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TABLE II.-Showing-for each day in the year--(a) condition of water at Great Falls, receiv

ing reservoir, and distributing reservoir ; (b) height of water over dam at Greal Falls; (c) 9 a. m. pressure at Rock Creek.

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1.70
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1. 70
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1. 10
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90
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36 36 36 30 36 36 36 30 30 36 36 30 32

5 19 8 6 13 17 18 26 31 32 30 26 12 6 6 8

31.5
31.0
31.0
30.5
31.0
31.0
30.5
31.5
31.0
31.0
30.5
30.0
30,0
30.0
32. 0
30.0
30.0
30.0
30. 0
30.0
30.0
31.0
30.0
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29.5
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5 6 6 6 7 7 7 8 8 9 9 11 13 20 25 30 36 36 36 36

1. GO 1.81 1.80 1.60 1.40 1. 30 1. 20 1. 10 1.00 1. 00 1. 00 .90 .90 .90 1.00 .90 .80 .80 .80

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36 90
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36 1. 20
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36 1.10
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1. 10 36 1.20 30 1. 40 36 1. 70 36 1.70

1.70 36 1. 00 30 1. 50

29.5 30.0 29.5 29. 5 30.0 30.0 29, 5 29.5 29.5 29,5 30.0 31.0 31.0 30.0 29.0 20.0 29.0 34,0 29.5 30.5 30.0 30,0 299.5 29. 5 30.0 30.0 30.5 29.5 29.0 29 5 29.5

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6 6 12 31 36 36 36 36

30 36 30 36 36 36 36 30 36 36 36 36 36 30 36 36 36 36 36 36 36 36 36 36 36 36

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* Break in 36-inch main.

ENG 88-173

TABLE 3.-(Compiled from Table 2) showing number of days during which the water was

clear or turbid at the places indicated.

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TABLE 4.-1 Compiled from Table 2) showing number of days in each month in which

9 a. m. (pound) pressures were.

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* June 29, 18.5 pounds; June 30, 20 pounds; occasioned by break in 36-inch main.

List of appropriations made for the Washington Aqueduct, with the date of act for the same.

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NOTE.---Reverted to tho Treasury: $2.81, 2$46.25, 3$560.87, 435 cents, 5$1,109.87, 6$381.06, 7$1,354.17 ; total, $3,455.38. The balance, $3,961,701.62, being the amount expended to June 30, 1888. Since 1878 ono-half of the amounts appropriated have been contributed by the United States and the other half by the District of Columbia.

The money statement for the year ending June 30, 1888, is as follows: July 1, 1887, amount available.

$20,000.00 July 1, 1888, amount expended during fiscal year.

19,021.94 Jnly 1, 1888, outstanding liabilities...

978.06

20,000.00

The amount required for engineering, maintenance and repairs of the Washington Aqueduct, and its appartenances, for the year ending June 30, 1890, is $20,000, which sum, as shown by long experience, is that required for the aforesaid purposes.

Y Y 2.

INCREASING TIIE WATER SUPPLY OF THE CITY OF WASHINGTON, DIS

TRICT OF COLUMBIA.

This work was commenced pursuant to an act of Congress approved July 15, 1882, and includes as its salient features (1) raising the dam in the Maryland channel at the Great Falls of the Potomac, to an elevation of 148 feet above mean high tide at the Washington Navy. Yard, and its extension at that height across Conn's Island and the Virginia channel of the river; (2) extending the Washington Aqueduct from the distributing reservoir, near Drover's Rest, to the site selected for the new reservoir, near Howard University; the plan adopted for this extension being á tunnel under pressure 20,696.3 feet long; (3) constructing at the tunnel outlet a reservoir of about 300,000,000 gallons capacity; (4) connecting the new reservoir with the existing system of water-mains in the city of Washington by a new line of large mains.

Operations during the past fiscal year have been chiefly on the tunnel and reservoir, the dam having been finished in August, 1886, and the new mains laid up to the site of the reservoir in 1885.

