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The officer in charge renews his request for an appropriation for the additional works required for restoring to use the receiving reservoir for the double purpose of improving the quality of our Potomac water by relieving it of the muddiness that it has in winter and spring, and of regaining the capacity for the storage of Potomac water that was lost when this important reservoir, which has a capacity of about 175,000,000 gallons, was thrown out of service by reason of the pollution by some small streams that lead into it; for the further improvement of the quality of the Potomac water by lowering the height of the , cross dam at the distributing reservoir; for the protection of the inlet to the aqueduct at Great Falls; for extending an important wasteweir, which is liable to be obstructed by the private owners of adjacent land; for cleaning out the distributing reservoir, and for the purchase or condemnation of a site for a storage yard for supplies for use in case of breaks in mains.

He also calls attention to the necessity of widening and deepening the spillway from the receiving reservoir; of rebuilding the bridge over this spillway; of repaving Griffith Park and Cabin John bridges; of a storehouse at Great Falls; of protecting the conduit at wasteweir No. 1; of inserting air valves and blow-off valves in the old mains, and of completing the removal of the accumulation of deposits from the conduit as soon as money can be obtained for the purpose.

These objects and the desired general provision of law relating to appropriations for the Washington Aqueduct, as well as the small increase asked for in the general appropriation for preservation and repair of the aqueduct and its accessory works, are of great importance, and the renewal of the recommendations of the ofticer in charge in respect of them is concurred in. July 1, 1891, balance unexpended

$23, 944. 25 June 30, 1892, amount expended during fiscal year

21, 705. 74 July 1, 1892, balance unexpended

2, 238.51 July 1, 1892, outstanding liabilities

2, 238.51 The estimates of the officer in charge for the fiscal year ending June 30, 1894, are as follows: For improving the receiving reservoir by the works required for cutting

off the drainage into it of polluted water and sewerage from the surroan ding country for the purchase or condemnation of the small amount of land required for the purpose, and for the excavation neces

sary at the head of the reservoir.. For improving the receiving reservoir by deepening its margins and pro

$150,000 tecting them by slope walls

140, 625 For lowering the height of the cross dam at the distributing reservoir... For protecting the inlet to the aqueduct at Great Falls.

12, 500

5, 000 For extending the outlet of wasteweir No.3

2, 500 For purchase or condemnation of a site for a storage yard.

10,000 For cleaning out the distributing reservoir...

13, 825 For widening and deepening the spillway at the receiving reservoir

2,000 For repaving Griffith Park and Cabin Jolin bridges For storehonse at Great Falls.

5, 000

1,500 For protecting the conduit at wasteweir No.1, near Great Falls

5,000 For inserting air valves and blow-off valves in the 36-inch and 30-inch mains

6, 250 For removing the accumulation of deposits in the conduit...

14, 000 For rebuilding the bridge over the spillway at the receiving reservoir...

18,000 For maintenance and repairs of the aqueduct, the reservoirs, mains, roads, etc., connected therewith....

21, 000 Total.......

407, 200 (See Appendix A A A 1.)

2. Water supply, District of Columbia; the 48-inch main.The work of laying the 48-inch main, for which $575,000 was appropriated by the act of March 2, 1889, the laying of the 30-inch mains in East Capitol street and in New Jersey avenue Northwest, and the 24-inch mains in Eleventh street Northwest, in K street Northeast, and in Eighteenth street Northwest, which were done by means of the same appropriation, had been completed at the close of the last fiscal year.

The remainder of the appropriation, amounting to $10,669.91, remaining in the hands of the officer in charge, was turned into the Treasury on the 9th of September, 1891. July 1, 1891, balance unexpended...

$10, 866.58 June 30, 1892, amount expended during fiscal year

196. 67 July 1, 1892, balance unexpended...

10, 669.91 July 1, 1892, outstanding liabilities

81. 40 July 1, 1892, balance available

10, 588.51 As far as can be foreseen the available remainder of the appropriation will not be required for future expenditure.

(See Appendix A A A 2.)

3. Increasing the water supply of Washington, District of Columbia.This work was commenced under an appropriation made in the act of Congress approved July 15, 1882.

All operations on this project are suspended, and no work has been done under it during the year.

The work of replacing the decayed timber linings of the upper portions of the tunnel shafts, which was in operation at the close of the last fiscal year, was continued, and completed early in the year. The work consisted in making an entirely new lining of the best quality of Georgia pine, extending either from the surface of the rock, as at Foundry Branch shaft (which was completed in the previous fiscal year) and Champlain avenue shaft, or from the top of the brick lining that had been carried at the Howard University shaft to within about 20 feet of the surface of the ground.

