So that the inconvenience in primitively monitoring the flow rate of leakage in a troublesome manner of an undersea tunnel can efficiently be overcome, a thoroughly rational and absolutely new technique has been developed based on analytical chemistry without relying on any physical mechanisms. Fundamentally, seawater is running into the undersea tunnel anytime through the year while groundwater is always seeping over there with a flow rate changeable with the season. Thus, the flow rate of the leakage, which is mixture of seawater and groundwater, just varies simultaneously with the groundwater flow rate. Additionally, the chemical species contained in the seawater are continuously diluted with the ground water with a flow rate dependent on the season. Therefore, the leakage flow rate can expectedly be calibrated with concentrations of the sea-originated species in the leakage. In any case, the working ranges obtained from calibration were prepared leaving good regression coefficients. The flow rates at a lot of spots in the tunnel were effortlessly and simply determined by employing this method to attain success and satisfaction without calling for the hard work.

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