At a flow of 2.0 MGD, what is the weir overflow rate of a 60 ft diameter primary clarifier?

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Multiple Choice

At a flow of 2.0 MGD, what is the weir overflow rate of a 60 ft diameter primary clarifier?

Explanation:
Weir overflow rate is the flow per foot of weir. For a circular clarifier, the weir runs around the entire perimeter, so the weir length is the circumference, which is π times the diameter. Convert the flow to gallons per day: 2.0 MGD = 2,000,000 gal/day. The circumference for a 60 ft diameter is π × 60 ≈ 188.50 ft. Divide the flow by this length: 2,000,000 / 188.50 ≈ 10,607 gpd/ft, which rounds to about 10,615 gpd/ft.

Weir overflow rate is the flow per foot of weir. For a circular clarifier, the weir runs around the entire perimeter, so the weir length is the circumference, which is π times the diameter. Convert the flow to gallons per day: 2.0 MGD = 2,000,000 gal/day. The circumference for a 60 ft diameter is π × 60 ≈ 188.50 ft. Divide the flow by this length: 2,000,000 / 188.50 ≈ 10,607 gpd/ft, which rounds to about 10,615 gpd/ft.

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