1861.] Note on the Rain-Fall in the Mahanuddy Basin. 210 
*Theoretic discharge of the CuttacTc Rivers throughout the year in 1856. 
Month. 
Mahanuddy. 
Kajooree. 
Remarks. 
January, 
February, 
March, 
April, 

June, 
July 
August, 
September, 
October, 
November, 
December, 
17,581,881,000 
13,721,097,600 
9.490.953.600 
4.705.257.600 
8,538,998,400 
88.370.006.400 
506, 251, S14, 400 
676.590.844.800 
345,237,120,000 
220.090.780.800 
50,347,699,200 
25.211.606.400 
11,338,099,200 
9.739.440.000 
8,427,369,600 
6.026.400.000 
8.055.936.000 
73.856.448.000 
436.002.220.800 
622.331.164.800 
359,677,929,600 
226.476.172.800 
31.868.640.000 
19,227,001,600 
These calculations 
were made for every 
clay separately, of the 
year 1856. It is 
thought that the dis- 
charges for the flood 
season may be a 
trifle under-estimat- 
ed if any thing ; and 
those for the dry sea- 
son over-estimated. 
Total of each,... 
1,966,144,060,800 
1,803,026,822,400 
In the Mahanuddy, 
„ Kajooree, 
1,960,144,060,800 
1,803,020,822,400 
Giving the total annual discharge,... „ 3,769,170,883,200 
or about 3f billions of cubic feet ? 
Solution. — Dividing this amount of “discharge through the rivers,” 
Cubic feet, 
o 1 70 900 
by the “area drained,” we obtain Feet.’ Feet. ==3 '°° 4 feet 
45,000 x 5280 x 5280 
or 36 inches ; and supposing this amount as before to be J-th only of 
the “ actual rainfall,” this latter will, it appears, have been (36 -r- -f 
=) 90 inches. 
Theoretical calculations then, based on “ area of basin” and 
“ rainfall,” appear to corroborate the previous calculations, based on 
sectional area and slope of bed ; in direct proportion to the value of 
the subjoined probabilities. 
1 st. The probability of an average of nine inches of rain having 
fallen over the whole area of the Mahanuddy Basin in a single storm, 
towards the end of July, 1855 ; at which time the River was tolerably 
full of water. 
[* There are some clerical errors in these calculations.— Eds.] 
2 r 
