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necessary to have the assumed velocities agree with the calculated velocities? Design a vortex type grit removal facility to handle a peak flowrate of 40,000m3/d. No grit sampling program has been conducted, and the design is to be based on removal of grit particles with an assumed SES of 106m. If this facility is located in an area that is known to have fine grit, what would be the expected percent grit removed? To achieve 90 percent grit removal, what adjustments would be necessary in the design of the facility