Well Volume Calculator

A well is measured from the top down, so what it holds comes from the depth to the standing water rather than from a fill level. Enter the casing bore, the total depth and the static water level, and this returns the gallons in the water column, the gallons per foot of casing and the volume to purge before a sample. A second action turns that purge into pumping time at a flow rate you have measured. It is the water sitting in the hole right now, not what the well can yield.

Calculator Type
Diameter Measured In
Depths Measured In
Tank Volume In
The bore, not the outside of the pipe. A "six inch well" means six inches inside. Domestic drilled wells are usually 4, 5, 6 or 8 inches; a dug well can be several feet across.
From the top of the casing to the bottom of the hole. It is on the well log or the driller's report.
The static water level: how far down the water surface sits with the pump off and rested. Measured from the same point as the depth.
Only needed if you are disinfecting. A typical household pressure tank holds 10 to 30 gallons, or 40 to 110 litres, and the pipework a few more. Leave blank for the well on its own.
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Diameter Measured In
Depths Measured In
Flow Measured In
The bore, not the outside of the pipe. A "six inch well" means six inches inside. Domestic drilled wells are usually 4, 5, 6 or 8 inches; a dug well can be several feet across.
From the top of the casing to the bottom of the hole. It is on the well log or the driller's report.
The static water level: how far down the water surface sits with the pump off and rested. Measured from the same point as the depth.
Three is the common rule and five is the cautious one. Some sampling protocols ask for a stable reading rather than a fixed number of volumes.
Measure it: time how long the pump takes to fill a bucket of known size.
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