488 WATER SUPPLY AND SEWAGE DISPOSAL 



duct to bring the rainfall of that region to the city (Fig. 

 299). The new aqueduct is 127 miles in length. The 

 water is carried through a tunnel over 4 miles in length and 

 at a depth of 1100 ft. beneath the Hudson River and later 

 through another tunnel at the depth of 700 ft. beneath the 

 East River. It is estimated that the new system will cost 

 $200,000,000 and that it will double the city's water supply, 

 making the supply 1,000,000,000 gal. per day. This will be 

 an ample supply for a city of 8,000,000 population, allowing 

 125 gal. a day per capita. Every effort is being made to 

 safeguard the purity of the water from the new source. To 

 do this, seven villages in the Catskills have been abandoned. 

 At the completion of the Catskill development the city will 

 have expended nearly $100 per capita for its water supply. 



570. Water Supply of Los Angeles, California. The city of 

 Los Angeles, Cal., is likewise at the present time constructing 

 an aqueduct 246 miles in length to conduct its water supply 

 from the Sierra Nevada Mountains to the city. The water 

 has to be carried over mountains, across canyons, and for 

 18 miles through tunnels in the solid rock. This aqueduct 

 will cost nearly $25,000,000, or about $160 per capita, and is 

 designed to supply 300,000,000 gal. daily or an ample supply 

 for a future population of 2,000,000 people, allowing 150 gal. 

 daily per capita. Coming as it does from a high elevation 

 above the city, it will be under high pressure, and may, there- 

 fore, be used for power purposes. It is expected to produce 

 150,000 horsepower of electrical energy which may be sold and 

 used for various purposes. This will be one of the largest 

 water power plants in the United States, being exceeded only 

 by the Niagara and Keokuk plants (see Art. 668, page 560). 



671. City Supply from Deep Wells. Many of our smaller 

 cities are able to obtain a sufficient supply of water from deep 

 wells. Many of the cities of southern Wisconsin and north- 

 ern Illinois, for example, obtain their water from a layer of 

 sandstone which comes to the surface in northern Wisconsin 

 but which is generally reached at a depth of 1000 ft. or more 



