A dewatering pump discharges 75 gallons per minute for 3 hours. How many gallons are discharged?
Correct Answer
A) 13,500 gallons
Three hours is 180 minutes. Discharge is 75 gal/min x 180 min = 13,500 gallons.
Why This Is the Correct Answer
Three hours is 180 minutes. Discharge is 75 gal/min x 180 min = 13,500 gallons.
Why the Other Options Are Wrong
Option B: 225 gallons
dewatering discharge volume, choice a: 225 gallons uses 3 pump minutes at 75 gal/min; the accepted time is 180 minutes. Discharge check.
Option C: 4,500 gallons
dewatering discharge volume, choice c: 4,500 gallons is wrong because 4,500 gallons uses 60 pump minutes at 75 gal/min; the accepted time is 180 minutes. Discharge check.
Option D: 15,000 gallons
dewatering discharge volume, choice d: 15,000 gallons uses 200 pump minutes at 75 gal/min; the accepted time is 180 minutes. Discharge check.
Memory Technique
Remember dewatering discharge volume as "base, adjustment, final unit"; the last unit should read 13,500 gallons.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - dewatering to confirm that Three hours is 180 minutes.
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