HYDROLOGY OP NEW YORK 



683 



The Ridgewood system comprises the works originally built 

 to supply Brooklyn, and their tributary catchment embraces that 

 portion of Queens county bounded on the north by the ridge 

 forming the backbone of Long Island; on the east, approxi- 

 mately by Suffolk county; on the south by the salt meadows 

 bordering on Hempstead and Jamaica bays, and on the west 

 by Kings county. The original catchment area is 66 square 

 miles, while the new catchment is 89 square miles. 



The sources of supply on the old catchment, named in order 

 from the Ridgewood engine house eastward, are as follows: 



Spring creek temporary driven-well station, Spring creek 

 driven-well station, Baiseley's driven-well station, Baiseley's 

 pond, Jameco driven-well station, Springfield pond, Forest 

 Stream driven-well station, Simonson's pond, Clear Stream pond. 

 Clear Stream driven-well station, Watt's pond and driven-well 

 station, Valley Stream pond, Smith's pond, Pine's pond, Hemp- 

 stead pond, Schodack brook and Hempstead storage reservoir. 



On the new catchment the sources of supply from the Mill- 

 burn engine house eastward are: 



Millburn pond, Agawam driven-well station, East Meadow 

 pond, Merrick driven-well station, Newbridge pond, Wantagh 

 pond and Massapekua pond. 



Thr supply from the original catchment is collected by a brick 

 conduit, extending from Hempstead pond westerly to the old 

 Ridgewood station, and having a grade of about six inches to 

 the mile. 



On the new catchment the supply is collected and carried 

 by gravity to the Millburn station through a brick conduit, seven 

 and one-quarter miles long, and having a grade of one in ten 

 thousand. The two driven-well stations on this catchment are 

 located south of the conduit and discharge into it through cast- 

 iron pipes. Xew stations will be similarly connected. 



In order to show the possibilities of a supply from the sand 

 areas of Long Island, the following may be considered: 



Water yield of the Long Island sand areas. Long Island is 

 about 120 miles in length, with a varying width of from 10 to 

 20 miles. Its watershed line consists of a ridge of low hills 

 running from Xew York bay to the eastern extremity of the 



