[Utilities – Water Supply and Drainage Section] 20181121
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The maximum daily water consumption in a certain city is 120,000 m3/day. The water intake pump house operates continuously throughout the day, while the water delivery pump house supplies water in two different rates: 2.72% from 8 p.m. to 6 a.m. the following day, and 5.20% from 6 a.m. to 8 p.m. of the following day. What should be the regulating volume of the clear water tank in the water treatment plant? Solution: The regulating capacity of the clear water tank is: 120000 x (4.17% – 2.72%) x 10 = 17400 m3
120000x(4.17%–2.72%)x10=17400m3
Regulating volume of clear water tank = (4.167% – 2.72%) × 10/24 × 120000 = 724 m3
723---724m3