At Foundry Branch shaft the new lining was of 3-inch plank set behind horizontal frames of 10-inch by 12-inch timbers 2 feet apart. At Champlain avenue and Howard University shafts the lining was built solid of 10-inch by 12-inch timbers.

The interior stone lining, “pitching," of the new reservoir near Howard University having been considerably injured by drainage water from ground around the reservoir, which found its way to the bottom of the reservoir under the stone and undermined it, it was found necessary to cut off these streams, and several small retaining walls were built to prevent further damage. About 715 square yards of the stone lining of the reservoir, which had sunk from the washing out of the sand under it, was repaired. A guard strainer, 6 feet square, composed of 2-inch Georgia pine plank, was built around the inlet mouth of the 12inch drain under the dam to prevent a possible disastrous obstruction of this drain. A masonry wing wall was built on each side of the mouth of the great sewer which passes around this reservoir for the protection of the mouth, and the earth which had been washed away refilled back of the wall and over the sewer.

A watchiman has been employed during the year at the new reservoir. Iis duties have included the guarding of the stone at the mouths of all of the shafts except the one at Foundry Branch, which is under the care of the watchman at the distributing reservoir.

July 1, 1891, balance unexpended on all items of appropriation
June 30, 1892, amount expended during fiscal year.

$133, 792.47

3,466.94

July 1, 1892, balance unexpended
July 1, 1892, outstanding liabilities

430, 325, 53

146.08

July 1, 1892, balance available......

430, 179.45 No estimate for further appropriation is submitted. (See Appendix A A A 3.)

4. Erection of fishways at Great Falls.At the commencement of the fiscal year operations were in progress under the contract entered into June 9, 1891, with Isaac H. Hathaway, of Philadelphia, Pa., for the construction of fishways at Great Falls, the plans and specifications for which had been prepared by the Commissioner of Fish and Fisheries, as contemplated by the act making appropriations for the same.

By direction of the Secretary of War, the engineer officer in charge is held responsible only for the proper protection of the aqueduct dam at Great Falls and for the disbursement of the funds appropriated.

The Commissioner of Fish and Fisheries having discovered that his plans for section 6 of the fishways were not adapted to the site of the work, new plays and specifications were prepared by him for this section, and on the 10th of September a supplemental contract was entered into with the contractor for the work under the new plans for section 6.

By the terms of the contract the work was to have been completed before December 12, 1891; but the contractor, finding that this would be impracticable, asked for an extension of time to July 1, 1892, and this was granted him; the additional expense to the United States by reason of such extension being deducted on final settlement, as provided for in the contract..

By reason of the uncertainties as to the amounts of excavation, concrete, and riprap work that would be found to be required to completely finish sections 4, 5, and 6 of the fish ways, and of a doubt whether all of this work and the superstructure of section 4 could be completed, as was greatly to be desired, before the next spring freshets, with the appropriation available for the fishways, after paying the contractor the amount then due him (the contract provided that the excavation, the concrete, and the riprap were to be done at rates per cubic yard), it was deemed advisable to enter into a supplemental contract with the contractor to completely finish section 4, and to finish all the work remaining to be done on sections 5 and 6 at a lump sum which was within the amount of the appropriation remaining available. This agreement was entered into on the 22d of December, 1891.

There remain to be done sections 1, 2, and 3 to complete the fishways, for which the Commissioner will prepare modified plans, and for which $15,000 was included in the estimates submitted in my last annual report. July 1, 1891, balance unexpended

$29, 871. 18 June 30, 1892, amount expended during fiscal year

29, 826.29

July 1, 1892, balance unexpended..
July 1, 1892, outstanding liabilities.

47. 89 2.93

44.96

July 1, 1892, balance available
(See Appendix A A A 4.)

ENG 92—27

IMPROVEMENT AND CARE OF PUBLIC BUILDINGS AND GROUNDS,

AND CARE AND MAINTENANCE OF THE WASHINGTON MONUMENT, IN THE DISTRICT OF COLUMBIA.

Officer in charge, Col. O. H. Ernst, major, Corps of Engineers.

The various improved parks and reservations have received the care and attention required to maintain them in good condition.

The Washington Monument received necessary attention. A new set of cables for the elevator was placed, and the improvement of the surrounding grounds was completed as far as available funds would permit.

Additional buildings were erected in the nursery grounds. About 486,000 plants were propagated in the greenhouses during the year, nearly all of which were set out in the public grounds in May and June.

