A rise, or additional head at Fourteenth-street, (as a starting point,) of three feet, would give the necessary head to make the water flow over the surface of the highest streets in the city, and would give an excess of head over four-fifths of the section of the city referred to, of at least fifteen feet. But as a reservoir would be necessary to hold the supply of water, an additional head of 20 feet is proposed to be in this manner obtained for 2,000 hogsheads (equal to twenty cisterns,) which will be contained in a reservoir.

This quantity of water, with that held in the tubes, would give an ample supply for any fire.

Your Committee propose to lay one line of tubes from about Fourteenth-street, through the Bowery to its termination at Chatham-street, a distance of about 6500 feet ;

and also a line of tubes commencing at the same place, through Broadway to Canal-street,

106 MEMOIR OF THE a distance of 5500 feet. The diameter of the tubes to be 12 inches. The cost of the tubes will be $1 14 cents per foot, or 6.020 per mile. The expense of. laying down will be eighty-six cents per foot, or $4640 per mile. The distance of these two lines will be about 12,000 feet, or 2 miles and the aggregate expense of tubes, laying down, and ;

$500 for plugs or hydrants, will amount to $24,500. The expense of a wooden reservoir containing 2000 hogsheads, (equal to twenty cisterns,) it is estimated would not exceed $1500, making in all $26,000. -It is believed that the power of a single horse will be sufficient to pump the water into the reservoir, and the annual expense of a horse and a man ought not to exceed $700.