PRESSURE WATER LEVEL GAUGE AND METHOD FOR MAINTAINING PRESSURE WATER LEVEL GAUGE

摘要

Provided are a pressure water level gauge capable of limiting earth and sand accumulation with a simple configuration and a method for maintaining the pressure water level gauge. The pressure water level gauge (10) is provided with: a water level-detecting sensor (11); an inner wave-breaking pipe (12), which is installed on a concrete retaining wall (1) of an intake dam of an inflow-type power plant so as to be extractable and on the bottom surface of which the water level-detecting sensor (11) is installed; an outer wave-breaking pipe (13) set so as to surround the inner wave-breaking pipe (12); and synthetic resin drainage material (14), which is filled between the inner wave-breaking pipe (12) and the outer wave-breaking pipe (13) and limits the accumulation of floating earth and sand that enters between the inner wave-breaking pipe (12) and the outer wave-conveying pipe (13) from the open surface of the outer wave-conveying pipe (13), and the water conducting property of which has been secured.