Martinez Reservoir
E315645
Martinez Reservoir is a man-made water storage facility in Contra Costa County, California, used for municipal and irrigation supply as part of the region’s canal and water management system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Martinez Reservoir canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2907455 — 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: Martinez Reservoir Context triple: [Contra Costa Canal, hasComponent, Martinez Reservoir]
-
A.
La Paloma Reservoir
La Paloma Reservoir is a major artificial lake in Chile’s Coquimbo Region, known for supporting irrigation and water supply in the Monte Patria area.
-
B.
Don Pedro Reservoir
Don Pedro Reservoir is a large artificial lake in California’s Sierra Nevada foothills, primarily used for water storage, hydroelectric power generation, and recreation.
-
C.
El Pardo Reservoir
El Pardo Reservoir is a dammed water body near Madrid, Spain, primarily used for water supply, flood control, and recreation along the Manzanares River.
-
D.
San Luis Reservoir
San Luis Reservoir is a large artificial lake in California that serves as a major water storage facility for irrigation and municipal use in the state’s Central Valley.
-
E.
Crystal Springs Reservoir
Crystal Springs Reservoir is a large artificial lake system on the San Francisco Peninsula that serves as a major drinking water source and scenic open-space area for the 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: Martinez Reservoir Target entity description: Martinez Reservoir is a man-made water storage facility in Contra Costa County, California, used for municipal and irrigation supply as part of the region’s canal and water management system.
-
A.
La Paloma Reservoir
La Paloma Reservoir is a major artificial lake in Chile’s Coquimbo Region, known for supporting irrigation and water supply in the Monte Patria area.
-
B.
Don Pedro Reservoir
Don Pedro Reservoir is a large artificial lake in California’s Sierra Nevada foothills, primarily used for water storage, hydroelectric power generation, and recreation.
-
C.
El Pardo Reservoir
El Pardo Reservoir is a dammed water body near Madrid, Spain, primarily used for water supply, flood control, and recreation along the Manzanares River.
-
D.
San Luis Reservoir
San Luis Reservoir is a large artificial lake in California that serves as a major water storage facility for irrigation and municipal use in the state’s Central Valley.
-
E.
Crystal Springs Reservoir
Crystal Springs Reservoir is a large artificial lake system on the San Francisco Peninsula that serves as a major drinking water source and scenic open-space area for the region.
- F. None of above. chosen
Statements (28)
| Predicate | Object |
|---|---|
| instanceOf |
man-made lake
ⓘ
reservoir ⓘ |
| basinCountry |
United States of America
ⓘ
surface form:
United States
|
| category |
Reservoirs in Contra Costa County, California
ⓘ
Water supply infrastructure in California ⓘ |
| continent | North America ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| hasInfrastructureRole |
irrigation infrastructure
ⓘ
local water supply infrastructure ⓘ |
| hasType | surface water reservoir ⓘ |
| isArtificial | true ⓘ |
| isImpoundedBy | a dam or embankment structure ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Contra Costa County ⓘ
surface form:
Contra Costa County, California
San Francisco Bay Area ⓘ |
| locatedInTimeZone | Pacific Time Zone ⓘ |
| locatedNear |
Martinez, California
ⓘ
surface form:
City of Martinez, California
|
| partOf | regional canal and water management system in Contra Costa County ⓘ |
| region | West Coast of the United States ⓘ |
| serves |
agricultural irrigation users in Contra Costa County
ⓘ
municipal customers in Contra Costa County ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| use |
irrigation water supply
ⓘ
municipal water supply ⓘ |
| waterManagementFunction |
flow regulation
ⓘ
supply reliability ⓘ water storage ⓘ |
| waterSourceType | surface water ⓘ |
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: Martinez Reservoir Description of subject: Martinez Reservoir is a man-made water storage facility in Contra Costa County, California, used for municipal and irrigation supply as part of the region’s canal and water management system.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.