THIRD QUESTION-POSSIBLE NEW SOURCES OF SUPPLY.

A careful study of the maps and a review of the suggestions of many, reveal only the following reasonable possibilities, which are stated in the order of their proximity and economy. These various watersheds are shown on Map No. 1, next the front cover. For close study reference must be had to the larger scale topographical maps of the U.S.Geological Survey.

First--THE TEN MILE River.

The Ten Mile river territory lying immediately northwest of the Croton Watershed, with a dam at Webatuck, will cheaply add a safe daily supply of 150 million gallons, equivalent to about ten years' increase at the recent rate of growth for Manhattan and The Bronx only, or equivalent to about seven years' increase, or sufficient until 1907, if Brooklyn and Queens must also share in it. The Ten Mile has the great advantage that merely opening the sluice-gate to be provided at Pawling, it would deliver this water into the Croton Watershed, whence it could run down the stream into Croton Lake and be used in connection with the Croton sources or be conveyed to the city in part through the Old Croton Aqueduct.

The Old and New Croton Aqueducts have a combined capacity when clean of about 380 million gallons per day, which is 105 millions more than the safe maximum yield of the Croton Watershed; thus leaving a moderate surplus of carrying capacity, subject to some impairment when the aqueducts are not clean, which for a few years could be availed of in carrying a part of the Ten Mile water.

The waters of the Ten Mile river, diverted as proposed, would flow down into the present Croton East Branch Reservoir. This reservoir, fortunately, is at an elevation sufficient, without material sacrifice of storage capacity, to supply an aqueduct line to New York with the 150 million gallons of Ten Mile water, plus the 50 million gallons that the Croton East Branch itself will yield, or 200 million gallons per day, in all, by gravity flow at such a level that it will at the city limits have a head equivalent to an elevation of 300 feet above the sea; thus affording the same elevation tendered by the Ramapo Company, but in my estimates of cost I have provided for a large terminal reservoir near the city limits, for which no equivalent is found in the Ramapo proposition.

The Ten Mile Watershed can be utilized either by itself by a dam at Webatuck, independently of the Housatonic and the Upper Housatonic added later, at that time practically throwing away the cost of the Webatuck

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