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The flow rate in cubic feet/second is (3*1.5*3) = 14.5 cubic ft/sec.

According to Google, there are 6.229 Imperial gallons or 7.481 US gallons in 1 cubic foot.

Therefore, the flow rate is 90.32 Imp gallons/sec or 108.47 US gallons/sec.

If this many gallons flow per second, then (90.32 x 60) = 5419 Imp gallons flow per 1 minute, or equivalently 6508 US gallons per minute.

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Q: Water flowing in rectangular channel that is 3.0 feet water with a depth of 18 inches and a velocity of 3.0 feet per second what is the flow in gallons per minute?
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