SUBTERRAlSrEAN ElVEE WALKER AND BOND. 



711 



to day, and the steady flow coming in from the aqueduct. Between 

 Hill View and the city the system consists of a deep circular, high- 

 pressure tunnel, through which the water will be led beneath Man- 

 hattan, to be distributed by surface mains throughout that city, and 

 also throughout the other districts of Greater New York. 



THE ASHOKAN RESERVOIR. 



The great Ashokan Reservoir is situated about 14 miles west of 

 Kingston, on the Hudson River. Its cost is $18,000,000, and it will 



GRADE TUNNEL 



PRESSURE TUNNEL 



hold sufficient water to cover the whole of Manhattan Island to a 

 depth of 28 feet. The water is impounded by the Olive Bridge Dam, 

 which is built across Esopus Creek, and also by the Beaver Kill and 

 the Hurley dikes, which have been built across streams and gaps 

 lying between the hills which surround the reservoir. By the 1st of 

 January, this year, 73 per cent of this work was done. The dam is 

 a masonry structure 190 feet in thickness at the base, and 23 feet 

 thick at the top. The surface of the water when the reservoir is 

 full is 590 feet above tide level. The total length of the main dam 