The following is an outline of the history of operations during the year, and further details are given in the report of Lieut. C. McD. Town. send, Corps of Engineers, submitted herewith:

DAM AT THE GREAT FALLS.

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Operations on this portion of the work were completed, as before stated, during the fiscal year ending June 30, 1887, but the urgent deficiency bill passed by Congress early in the present session, and approved February 1, 1888, contained the following item of appropriation:

To enable the Secretary of War to pay to Chittenden Brothers, contractors, for money expended in the construction of a dam at the Great Falls of the Potomac, over and above that contemplated in the contract with said Chittenden Brothers, as amended, the sum of $15,000, payable from any unexpended balance of money appropriated for the construction of such dam.

In accordance with the foregoing, payment was duly made to the said Chittenden Bros. on the 11th of February, 1888. This was the only expenditure made on account of the appropriation for the dam during the past fiscal year, leaving on hand June 30, 1888, a balance of $4,665.52.

The total amount appropriated for this part of the work was $145,151, and the expenditures therefrom have been as follows: Paid to contractors for contract work, as per detailed statement in my last annual report......

$114,509.02 Paid to contractors, pursuant to special appropriation of February 1, 1883. 15,000.00 Total paid to contractors...

129, 509.02 Expenses of surveys, engineering, superintendence, etc.

10,976. 46 Balance available....

4, 665.52

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Total appropriation

145, 151. 00

TUNNEL FOR AQUEDUCT EXTENSION.

9

At the beginning of the fiscal year the tunnel had been “holed " through, 6,110 feet had been lined, and operations were in progress under Beckwith & Quackenbush, contractors.

Work under this contract was continued until September 30, 1887, but with a light force, on account of the small balance of money remaining on hand, and operations were limited to trimming and enlarg. ing the tunnel to the necessary lining section, and to placing the masonry lining in parts where the worst character of rock was found. Finally, the money having become about exhausted, all work of construction was suspended on the 30th of September, 1887, and the contractors were directed to clear the tunnel of all refuse and débris, in order to permit a final measurement of the work done by them up to the date of suspension. This having been accomplished, settlement was made with the contractors, including a payment of $78,279.51 of the amount that had, up to that time, been withheld as a retained percentage. This was done pursuant to supplemental articles of agreement dated December 5, 1887, which also provided for the care of the tunnel during the period of suspension of work, and for the prelimi. nary work of pumping the tunnel clear of water, as soon as a new appropriation by Congress should make a resumption of active operations possible. These articles were as follows: Supplemental articles of agreement entered into this 5th day of December, eighteen

hundred and eighty-seven (1887), between Major G. J. Lydecker, Corps of Engineers, U. S. Army, of the first part, and Clinton Beckwith and John V. Quacken. bush, partners, doing business under the firm name of Beckwith and Quackenbush, of Mohawk, of the county of Herkimer, State of New York, of the second part; these articles, now herein named, being in furtherance of and supplementary to certain articles of agreement entered into by the parties aforesaid, relating to the construction of a tunnel for increasing the water supply of Washington, D.C., on the 29th day of October, 1883, and to certain supplemental articles of agreement concerning the same, and between the same parties, entered into on the 18th day of October, 1886.

Whereas by reason of the exhaustion of appropriations heretofore made for the conduct of the work in question, it has become necessary to suspend active operations thereon under the original and supplemental articles hereinbefore referred to, and to the advantage of both parties therein concerned to make provisions for the protection of their mutual interests during the period of such suspension, which must endure until a further appropriation by the Congress of the U.S. makes a resumption of the work possible: Therefore,

This agreement witnesseth, that the said Major G. J. Lydecker, Corps of Engineers, for and in behalf of the United States of America, and the said Beckwith & Quacken bush, for themselves, their heirs, executors, and administrators, bave mutually agreed and by these presents do mutually covenant and agree, to and with each other as follows:

First. That, in consideration of the work already done to the satisfaction of the party of the first part, and of the further consideration that the entire work in contemplation can not be completed under any contract in which the parties of the second part are now concerned, the party of the first part shall surrender and pay to the parties of the second part the sum of seventy-eight thousand two hundred and seventy-nine dollars and fifty-one cents ($78,279.51) such sum being eighty-five (85) per cent. of the percentage heretofore retained and withheld from the parties of the second part, as à guarantee for the faithful performance of their work as provided in the original articles of agreement.

