height of the drainage lateral pipes, the volume of wastewater discharged, and the amount of ventilation. Answer: C
D. The magnitude of the maximum negative pressure in the drainage riser is related to the height of the drainage lateral pipes, the volume of wastewater discharged, and the volume of air supplied for ventilation