114 



Surface and Underground 



Date. 





Quantity. 



January 



9 



0-839 



„ 



19 



0-569 



February 



7 



0-724 



,, 



18 



0-500 



March 



2 



1-180 



April 



1 



1-095 



>» 



15 



0-283 



>> 



24 



0-511 



1864. 



Duration of Rainfall. 

 During the afternoon, and till 9 p.m. 

 Between 3 and 9 p.m. 

 During 5 hours. 



„ a thunderstorm, in 1 hour. 

 „ „ lasting -|- hour. 



From 9 p.m. to 9 a.m. on the 2nd, rain showers 



at intervals. 



During one hour. 



„ 4 hours. 



Referring then to Table A, we find that the mean rainfall 

 in Melbourne for 17 years" amounts to 28*40 inches. 



The minimum quantity fell in 1843, viz., 21*54 inches, 

 and the maximum in 1849, viz., 44'25 inches. 



From Table B we find that the greatest quantity falls in 

 the spring, and the least in the winter season. 



In Table C we find that on the 23rd September, 1856, 

 0*92 inches fell during a thunderstorm in 20 minutes.* 



In Table D we find that the greatest quantity that fell in 

 any month during the six years was 7182 inches in Decem- 

 ber, 1863, and the greatest quantity in any one day was 

 2-436 inches on the 31st January, 1861. (See also Table E.) 



In Table F we find that 1-180 inches fell during 30 

 minutes on the 2nd March, 1864. 



TABLE G. 



The following Table shows the several areas drained by outlets A, B, 

 C, D, and E, their locality, and the mean amount of rain in 

 gallons and tons that falls annually on these respective areas. 



Imperial 

 Gallons. 



Weight in 

 Tons. 



530-35 340,731,206 1,521,121 



Outlet. Situation. Area in Acres. 



A. Falling into the river Yarra 



below the falls at Market- 

 street 



B. Falling into the Yarra above 



the falls at Prince's Bridge 248-2 159,459,763 711,874 



C. Falling into a culvert running 



under the Government Rail- 

 way Station at the west end 

 of Little Bourke-street, .and 

 subsequently into Batman's 

 Swamp 98 62,961,550 281,078 



* The heaviest rainfall known during the time the records have been kept 

 in Victoria. 



