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    ashle47860's Avatar
    ashle47860 Posts: 1, Reputation: 1
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    #1

    Jul 11, 2005, 01:59 PM
    Someone please help !
    If you have water flowing through an 8 inch diameter storm sewer at a rate of 12 cubic feet per min. Howe would you calculate the linear velocity in feet per second of the flow?
    drnikitin's Avatar
    drnikitin Posts: 4, Reputation: 1
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    #2

    Jul 13, 2005, 02:52 AM
    I'll give you solution. Please resend this problem to my address [email protected]
    fizixx's Avatar
    fizixx Posts: 13, Reputation: 2
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    #3

    Jul 29, 2005, 05:44 PM
    cylinder of water
    Ok... if the pipe is totally filled with water as it exits then you can say that you have a 'disk' of water with area (a) = (pi)r^2

    r = radius of the pipe = (8/2)" = 4" = 1/3 ft (need to keep everything in the same units)

    a = 0.35 ft^2

    a volume of 12 (ft^3)/min means you have a cylinder of water that has an area as described above but has a length of:

    Volume(v) = area x length
    ==> v = aL
    ==> L = v/a = [12 ft^3]/[0.35 ft^2] = 34.28 ft

    So...

    ... in one minute you have a length of water of 34.28 ft that is traversed.

    That's a rate of 34.28 ft/min... or in more familiar units:

    34.28 ft/min = 0.57 ft/s [This is about 0.39 mph for your reference]

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