Engineers Elnathan Sweet and Charles G. Witbeck have submitted to the common council an elaborate report for a water supply for the city of Watervliet, N. Y , formerly known, when a village, as West Troy. It is proposed to secure a supply of water from the Deepkill, about four miles north of Lansingburgh, and one mile south of Melrose, where it is intended to erect a storage reservoir, with a capacity of 100,000,000 gallons. The conduit will be laid from the reservoir, following the line of the Deepkill to the Hudson river, which it will cross about half a mile north of Pratt’s hotel on the Mechanicville road. Its course will then be south, along the road through Waterford, along King’s ditch to the Mohawk river, which it will cross above the State dam at Cohoes. It will pass through the latter city south along the Champlain canal, through Colonie to Twenty-sixth street, Watervliet, from which point the distribution pipes will start. The size of the conduit will be sixteen inches and the estimated capacity 5,000,000 gallons daily. The present consumption is estimated to be from 1,000,000 to 1.500,000 gallons daily. The length of the service mains is approximately eighteen miles— the present service mains are only twelve and three-quaiter miles, and this shows an increase of forty per cent. The preliminary estimate of the cost of the system to supply water by gravity to the city from the Deepkill, near Melrose, is as follows: For storage reservoir, 500 cubic yards excavation of rock, $£25; 20,000 cubic yards excavation of earth, $4,000; 7,00c cubic yards embankment, $2,100; 725 cubic yards concrete masonry, $4,500; 1,200 cubic yards rubble and masonry, $12,000; gatehouse, $1,500, crib apion to spillway, $800; thirty-five acres of land, 3,500—total $29,025. For conduit, 9,600 lineal feet sixteen-inch cast iron pipe, reservoir to Hudson river, $19,200; 800 fe«t sixteen-inch wrought iron pipe, crossing river, $4,000; 35.000 feet sixteen-inch cast iron pipe, ‘udson river to Waterford, $56,000; crossing side cut at aterford, $1.000; crossing Mohawk river at Cohoes $5,500— total, $85,700. For distributing sys.ems, 15,000 feet twelveinch cast iron pipe. $18,750; 25,000 feet eight-inch cast iron pipe. $20,000; 45,000 feet six-inch cast iron pipe, $29,250; 5,000 feet four-inch cast iron pipe, $2,750; io.oco feet cast irtn pipe under sidewalk, $5 000; six canal crossings, $5,400; one rock in trenches, $7,500; eighty tons special castings, $3,200; valves and hydrants, $7,500; total, $98,450; giand total. $213 175; add ten per cent, for engineering—total amount of estimate, $234,493.

A report from the water board was received as follows:

The plant of the West Troy Water Company consists of a pumping station on the Mohawk river, near Dunsbach’s ferry; a conduit from this station to two reservoirs on the bluff west of the city; a supply conduit from these reservoirs to the beginning of the distributing system at the head of Sixteenth street, and a system of distributing pipes in the city. The pumping station includes a stone dam, in two sections, across the Mohawk river, the sections at the pump house being 287 feet long and the section at the head of the island which divides the river at this point being 355 feet long; a pump house of stone about fifty by thirty-eight, inclosing two double cylinder horizontal pumps, run by two turbine water wheels, and having a nominal capacity of 80.000,000 gallons per day. Neither of these dams has been finished—the one at the pump house lacking about 120 lineal feet of coping and twenty or thirty feet of the front course under the coping. The other section has an unfinished gap near the middle of the dam about fifty feet long and about six feet deep. The effective head of water is also greatly diminished by an accumulation of broken stone in the tail-race from the wheels which run the pump. Though there was a two feet freshet in the river recently, the effective head was less than seven feet With the completion of the dams and the thorough cleaning of the tail-race, and the construction of a wing wall separating the tail-race from the river below the dam, a head of nine feet can probably be secured, when the surface of the pond is at the crest of the dam next the pump house. The pump house and one of these wheels and pumps are twenty-two years old; the other wheel and pump were put in eight years ago. Both are of antiquated design, and it is extremely doubtful whether they pump nearly as much water as they are rated for, on account of imperfect vacuum and leaky valves, even when the head of water is sufficient to run them to their proper speed. The conduit from the pump to the new reservoir is four and four-tenth miles long, and consists of 922 lineal feet of twelve-inch cast iron pipe, 7,160 lineal feet of sixteen-inch cast iron pipe, 750 lineal feet of twelve-inch spiral wrought iron pipe, 270 lineal feet of ten-inch cast iion pipe, and 6,208 lineal feet of eighteen by two-inch egg-shaped cement pipe. The cast iron pipe is doubtless in good condition. The spiral pipe and the cement pipe arc subject to frequent breaks, con tinual leaks, and are valueless. The reservoir into which this conduit first discharges is a small affair, recently finished,having a capacity ol about 6,000,000 gallons. Adjacent and southeast from this new reservoir is a reservoir constructed in 1876, having a capacity of about 70,000,000 gallons, which would be a valuable adjunct to this plant, if it had been properly constructed and protected from contamination. In its present condition, however, it is unfit for the storage of potable water. Leading from the new reservoir first described, a sixteen inch iron conduit extends along the shore of the large reservoir 2,700 feet, connecting with a twelve-inch cast iron conduit 300 feet long, which connects with the original service supply pipe from the old reservoir. This service supply conduit is of cement-lined sheet iron pipe, sixteen inches in diameter, for 2,900 feet from the old reservoir, and thence to the head of Sixteenth street, where the distributing service begins, a distance of 2.100 feet. It is of similar cement-lined pipe, twelve inches in diameter. The total length of the distributing service mains is twelve and seven-tenth miles, consisting of cement-lined sheet iron pipe and cast iron pipe, as follows: Of the former there appear to be 3 675 lineal feet, twelveinch diameter; 7,925 lineal feet, ten-inch diameter; 12.658 lineal feet, eight-inch diameter; 15,900 lineal feet of six-inch diameter; 4,525 lineal feet, four-inch diameter. Of the latter. 975 lineal feet eight-inch diameter; 6,150 lineal feet six-inch diameter; 15,305 lineal feet, four-inch diameter. The original installation of service mains was made entirely with the cement-lined pipes, and the small cast iron pipes now found, have been added from time to time to extend the service and improve the circulation. There are in the system seventy-two valves, 118 hydrants and two blow-ofT valves. The distribut ing system is seriously defective in the fact that it contains so large a quantity of cement-lined pipe now past the age at which most towns which have used it have found it necessary to replace it, and because of the too small size of a great part of the durable cast iron pipe which it contains. It is also very incomplete, having only one main line of supply for the whole city, and leaving some considerable section without service; having many dead ends and an insufficient number of valves and hydrants.

It seems from the report that, in many cases, the title of the water company to lands occupied by some portion of its conduits and reservoirs is incomplete. The report also makes it clear that, to render the property a serviceable and efficient means of supplying the city with water, the expenditure of a large sum of money beyond what the property in its present condition may cost is required. For that reason, the questior should be carefully considered whether the water derived from this source, carrying the sewage of the towns above the intake, is suitable for a domestic water supply.

The board of water commissioners sent a communication with the plans, in which it is claimed that, in the judgment of the members, the water supply from the source recommended in the report is in every way superior to the present supply, and the quality of the water is such that the board has no hesitancy in stating that it compares most favorably with the best water supplied to any city in the State.

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