Abstract
Sizes of about 167, 000 raindrops in 31 rainfalls are measured by filter paper method. The time-average distributions of raindrops with size during about an hour of each rainfall are examined and classified into four types, according as in what degree they are discrepant with the equivalent Marshall-Palmer distribution which has equal rate of rainfall to them.
A-type shows the distribution almost similar to the equivalent M-P-distribution except the deficiency of drops smaller than 1.4mm in diameter.
B-type shows the excess of drops larger than about 1.8mm, especially at the largest end of dropsizes, and remarkable deficiency of drops smaller than about 1.6mm. Notwith-standing the excess of relatively large drops, the rain of this type has slight rate of precipitation, not exceeding 3mm/hr.
C-type shows the excess of middle size drops in comparison with the equivalent M-P-distribution.
D-type shows the excess of drops smaller than 1.4mm as compared with the equivalent M-P-distribution.
