Abstract
The author discusses the theoretical ground for application of Gibson's method of measurement of discharge of a hydro-electric power station equipped with a surge tank of special type (see Fig. 1). This surge tank has a riser pipe of considerable length and the length of penstock is short. Four different methods were proposed and discussed, and it was decided that the fourth method, which records water pressure at a point of penstock directly in front of water turbine, and estimate the discharge by calculation, is most suitable for practical purpose. In Feb. and Oct. 1952, efficiency tests of water turbines at Hiraoka Hydro-electric Power Station (Tenryu River) were carried out on this principle, and fairly statisfactory result was obtained.
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