Notes on Hydrology. 93 



'On examining monthly rainfall I find there was — 

 No rain 1 month in 1865 

 1 * 1878 



1 „ 1880 



43 months under J inch 

 35 „ J inch to 1 inch 

 78 „ 1 „ 2 inches 

 52 „ 2 inches to 3 „ 

 28 „ 3 „ 4 i, 

 6 „ 4 „ 5 .,, 

 6 „ 5 „ 6 „ 

 4 „ 6 „ 7 „ 

 1 month over 7 inches, which was Oct., 1870. 

 During the same period — 

 Upwards of 1 inch fell in 24 hours 59 times 

 2 inches „ 24 „ 10 



3 „ 



„ 24 



» 



5 „ 



2 „ 



„ 48 



55 



17 , 



4 >, 



„ 48 



5) 



1 time. 



March 15th and 

 [16th, 1878. 



Our rains are heavier than Melbourne,, but not so heavy 

 as Sydney, and they are heavier still in Queensland. 



I believe the heaviest rain of short duration in Melbourne 

 was 10th March, 1877, when 1 inch fell in 15 minutes ; 

 rate. 4 inches per hour. 



At Ballarat, February or March, 1876, 1*81 inch fell in 

 20 minutes ; rate, 5*43 inches per hour. 



At Sandhurst, of which I have any record, 12th December, 

 1875; '5 inch in 5 minutes ; rate, 6*0 inches per hour. 



At Sydney, August, 1878, 1 inch fell in 6 minutes ; rate, 

 10 inches per hour. 



The heaviest 24 hours' rain recorded in — 

 Sandhurst, 3*67 inches, occurred 16th March, 1878 

 Melbourne, 310 „ „ 9th December, 1860 



Beechworth, 6*00 „ in 30 hours, occurred 31st Aug., '75 

 Sydney, 20'41 „ occurred 15th October, 1844, 



when 5 "4 inches fell in 2 hours. 

 Adelaide, 315 inches, on 4th April, 1860 



The following are also a few exceptionally heavy rains — 

 Townsville (Qld.) 20 inches in 3 days, 25th Feb., 1877 

 -Sydney ... 172 „ 30 minutes, 6th Feb., 1878 



„ ' ... 10-88 „ 48 hours, 7th Feb., 1878 



7-00 „ 4 hours, 5th April, 1882 

 Adelaide ... 7'8 „ 10 days, June, 1848 



