There have been no data at present which analytically checked water used for the extinction of fire by fire men.
So the volume of the water must be acquired in order to rationalise the extinction of fire by water. In this report the relations between the volume of the water obtained from the investigation of fires by Tokyo Fire Board and the destroyed area, the building structure, temperature, humidity, wind direction and velocity, the cause of breakout of fire, the extent of fire until water is poured and so on are analytically checked by the graphs. The fires adopted to this investigation amount to 347 in January, April and August 1949, December 1950 and March 1951.