San Francisco Peninsula reservoir system
E126933
The San Francisco Peninsula reservoir system is a network of man-made lakes and related infrastructure that stores and supplies drinking water to the San Francisco Bay Area, particularly the city of San Francisco and nearby communities.
All labels observed (6)
How this entity was disambiguated
This entity first appeared as the object of triple T1109416 — 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: San Francisco Peninsula reservoir system Context triple: [San Andreas Lake, partOf, San Francisco Peninsula reservoir system]
-
A.
Shasta Dam
Shasta Dam is a large concrete gravity dam on California’s Sacramento River, forming Shasta Lake and serving as a key source of water storage, hydroelectric power, and flood control for the state.
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B.
Hollywood Reservoir
Hollywood Reservoir is a man-made lake in the Hollywood Hills of Los Angeles, known for its scenic walking paths and iconic views of the Hollywood Sign.
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C.
New Melones Dam
New Melones Dam is a large multipurpose reservoir and hydroelectric facility on the Stanislaus River in California, providing water storage, flood control, and power generation.
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D.
Perris Dam
Perris Dam is a large earthfill embankment dam in Riverside County, California, that forms Lake Perris as part of the state’s major water storage and distribution system.
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E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- 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: San Francisco Peninsula reservoir system Target entity description: The San Francisco Peninsula reservoir system is a network of man-made lakes and related infrastructure that stores and supplies drinking water to the San Francisco Bay Area, particularly the city of San Francisco and nearby communities.
-
A.
Shasta Dam
Shasta Dam is a large concrete gravity dam on California’s Sacramento River, forming Shasta Lake and serving as a key source of water storage, hydroelectric power, and flood control for the state.
-
B.
Hollywood Reservoir
Hollywood Reservoir is a man-made lake in the Hollywood Hills of Los Angeles, known for its scenic walking paths and iconic views of the Hollywood Sign.
-
C.
New Melones Dam
New Melones Dam is a large multipurpose reservoir and hydroelectric facility on the Stanislaus River in California, providing water storage, flood control, and power generation.
-
D.
Perris Dam
Perris Dam is a large earthfill embankment dam in Riverside County, California, that forms Lake Perris as part of the state’s major water storage and distribution system.
-
E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
reservoir system
ⓘ
water supply system ⓘ |
| connectedTo |
Bay Division Pipelines
ⓘ
Hetch Hetchy Regional Water System ⓘ
surface form:
Hetch Hetchy aqueduct
|
| country |
United States of America
ⓘ
surface form:
United States
|
| environmentalImpact |
creation of artificial lakes
ⓘ
modification of local riparian habitats ⓘ |
| hasPart |
Calaveras Reservoir
ⓘ
Crystal Springs Reservoir ⓘ Crystal Springs Reservoir ⓘ
surface form:
Lower Crystal Springs Reservoir
Pilarcitos Lake ⓘ Pilarcitos Reservoir ⓘ San Andreas Lake ⓘ San Antonio Reservoir ⓘ Crystal Springs Reservoir ⓘ
surface form:
Upper Crystal Springs Reservoir
local distribution pipelines ⓘ pumping stations ⓘ water treatment facilities ⓘ |
| infrastructureType | man-made lakes and related infrastructure ⓘ |
| locatedIn |
San Francisco Bay Area
ⓘ
San Francisco Peninsula ⓘ |
| locatedOn |
San Andreas Rift Valley
ⓘ
surface form:
San Andreas Rift Zone
|
| manages | reservoir water levels ⓘ |
| operator | San Francisco Public Utilities Commission ⓘ |
| ownedBy | San Francisco Public Utilities Commission ⓘ |
| partOf | Hetch Hetchy Regional Water System ⓘ |
| purpose |
ensure reliable water supply for the San Francisco Bay Area
ⓘ
provide treated potable water ⓘ |
| regulates |
regional water storage
ⓘ
seasonal runoff ⓘ |
| serves |
San Francisco County
ⓘ
surface form:
City and County of San Francisco
San Mateo County communities ⓘ Santa Clara County communities ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| subjectTo |
California water quality regulations
ⓘ
seismic safety standards ⓘ |
| suppliesTo |
Burlingame
ⓘ
Daly City ⓘ San Francisco ⓘ South San Francisco ⓘ other Peninsula cities ⓘ |
| use |
drinking water supply
ⓘ
emergency water storage ⓘ municipal water supply ⓘ |
| waterSource |
Hetch Hetchy aqueduct deliveries
ⓘ
local watershed runoff ⓘ |
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: San Francisco Peninsula reservoir system Description of subject: The San Francisco Peninsula reservoir system is a network of man-made lakes and related infrastructure that stores and supplies drinking water to the San Francisco Bay Area, particularly the city of San Francisco and nearby communities.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Hetch Hetchy Regional Water System
this entity surface form:
San Francisco Peninsula watershed
this entity surface form:
Tuolumne River water supply system
this entity surface form:
San Francisco Peninsula water supply system
this entity surface form:
San Francisco water supply system