14 NEW YORK STATE MUSEUM 



to Hill View reservoir on the northern limits of Xew York cit>' 

 and of the storage reserv^oirs and filtration work. Merritt H. Smith, 

 and more recently F. E. W'insor, department engineer. 



5 Long Island department. In charge of the development of the 

 underground water supply of Long Island. A plan looking toward 

 this end has been prepared and approved by the city authorities anc 

 is now being reviewed by the State Water Supply Commission. 



6 City aqueduct division. In charge of the delivery of water 

 from Hill Mew reservoir throughout Greater Xew York. Origi- 

 nally in charge of W. W. Brush, now under Walter E. Spear, as 

 department engineer. 



Departments are further divided into " divisions " each in charge 

 of a division engineer and a full corps of assistants. The subdi- 

 visions of these larger units, although primarily based upon con- 

 venience and efficiency of engineering supen'ision, coincides rather 

 closely with the larger geologic problems included in this bulletin. 



Generalities of construction 



The chief types of structure projected include (i} masonry- dams, 

 (2) earth dikes with core waUs, (3) "cut and cover" aqueduct 

 through countr}' of about the elevation of hydraulic grade. (4) 

 tunnels through mountains or ridges that are too high, and (5) 

 pressure tunnels under valleys or gorges that are too low. 



Some of these are of record proportions. For some of the de- 

 tails and figures see the different special problems in part 2. 



x\ll items complete as planned involve a total of: 



10 dams 



10 impoundmg, storage and distributing reservoirs 



4.5 miles of dikes 



54.5 miles of "cut and cover" aqueduct 

 13.9 miles of tunnel at grade 

 17.3 miles of pressure tunnel below grade 

 34 shafts of aggregate depth of 14.723 feet. 



6.3 miles of steel pipes making 



92.5 miles of aqueduct complete to Hill Mew equalizing 

 reservoir 



I filtration works 

 18.0 miles of delivers* tunnel in New York city to the termina" 



shafts in Brooklyn 

 16.3 miles of delivery pipe lines 



