Water Board, and the route No. 5, on the general plan, showing the routes, was finally decided upon. Some additional surveys were made to show the feasibility of constructing a road over this route, and several propositions were made by the Water Board to the town authorities of Brookline; but the project was finally abandoned, and the land necessary for the pipe route was taken, under the act of the Legislature, giving the city authority to lay the pipe.

"In addition to these special surveys, the current work at the reservoir was continued without intermission. Lines and grades were given for every piece of embankment, for the drain, the main pipe, the gate-houses, driveway, etc., and a constant supervision exercised by the engineer over the work, that no unsuitable material should be used in the embankments or gate-houses, and that the construction should in all cases conform to the plans. Monthly estimates were made of the amount of slope wall built, the amount of clay delivered for puddling, and of coping stone for the slope wall. Estimates, involving a great amount of labor, were made at three different times, of the cost of completing the reservoir. Levels were taken over the bottom of both basins, and their capacity calculated for each inch in depth, and tables made containing the length of water line, area and capacity for each inch in depth, and the total capacity for each inch in depth.

"In addition to the work done at the reservoir, plans, specifications, and contracts were drawn in this office for building the gate-houses, for the main pipe and its connections, for the stables and other temporary buildings at the reservoir.

"The engineering force at this reservoir consisted for the larger portion of the time of the resident engineer, one assistant engineer, two rodmen, and one axeman, which was, I think, smaller than any force ever employed on a work of its size and importance.

The resident engineer was twice obliged to change his assistant, once by the illness and subsequent death of his assistant, Samuel C. Horn, and the second time by a severe accident to his assistant, Wilbur F. Learned, who, while giving a line for the building of the effluent gate-house, fell from the wall, a distance of about twenty feet, causing such injuries that he was disabled for a period of six or seven months.

The lower or Bradlee basin of this reservoir was completed and the water let into it on the 25th of October, 1870, and the branch office of this department at the reservoir, for five years under the charge of Henry M. Wightman, the resident engineer, was discontinued on the 10th of November."

As before stated the water was let into the "Bradlee basin " on the 25th of October, and on November 26th there was a depth of 1 foot 9 inches of water above the lower floor of the effluent gate-house. Owing to the low stage of the water at the lake the quantity admitted from the conduit was very small until after the danger of a scarcity at the lake was over. The depth, however, gradually increased from springs and rain-fall, and no signs of leakage have even yet appeared. On the 1st of January, the depth of water was 2 feet 8 inches; on the 1st of February, 3 feet 4 inches; on the 1st of March, 4 feet 5 inches; on the 1st of April, 9 feet 10 inches, and on the 1st of May, 14 feet 2 inches.

Statement showing amount of Rainfall on Water-shed of Lake Cochituate, amount of Water consumed and wasted, ceived into Lake, available percentage of Rainfall, etc., from 1852 to 1870, inclusive. Water-shed of Lake

YEAR.

Rainfall.

Amount of Rainfall Amount of Water Amount of Water Total amount con- Rise of Lake dur-Fall of Lake dur-
on Water-shed of
consumed. wasted from Lake. sumed and wasted.
Lake Cochituate.

ing the year.

ing the year.

Total available
amount of Rain-
fall received into
Lake.

1856

55.86 18,366,561,000
43.15 14,187,562,000 3,614,230,000
34.96 11,494,719,000 3,776,399,500
40.80 13,414,892,000 4,409,787,600

3,166,417,500

6,284,357,000

239,580,000

6,523,937,000

17,873,800

35 per cent.

4,187,733,020

7,801,963,020

217,800,000

7,584,163,020

20,778,529

53 per cent.

No acc't kept.

326,700,000

No acc't kept.
63.10 20,747,052,000 4,644,990,000
15,270,890,000
10,625,900,000
48.66 15,999,232,000 4,689,155,000
6,623,655,000
1,934,500,000
16,117,602,000
49.02
4,808,875,000
12,377,875,000
7,569,000,000
55.44 18,228,471,000 6,309,108,000
6,309,108,000
None.
10,016,654,866
15,269,303,000 6,639,095,900 3,377,558,966
49.69 16,337,890,000
6,092,200,000
6,059,000,000 33,200,000
69.30 22,785,586,000 5,927,052,500
8,092,748,970
2,165,696,470
42.60 14,006,726,000
7,474,052,700
6,105,306,700 1,368,746,000
49.46 16,262,266,000
62.32 20,490,455,000

Average daily capacity of Lake as a source of supply for 17 years 21,821,300.❘ 46 p. c. av.

* Observations of Rainfall at Lake Cochituate commenced 1852, and these observations are assumed as correct for the whole district. † Lake raised two feet.

Consumption of Water. Daily Average Number of Wine Gallons drawn from the Brookline Reservoir.

MONTH.

1849.

1851.

1852.

1853.

1854.

1855.

1856.

1857.

1858.

January

1,700,000

1,550,000

3,600,000

June

4,300,000

7,233,700 8,280,900 8,050,500 10,695,200 9,702,700 12,669,000
7,221,100 8,790,300 8,643,600 10,654,200 10,349,800 12,791,000 14,175,000 14,399,000
6,137,900 8,521,100 8,202,200 9,582,100 10,125,600 12,504,000 13,941,000 14,154,000
4,961,000 5,365,200 8,048,700 7,903,600 8,738,500 8,540,000 10,800,000 12,454,000 13,465,000
5,346,100 6,238,400 8,350,000 8,123,400 9,685,300 9,103,800 10,378,000 12,414,000 | 11,423,000
6,906,500 7,925,000 8,033,100 8,945,900 11,745,200 9,984,400 11,223,000 12,504,000 10,867,000
4,800,000 8,514,200 7,180,200 9,608,000 8,809,200 10,613,800 | 11,056,600
11,056,600 | 13,167,000 13,551,000
4,100,000 8,004,600 7,235,000 9,709,300 8,461,900 10,028,100 11,120,800 12,664,000 13,077,000
4,800,000 6,585,500 7,230,600 7,920,000 8,640,700 9,712,400 11,710,800 11,522,000 12,030,000
4,550,000 4,504,300 6,716,600 6,930,000 8,871,100 8,769,800 10,771,200 11,891,000 10,864,000
3,800,000 4,960,500 6,473,500 6,637,900 8,624,700 8,030,200 10,383,200 11,691,000 11,372,000
3,600,000 5,037,000 7,663,400 7,195,800 9,228,400 10,597,600 11,307,200 13,284,000 11,241,000

15,089,000 12,160,000

Average for Year

3,680,000

6,883,800 8,125,800

8,542,300

9,902,000 10,346,300 | 12,048,600 12,726,000 12,847,000