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Thread: Determining the amount of water in well

  1. #1
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    Determining the amount of water in well

    This may be a dumb question, so I will apologize early.

    When determining the amount of available water in a well, what diameter do you use for the well? Example:

    I have a 260 foot deep well, pump set at 255 feet. According to the well guy's write up, static water level is at 168 feet. It is a 6" drilled well, with 250 feet of 4 inch casing.

    Now, I understand that I have 87 feet of standing water in the well, but do I base the rest of my calculations off of the 4" casing diameter, or the 6" drilled well size?

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    I am not sure why he would call a well with 4" casing a 6" well. But if the casing is 4" which has .66 gallons per foot, I would use that measurement not the 6" which has 1.5 gallons per foot.

    When doing your calculations, you need to add in the amount of water that the well is capable of making. He should have given you this figure as well. It may only be .5 gpm or as much as several hundred. Either way, he should have done some kind of test to determine this amount.

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    The paperwork shows that the well, when drilled, produced 7 GPM. I can tell you from experience that it no longer produces that same amount.

  4. #4
    Pump guy speedbump's Avatar
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    If there is only ten feet of exposed rock, maybe it can be drilled deeper to acquire more water. That would be my hope.

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  5. #5
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    quote:Originally posted by stihl025

    This may be a dumb question, so I will apologize early.

    When determining the amount of available water in a well, what diameter do you use for the well? Example:

    I have a 260 foot deep well, pump set at 255 feet. According to the well guy's write up, static water level is at 168 feet. It is a 6" drilled well, with 250 feet of 4 inch casing.

    Now, I understand that I have 87 feet of standing water in the well, but do I base the rest of my calculations off of the 4" casing diameter, or the 6" drilled well size?
    There has been allot of construction and expansion in your area in the past few years.(I live at Deep Creek Lake)Has your static water level dropped any over the past few years? Use your calculations from the 4" casing. This will give you the amount of water in the well. However, the amount of available water will vary with the depth to the water when the well is being pumped. According to the transmissive ability of the strata that you are drawing water from. If your water strata is being over used because of the expansion in the Pittsburgh area that could cause a decline in the water table.-------Go Steelers!------Denny























  6. #6
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    quote:Originally posted by stihl025

    The paperwork shows that the well, when drilled, produced 7 GPM. I can tell you from experience that it no longer produces that same amount.
    Does the paperwork say anything about a screen or, does it say bedrock intake???

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