Problem Solved: Pump Discharge Rate - Wastewater Math

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This question comes from the California Wastewater grade 3 certification exam sample questions that can be found here: http://www.swrcb.ca.gov/water_issues/programs/operator_certification/docs/3ques.pdf

The problem reads:
A pump was noted to lower the level in a basin by 10 feet in 12 minutes and 20 seconds while a steady flow rate of 180 g.p.m. was entering the basin. The basin diameter was 12 feet. What was the discharge rate of the pump expressed in gallons per minute

Видео Problem Solved: Pump Discharge Rate - Wastewater Math канала American Water College