<PRE><B>Question 1106828</B>
detention time = total volume / feed rate
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2.1 MGD = 11697.0122 cu.ft./hr
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detention time = (80 * 30 * 10) / 11697.0122 = 2.0518 hours
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another way to do this is
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(((80 * 30 * 10) * 7.48) / (2100000)) * 24 = 2.0517 hours
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Note 1 cu ft = 7.48 gallons
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Note MGD is millions of gallons per day
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