THE INTENSITY OF RAINFALL IN THE TRANSVAAL. 



By C;. W. Cox, F.R.Met.S. 



{With six text figures.) 



What would seem to have been the first observation on 

 intensity of rainfall in the Transvaal, was made at Doornfontein, 

 Johannesburg, on December i8th, 1896. At Joubert Park, in the 

 immediate vicinity, similar records date from a few days later ; 

 but the effort to obtain such data did not extend beyond these 

 two stations until the inception of the Transvaal Meteorolgical 

 Service in 1903. 



SEASONAL DISTRIBUTION OF RAINFALL AND FREQUENCY OF 



HEAVY FALLS. 



Fig. 1. 



The period covered Ijy the observations is therefore compara- 

 tively- short ; yet the data now amount to some mousancis in 

 number, and are fairly representative of all j)arts of the countrj-, 

 excepting the unhealthy regions of the Low \'eld. Rainfall of 

 no extraordinary intensity is, however, largely represented, and 

 it is necessary to eliminate observations of this nature us far as 

 possible. To effect this elimination, a somewhat arbitrary 

 method is adopted, falls being rejected as unworthy of s])ecial 

 notice when below : — 



0.25 inches in 5 minutes. 



0.30 ,. 10 



