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Can anyone please explain to me the difference between surface loading rate and surface overflow rate when used during the design calculations of sedimentation tanks in water treatment plants?

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I'm not 100% familiar with english terms of art. However, according to this document, they are the same:

The surface loading rate is a hydraulic loading factor expressed in terms of flow per surface area. This factor is also referred to as the “surface settling rate” or “surface overflow rate.” [...] Typical values of surface loading rates for primary clarifiers are 600 to 1,000 gallons per day per square foot.

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