   thumb|building in yonkers the delaware aqueduct is the newest of the new york city aqueducts. it takes water from the rondout reservoir through the chelsea pump station, the west branch reservoir, and the kensico reservoir, ending at the hillview reservoir in yonkers, new york. the aqueduct was constructed between 1939 and 1945, and carries approximately half of the new york city water supply of  per day. the delaware aqueduct leaks up to  per day. a $1 billion project to repair the leaking is scheduled to begin in january 2013.  at  long and  wide, the delaware aqueduct is the world's longest tunnel. ==leaks== since the late 1970s, the new york city department of environmental protection (nycdep) has been monitoring two leaks in the delaware aqueduct that collectively release between  of water per day. these leaks have caused many problems with flooding and drinking water contamination, particularly for residents of wawarsing, new york.{{cite press release |publisher=congressman maurice hinchey |date=july 11, 2008 |title=hinchey urges new york city dept. of environmental protection to comprehensively address the impact of leaking delaware aqueduct on wawarsing |url=http://hinchey.house.gov/index.php?option=com_content&view=article&id=1059%3ahinchey-urges-new-york-city-dept-of-environmental-protection-to-comprehensively-address-the-impact-of-leaking-delaware-aqueduct-on-wawarsing-urges-agency-to-cover-all-related-expenses-incurred-by-residents&catid=34%3a2008-press-releases&itemid=1 |accessdate=oct
Aqueducts_in_the_United_States Buildings_and_structures_in_Putnam_County,_New_York Buildings_and_structures_in_Ulster_County,_New_York Buildings_and_structures_in_Westchester_County,_New_York Interbasin_transfer Landmarks_in_New_York Water_infrastructure_of_New_York_City