The total capacity of delivery of the aqueduct is about 50 millions of gallons for 24 hours, but in case the lake is being reduced seven feet, by a discharge through the aqueduct, not more than 35 millions can be calculated on as the average delivery during that time. The flow of the Croton in ordinary low water exceeds 50 millions for 24 hours, and the minimum flow after long continued drought has been ascertained to exceed 25 millions, consequently, assuming the Croton at its lowest rate of flow, there would elapse 60 days before the lake would be reduced seven feet, and 60 days before the delivery of the aqueduct would fall below 35 millions of gallons in 24 hours.

In addition to this abundant supply, the water of the river at various parts for the distance of 15 or 20 miles could be dammed up, at a small expense, and large ponds made to discharge into the Croton, which would always furnish a supply far beyond the capacity of the aqueduct to discharge ; and the singular fact also exists, that a stream called the Ten Mile River, of very considerable supply of water, which now discharges into Long Island Sound, might be diverted or made to pass into the Croton. This fact is mentioned for its singularity, rather than from its being of any importance to the work. The lake, formed by the dam, flows already over some lands not embraced by the deeds or rights obtained by our predecessors and when it is considered that it is liable to rise ;