RAINFALL AND DISCHARGE OF THE MURRAY RIVER. LXXI. 
A = Area of catchment in square miles. 
N = Number of days in month. 
Then 4) 2 eX Ni x18640056 17282 
te A x 640 x 43560 x 144 
'@) 
QA 
-= ‘000139 when N = 31 days, 
£ = ‘000134 when N = 30 days, 
x = 000129 when N = 29 days. 
£ = ‘000125 when N = 28 days. 
Example for January, 1900. 
Q = 1825 cusecs. 
A = 8300 square miles. 
N = 31 days. 
C 
© _ -990139 
A 
De ae gos 00189 = 2 siruneom inches 
A 
Darling River at Wilcannia.—The River Darling is cer- 
tainly unique both with regard to fluctuation of flow and 
low run-off. Its source is in the Dividing Range in Queens- 
land, and it forms the main line of drainage of the southern 
part of Queensland and western part of New South Wales. 
The tributaries of this river extend far into Queensland, 
and although of an intermittent character they feed the 
main stream with immense volumes in times of tropical 
rainfall. The New South Wales tributaries of the Darling 
rise in the Great Dividing Range, from which they flow 
westward through great alluvial plains which slope almost 
imperceptibly. The gathering grounds of the Darling 
embrace the immense area of about 235,000 square miles, of 
which 104,000 square miles are in the State of Queensland. 
Large non-contributing area.—The greater portion of the 
Darling Basin isso flat that it rarely contributes to the 