In the Smithsonian grounds and Judiciary Square additional asphalt road pavement and footwalks were constructed. In Lafayette Square additional asphalt footwalk was laid.

A granite curbing was placed around Lafayette Square. A granolithic pavement was laid upon the sidewalk on Pennsylvania avenue in front of the Executive Mansion grounds.

McPherson Square was entirely remodeled.

Reservation No. 34, on the north side of Pennsylvania avenue between Seventh and Eighth streets west, was also remodeled.

Reservation No. 20, at the intersection of Pennsylvania avenue, Twenty-eighth and M streets northwest, was improved.

The circle at the intersection of Massachusetts and New Jersey avenues and First and G streets northwest was inclosed with an iron post-and-chain fence, and some trees were planted.

Eight hundred and forty-three feet of additional water pipe was laid in different parts of the public grounds during the year.

In the Executive Mansion some floors of Portland cement were laid in the basement, extensive improvements were made in the laundry and the bath-rooms, some of the apartments were redecorated, new carpets and window draperies purchased, some of the furniture renovated, and the work of introducing electric lights completed. The stone balustrade above the cornice on the east end of the Mansion and a portion of the east porch were considerably damaged by a severe storm in November. Necessary repairs were made to the greenhouses connected with the Mansion.

Attention is invited to the detailed report of the officer in charge, and to his estimates for the coming fiscal year, as follows: For improvement and care of public buildings and grounds...

$184, 022 For compensation of persons employed on public buildings and grounds. For replacing the overhead system of telegraph wires with duplicate six

conductor underground cable, and for care and repair of existing lines. For contingent and incidental expenses of public buildings and grounds. 500 For care of Washington Monument and maintenance of elevator: Salaries of employés ...

$9,060 Fuel, light, contingencies, etc.

3,600

12, 660

55, 680

32, 500

285, 362

(See Appendix B B B.)

PRINTING AND DISTRIBUTION OF CHARTS OF THE NORTHERN AND

NORTHWESTERN LAKES, AND SURVEYS MADE FOR THE PURPOSE OF KEEPING THESE CHARTS UP TO DATE.

Under the supervision of this office additions have been u ade to the engraved copper plates of charts of

Lake Superior, Nos. 1, 2, and 3; River Ste. Marie, Nos. 1 and 2; Straits of Mackinac; North end of Lake Michigan; South end of Lake Michigan; Beaver Island group, Lake Michigan; North end of Green Bay; South end of Green Bay; Lake Michigan coast chart Nos. 2, 3, 5, 6, 7, 8, and 9; Grand and Little Traverse bays, Lake Michigan; Lake Huron; Saginaw Bay; Detroit River; Lake Erie; Lake Erie coast chart Nos. 2, 3, 4, and 5; Lake Ontario coast chart Nos. 2 and 5; St. Lawrence River, No. 4; St. Lawrence River, No. 5. Corrections and additions to quite a number of other plates have been ordered, and work thereon is progressing.

During the year 5,801 charts were distributed under the supervision of Col. O. M. Poe, Corps of Engineers, at Detroit, Mich.; of these 5,113 were sold at 20 cents each, and 19 at 10 cents each, and the amount of $1,024.50 turned into the Treasury. In addition, 19 charts at 20 cents each were sold at this office, and the sum of $3.80 was deposited in the Treasury. The total amount received for the sale of charts was, therefore, $1,028.30. The total appropriation for printing and distributing these charts was only $2,000.

Were it not for the fact that the distribution is made from an office already organized for river and harbor work, the necessary supply of charts could not be printed and distributed with so small an appropriation.

During the fiscal year surveys were made as follows:

St. Marys River from White Fish Bay to Detour Light-House.--A proj. ect for this survey having been submitted at an estimated cost of $64,080, orders were given directing Col. Poe to expend the available balance of the appropriation in commencing the work. Active operations were hegun May 22, 1892. By the close of the fiscal year a base line had been measured, the triangulation was planned starting from the base line through six stations, and angles at four of these stations were satisfactorily measured; observations were made for primary azimuth; a line of precise levels was run from St. Marys Falls Canal lock to Bay Mills on the Lake Superior level; a water gauge was established at this latter point, and observations taken to determine the fall in the water surface above the canal; hydrographic work was begun in the vicinity of Sailors Encampment, and considerable progress was made. Every possible use has been made of all former work done in this locality, at the time the river was originally surveyed and charted, and also at the time of the river improvement survey of 1879; the records of both surveys are in the hands of the Engineer Department, and all duplication of Government work is thus avoided. A number of instruments formerly used by the survey were put in good condition and shipped to the locality, and everything is now in readiness to push the

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