SC Water And Sewer Plants Practice Questions - South Carolina Water And Sewer Plants Contractor Examination Exam

Why must clarifier effluent weirs and launders be set to the elevations and levelness shown on the plant drawings?

Weir elevation has no hydraulic effect if the tank volume is correct An out-of-level weir causes uneven overflow, short-circuiting, and incorrect side-water depth Launders are decorative and may be set to the nearest form mark Weirs are adjusted only after the plant has been in service for one year

Correct Answer:

An out-of-level weir causes uneven overflow, short-circuiting, and incorrect side-water depth

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