引言目前我国有成千以上的水文站,但大多数都是用水尺直接观察水位;在洪水时期,有时水文工作人员要冒生命的危险在波涛汹涌的河流上观读水位,读数也难正确,平常观读记载不方便,误差往往不容易免除,也不容易校正,就构成它的主要缺点,故此有必 At present, there are more than one thousand hydrological stations in our country, but most of them use water meters to directly observe the water level. During the flood period, hydrological workers sometimes risk their lives to read the water level on rough rivers and the readings are also difficult to read. Reading is not easy to read, the error is often not easy to remove, it is not easy to correct, it constitutes the main drawback, so it is necessary