16,459,544,000 5,405,515,000 2,507,684,000 7,913,199,000
21,099,808,000 5,500,696,000 1,635,570,000 7,139,321,000
18,328,694,000 5,477,810,000 4,818,971,000 10,296,781,000
14,885,300,000 5,223,500,000
None.
15,895,364,000 $5,775,151,200
None.
14,898,419,000 6,511,826,900 2,917,977,000

5,223,500,000
5,775,151,200 $1,543,995,500
9,429,803,900

7,620,203,000 20,877,300
36 per cent.
8,560,096,000 23,453,900 47 per cent.
4,972,567,000 13,623,470 33 per cent.
5,642,480,300 15,416,610 35 per cent.
8,914,671,900

24,423,760

60

60 per cent.

Average. 51.05

Average daily waste for 20 years

. 7,460,600

Average daily yield of Lake water-shed for 20 years, 21,244,280.

45 per cent.

" 6 years, '52-59. 14,378,900

''

* Observations of Rainfall at Lake Cochituate commenced 1852, and these observations are assumed as correct for the whole district. † Lake raised two feet. “last 14 years, '60–73. 4,496,600 ‡ "last 14 years, '60–73. 4,496,600 Amount received from Sudbury River in 1872, 1,676,666,400 gallons.

Table of the average monthly and yearly heights of water in the Lake above the bottom of the Aqueduct.

High-water mark raised two feet.

Table showing the height of water in the conduit at the gate-house, Lake Cochituate, the number of days it was running at those depths, and the average depth for each month.

YEAR.

Annual Amount of Rainfall, in Inches, at Lake Cochituate, Boston and vicinity, 1849 to 1873, inclusive.

Providence, by A. Caswell.

Table showing the Rainfall in Boston for the year 1873, and the days on which it occurred, from observations by Wm. H. Bradley, Esq., Superintendent of Sewers.

54.94 inches.