Second. That the parties of the second part may defer the removal of machinery, rubbish, and refuse material from the site of the work as provided in the original specifications relating thereto, until required to do so by the party of the first part, after an appropriation for the resumption of operations shall have been made by Congress; and when such removal shall have been effected to the satisfaction of the party of the first part, final payment of all sums justly due to the parties of the second part will be completed, but if sach removal shall not have been effected within thirty (30) days after being ordered the balance of all retained percentages or other moneys due

the parties of the second part shall be forfeited to the United States; provided the order for such removal shall not be given within five (5) days after the award of a ner contract for continuing work on the tunnel. And provided further, that no such order of removal will be given at that time. (1st) If the parties of the second part remain as contractors on the work, to complete it, or (2nd) if within the five (5) days aforesaid, they arrange with their successors on the work for the transfer to such successors of all responsibility in relation to such removal, in a manner and under conditions satisfactory in all respects to the party of the first part; whereupon, in either of these two cases, final settlement on account of contracts now existing will . be made in such manner ag may then to be found just and proper.

Third. That the pumping machinery at Foundry Branch and Rock Creek shafts shall be kept in proper working order for service at all times by the parties of the second part, so that it may be at any time put into active operation on the orders of the party of the first part; and to that end there shall be in daily service on the work one competent engineer (who shall also be a machinist), whose duty it shall be to care for such pumping machinery, and who shall receive as compensation for such service from the party of the first part the sum of sixty dollars ($60.00) for each calendar month, to date from the day on which these articles of agreement may go into effect, as hereinafter provided.

Fourth. That the party of the first part shall, at his option, put into active servico the pumping machinery at both or either of the two shafts named in the foregoing paragraph at any time during the suspension of work hereinbefore referred to, paying to the parties of the second part the sum of three dollars ($3.00) for each day of twentyfour (24) hours that each set of pumping machinery shall be in active use. It being understood that the party of the first part shall control and pay for all necessary operating expenses in connection with such active pumping operations.

It is understood and agreed that nothing herein contained shall be construed to release from, or add to, any obligation, liability, right, or duty devolving on either party under the operations of the two several articles of agreement, to which the foregoing are supplemental.

It is further understood that these supplemental articles of agreement are to become operative only when approved by the Chief of Engineers and the Secretary of War, and if not so approved to be void and of no effect whatever.

In witness whereof the undersigned have hereunto placed their hands and seals the date first hereinbefore written.

G. J. LYDECKER,

[SEAL.] Major of Engineers, U. S. Å.

BECKWITH & QUACKENBUSH. [SEAL.] Witnesses:

SIMON NEWTON.
John M. LASKEY.

OFFICE CHIEF OF ENGINEERS,

U. S. ARMY,

December 15, 1887. Approved.

Chas. W. RAYMOND,

Acting Chief of Engineers. (Second indorsement.)

WAR DEPARTMENT,

December 19, 1887. Approved.

R. MACFEELY, Acting Secretary of War.

After the suspension of work the tunnel was allowed to fill with water, thereby avoiding the expense of pumping operations and providing a moderate test of the strength of lining already constructed in resisting the outward pressure of water.

The act of Congress-general deficiency-approved March 30, 1888, included the following item of appropriation :

To enable the Secretary of War to complete the work of increasing the water supply of the city of Washington, under the act entitled “An act to increase the water supply of the city of Washington, and for other purposes," approved July fifteenth, eighteen hundred and eighty-two, namely: For completion of lining of the tunnel, two hundred and ninety-seven thousand seven hundred and fifty dollars; for complet

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