This paper describes mathematical theory and laboratory experiment of the flood wave in uniform open channel. The theory is developed by the method of successive approximations with respect to a small parameter σ which is defined by σ=√-F(O)/g/S₀, whree F (O) denotes the vertical accelerative rate of rising of the stage of the flood wave at the moment of passage of its crest at a cross section of the channel, g the intensity of gravity and S₀ slope of the channel. The laboratory experiment was conducted primarily for the verification of the theory. Flood wave with any desired value of σ was generated in flowing water with any desired value of Froude number and specifically the rate of attenuation and the speed of propagation, both of which were related to the crest of the wave, were measured and are compared with those given by the theory.

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The past studies on flood flow of river have mainly dealt with its phenomenon at some given point and not so many with the exact and precise relations of the phenomena between the up-and downstreams. Hence the actual state of flood has not yet been clarified throughly.
Referring to the flood characteristics of large river, the auther made an experiment concerning the flood at the Shintakase river, a tuributary of Uji river (in Fushimi-Ku, Kyoto City) to examine the actual state of flood flow.
In, this paper, some of the results obtained from the experiment are explained.

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If we try to slove the problem of seepage through dams which have core walls, we are necessarily forced to clarify the true phases of seepage through dams which slant to the upper and the lower stream sides, especially free surfaces in the dam sections. Such free surfaces have quite different characteristics as compared with those in rectangular dam section. With regard to such free surfaces, no paper have ever been made public yet. This paper, however, explains this problem basing on the writers original idea.

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This paper is a report about the variation of the strength of natural soil by disturbing. Measurements of the strength have been carried out by mechanical liquid limit device and direct shear machine. The strength of natural soil decreases by disturbing and this state of decrease is considerably affected by the method of disturbing.

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In this paper, the author has studied on the dissipative effect of sand on the propagation of sound waves, and compared the experimental result with the theoretical conclusion of the propagation of sound in the capillary pipes with viscous absorption. The author obtained the value of the equivalent diameter of a capillary pipe for the sand layer of loose packing.

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No reasonable and desirable calculation formula has been provided up to this time for the stress caused by earthquake in the hollow cylindrical shell. Therefore, in this paper the author proposed both of general and practical calculation formulae of stresses due to the forced vibration, solving the well-known three simultaneous equations of motion, and introduced the stress calculation graphs by means of which the stresses caused by earthquake in the reinforced concrete hollow cylindrical structures can be calculated. In addition, some discussion was given to the damage of the fodder storage silos which was damaged by the great earthquake of 1952 at the southeastern district of Hokkaido so called Tokachi-Oki Earthquake.

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