Question 9006 of 234 · California Wastewater Operator Exam
A circular clarifier, 60 ft in diameter, has a weir around its circumference. Flow is 1.5 MGD. What is the weir overflow rate?
Exactly one answer is correct.
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Correct answer to question 9006
- A: 7,962 gpd/ft
Explanation
Weir length = 3.14 x 60 = 188.4 ft. Weir overflow rate = 1,500,000 / 188.4 = 7,962 gpd/ft. Using the diameter as the weir length, or using the tank area, are common mistakes.
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