What unit is used for surface overflow rate?

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Multiple Choice

What unit is used for surface overflow rate?

Explanation:
Surface overflow rate is the flow that can pass per unit surface area of a clarifier. It’s defined as Q/A, with Q as the flow rate and A as the clarifier’s surface area. In US customary units, Q is measured in gallons per day and A in square feet, giving the unit gallons per day per square foot. That makes the standard unit gpd/ft². Other options mix different time bases (per hour or per minute) or use cubic feet, which don’t represent flow spread over the surface area of the clarifier.

Surface overflow rate is the flow that can pass per unit surface area of a clarifier. It’s defined as Q/A, with Q as the flow rate and A as the clarifier’s surface area. In US customary units, Q is measured in gallons per day and A in square feet, giving the unit gallons per day per square foot. That makes the standard unit gpd/ft². Other options mix different time bases (per hour or per minute) or use cubic feet, which don’t represent flow spread over the surface area of the clarifier.

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