City Tunnel No. 3
E309799
City Tunnel No. 3 is a major New York City water supply tunnel that conveys drinking water from upstate reservoirs to the city’s distribution system.
All labels observed (2)
| Label | Occurrences |
|---|---|
| City Tunnel No. 3 canonical | 2 |
| Third Water Tunnel | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2874438 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: City Tunnel No. 3 Context triple: [Hillview Reservoir, connectedTo, City Tunnel No. 3]
-
A.
City Tunnel No. 1
City Tunnel No. 1 is a major New York City water supply tunnel that conveys drinking water from upstate reservoirs into the city’s distribution system.
-
B.
Prudential Tunnel
Prudential Tunnel is a vehicular tunnel in Boston, Massachusetts, that carries traffic beneath the Prudential Center complex as part of the Massachusetts Turnpike.
-
C.
Kingsway Tunnel
The Kingsway Tunnel is a major road tunnel under the River Mersey in northwest England, carrying vehicular traffic between Liverpool and the Wirral peninsula.
-
D.
Montague Street Tunnel
The Montague Street Tunnel is a New York City Subway tunnel under the East River that carries trains between Manhattan and Brooklyn.
-
E.
Downtown Tunnel
The Downtown Tunnel is a major underwater vehicular tunnel in the Hampton Roads region that carries traffic beneath the Elizabeth River between Norfolk and Portsmouth, Virginia.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: City Tunnel No. 3 Target entity description: City Tunnel No. 3 is a major New York City water supply tunnel that conveys drinking water from upstate reservoirs to the city’s distribution system.
-
A.
City Tunnel No. 1
City Tunnel No. 1 is a major New York City water supply tunnel that conveys drinking water from upstate reservoirs into the city’s distribution system.
-
B.
Prudential Tunnel
Prudential Tunnel is a vehicular tunnel in Boston, Massachusetts, that carries traffic beneath the Prudential Center complex as part of the Massachusetts Turnpike.
-
C.
Kingsway Tunnel
The Kingsway Tunnel is a major road tunnel under the River Mersey in northwest England, carrying vehicular traffic between Liverpool and the Wirral peninsula.
-
D.
Montague Street Tunnel
The Montague Street Tunnel is a New York City Subway tunnel under the East River that carries trains between Manhattan and Brooklyn.
-
E.
Downtown Tunnel
The Downtown Tunnel is a major underwater vehicular tunnel in the Hampton Roads region that carries traffic beneath the Elizabeth River between Norfolk and Portsmouth, Virginia.
- F. None of above. chosen
Statements (35)
| Predicate | Object |
|---|---|
| instanceOf |
New York City water infrastructure
ⓘ
civil engineering project ⓘ water supply tunnel ⓘ |
| alsoKnownAs |
City Tunnel No. 3
ⓘ
surface form:
Third Water Tunnel
|
| builtBy | contractors for New York City Department of Environmental Protection ⓘ |
| connectedTo | New York City water mains ⓘ |
| constructionStart | 1970 ⓘ |
| conveys | drinking water ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| designedFor | municipal water distribution ⓘ |
| engineeringDiscipline |
hydraulic engineering
ⓘ
tunnel engineering ⓘ |
| function | convey water from upstate reservoirs to city distribution system ⓘ |
| infrastructureType | underground tunnel ⓘ |
| locatedIn |
New York City
ⓘ
New York State ⓘ |
| materialTransported | potable water ⓘ |
| notableFor | being one of the largest capital projects in New York City history ⓘ |
| operator | New York City Department of Environmental Protection ⓘ |
| owner | New York City Department of Environmental Protection ⓘ |
| partOf | New York City water supply system ⓘ |
| passesUnder |
borough of Brooklyn
ⓘ
borough of Manhattan ⓘ borough of Queens ⓘ borough of the Bronx ⓘ |
| purpose |
increase reliability of New York City water supply
ⓘ
provide redundancy to existing City Tunnel No. 1 and City Tunnel No. 2 ⓘ |
| regionServed | New York City ⓘ |
| safetyRole | provide backup in case of failure of older tunnels ⓘ |
| sector | public utilities ⓘ |
| serviceType | drinking water supply ⓘ |
| source | upstate New York reservoirs ⓘ |
| status |
in long-term construction
ⓘ
partially completed ⓘ |
| supplies | New York City water distribution system ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: City Tunnel No. 3 Description of subject: City Tunnel No. 3 is a major New York City water supply tunnel that conveys drinking water from upstate reservoirs to the city’s distribution system.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Third Water Tunnel