It is not possible to answer the question as given since there is no information as to whether the 140 feet refers to radius, diameter, circumference (or some other measure).
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280 gallons of water.
Diameter = 140/pi cm
The diameter is 13.35
Volume = pi*(10/12)2*140 = 87.266 cubic feet to 3 decimal places
140 feet=42.67200 meters