A tourist in New York City with photo camera. Water tanks, roofs,
Imagen
 típica de Nueva York son los tanques de agua en muchos tejados. En este
 caso algunos de los que se ven en el recorrido desde el Flatiron hasta 
High Lane
A water tower
 is an elevated structure supporting a water tank constructed at a 
height sufficient to pressurize a water supply system for the 
distribution of potable water, and to provide emergency storage for fire
 protection. In some places, the term standpipe is used interchangeably to refer to a water tower, especially one with tall and narrow proportions.
 Water towers often operate in conjunction with underground or surface 
service reservoirs, which store treated water close to where it will be 
used.[ Other types of water towers may only store raw (non-potable) water for 
fire protection or industrial purposes, and may not necessarily be 
connected to a public water supply.
Water towers are able to supply water even during power outages, because
 they rely on hydrostatic pressure produced by elevation of water (due 
to gravity)
 to push the water into domestic and industrial water distribution 
systems; however, they cannot supply the water for a long time without 
power,
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Recuerde que haciendo click en la foto se ve a mayor tamaño