What is the surface overflow rate value for the 60 ft diameter clarifier at 2,000 gpm?

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Multiple Choice

What is the surface overflow rate value for the 60 ft diameter clarifier at 2,000 gpm?

Explanation:
Surface overflow rate measures how much flow is spread across the clarifier’s surface per day. For a circular tank, the surface area is A = πD^2/4. Since gpd uses daily flow, convert the flow from gpm to gpd by multiplying by 1,440. With a 60 ft diameter and 2,000 gpm: A = π(60)^2/4 = 900π ≈ 2,827.43 ft^2 Q_gpd = 2,000 × 1,440 = 2,880,000 gpd SOR = Q_gpd / A ≈ 2,880,000 / 2,827.43 ≈ 1,018 gpd/ft^2 So the surface overflow rate is about 1,018 gpd/ft^2, which matches the given value.

Surface overflow rate measures how much flow is spread across the clarifier’s surface per day. For a circular tank, the surface area is A = πD^2/4. Since gpd uses daily flow, convert the flow from gpm to gpd by multiplying by 1,440. With a 60 ft diameter and 2,000 gpm:

A = π(60)^2/4 = 900π ≈ 2,827.43 ft^2

Q_gpd = 2,000 × 1,440 = 2,880,000 gpd

SOR = Q_gpd / A ≈ 2,880,000 / 2,827.43 ≈ 1,018 gpd/ft^2

So the surface overflow rate is about 1,018 gpd/ft^2, which matches the given value.

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