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Finding volume

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How to find the volume of a cyclinder when your just given the diameter of 70 feet

Guest Feb 26, 2017
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#1
+79894
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You can't.....you must also know the height....

CPhill  Feb 26, 2017
#2
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So how could i find the height whem all i have is the diameter? I know my diameter is 70 which would make my radius 35 but not sure how to figure height out

Guest Feb 26, 2017
#3
+79894
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The diameter isn't related to the height.....the height might be any positve value....

Thus......the volume depends on both the diameter  and height ....

CPhill  Feb 26, 2017
#4
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My questiom is a 70 foot diameter clarifier drops 5 inches in 15 minutes during a calibration test on a was pump. Calculate the was pumping rate in gallons per minute. It says to convert the inches into feet and divide by the time it took for it to drop

Guest Feb 26, 2017
#5
+79894
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OK....we have something we can work with

5 inches = 5/12 ft

The volume of water  drained   is  given by:

pi * (diameter/2)^2 * (height)   =

pi * ( 70/2)^2 (5/12)   =  6125 * pi  / 12     cubic ft of (water??)

If we're talking abbout water...we need to know how many gallons of water are in a cubic ft

1 ft^3  water  ≈ 7.48051948 gal of water

So...the total gallons drained  ≈   (7.48051948) 6125 * pi  / 12 ≈ 11995 gal

Divide this by 15   and we get  that about 800 gals are drained per minute

CPhill  Feb 27, 2017

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