| 摘要 |
An apparatus for measuring a water level of a dam by combining a pressure type water level gauge measuring the water level by detecting water pressure at a bottom of the dam, with a plurality of float type water level switches arranged along the depth of the dam and provided at an interval less than a tolerance allowed to the gauge. Obtaining a water level difference between the water level measured by the gauge and the water level at the switch respectively, the gauge water level is corrected to a water level obtained by subtracting the difference at one of the switches from the gauge water level, when a water surface of the dam is located between the one of the switches and the gauge or an adjacent switch. The abnormality of the gauge is found by detecting whether the difference exceeds a water level tolerance allowed to the gauge.
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