| 摘要 |
A device for measuring and/or controlling ground water levels and a method of manufacturing such device. An embodiment of the device comprises a first tubular member having a top and bottom end and a plurality of perforations for allowing liquid, such as water, to enter and exit the device. A float dimensioned to be slidably received within the first tubular member is provided. The float has a top and bottom opening, both being in flow communication with each other. The device also comprises a check valve located inside the first tubular member for selectively passing liquid through the bottom opening of the float. Further, the device includes a second tubular member located inside the first tubular member. The second tubular member is in flow communication with the top opening of the float and extends upwardly through and out of the top opening of the first tubular member.
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