![]() Using a mathematical formula (lbs pressure X 2.31 = Feet) the pressure is converted to feet and deducted from the known length of the air line to determine the well water depth. The water column pressure is equal to the amount of air submerged. The resulting pressure supports the column of water from the water level in the well to the bottom of the tube. The air is then pumped out of the line until the gauge levels off indicating all the water has been forced out of the line. The top of the line is then fitted with a pressure gauge and a valve with a hand pump attached. The end of the line is attached low enough so it is submerged when the pump is operated at full discharge.īy noting the pipe joints, the depth of the air line can be determined. This is usually accomplished by securing the line to a known point on the pump column. The airline is kept airtight by hanging it vertically, making sure that it doesn't spiral inside the well casing. The exact length of the air line is measured as it is lowered into the well. Typically ¼ inch brass, copper, or steel tubing is used, although plastic tubing can also be used. Air is pumped into the line and excess air is forced out the end equalizing the pressure in the line with the water outside of the line. In this method, a small pipe or tube long enough to reach from the top of the wellhead to a point about 20 feet below the lowest anticipated water level is used. This method is appropriate for repeated testing of deep wells over 300 feet in depth. ![]() The wetted mark is subtracted from the mark at the casing to determine the actual depth of the water table. Then the tape is pulled to the surface to read the mark where the line is wet. The person taking the measurement will align and mark an even foot mark on the tape at the top of the casing. The tape is lowered into the well until a portion of the chalk is below the waterline. Eight to ten feet of the tape is dried and covered with carpenters chalk before each measurement. This method uses a 100-foot steel measuring tape with a lead weight attached to the end. To use this method you need to know the approximate depth of the water in your well. This method is best for measuring shallower wells. ![]() He then uses a tape measure to measure the distance between marks on the line. To determine a reading, the operator lowers the line until the needle deflects then reads the distance from the top of the water to the top of the casing on the line. When the end of the wire touches the water's surface, a current flows through the circuit. ![]() It consists of using a weight suspended on an insulated wire with depth markings and an ammeter to indicate a closed circuit. Using either an electric sounder or electric gauge to measure static water levels is the most practical method. The method used depends upon the type and depth of the well being tested.
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