Greater Los Angeles hydrologic system
E369395
The Greater Los Angeles hydrologic system is the interconnected network of rivers, arroyos, watersheds, and engineered water infrastructure that manages surface and groundwater flow across the Los Angeles metropolitan region.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Greater Los Angeles hydrologic system canonical | 1 |
| Los Angeles County flood control system | 1 |
| Los Angeles municipal water system expansion | 1 |
| Los Angeles water supply network | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3565645 — 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: Greater Los Angeles hydrologic system Context triple: [Arroyo Seco, partOf, Greater Los Angeles hydrologic system]
-
A.
Los Angeles River
The Los Angeles River is a largely channelized urban waterway running through Los Angeles County that has played a central role in the region’s history, development, and ongoing revitalization efforts.
-
B.
Santa Clara River watershed
The Santa Clara River watershed is a major river basin in Southern California that drains diverse mountain and valley landscapes before emptying into the Pacific Ocean near Ventura.
-
C.
West Basin
West Basin is a western section of Canberra’s Lake Burley Griffin, known for its waterfront promenades, recreational spaces, and proximity to key civic and cultural precincts.
-
D.
Sacramento River Basin
The Sacramento River Basin is a major watershed in Northern California that drains the Sacramento River and its tributaries, supporting extensive agriculture, ecosystems, and water supply for the region.
-
E.
Ventura River watershed
The Ventura River watershed is a river basin in Ventura County, California, that collects runoff from surrounding mountain ranges and drains it through the Ventura River to the Pacific Ocean.
- 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: Greater Los Angeles hydrologic system Target entity description: The Greater Los Angeles hydrologic system is the interconnected network of rivers, arroyos, watersheds, and engineered water infrastructure that manages surface and groundwater flow across the Los Angeles metropolitan region.
-
A.
Los Angeles River
The Los Angeles River is a largely channelized urban waterway running through Los Angeles County that has played a central role in the region’s history, development, and ongoing revitalization efforts.
-
B.
Santa Clara River watershed
The Santa Clara River watershed is a major river basin in Southern California that drains diverse mountain and valley landscapes before emptying into the Pacific Ocean near Ventura.
-
C.
West Basin
West Basin is a western section of Canberra’s Lake Burley Griffin, known for its waterfront promenades, recreational spaces, and proximity to key civic and cultural precincts.
-
D.
Sacramento River Basin
The Sacramento River Basin is a major watershed in Northern California that drains the Sacramento River and its tributaries, supporting extensive agriculture, ecosystems, and water supply for the region.
-
E.
Ventura River watershed
The Ventura River watershed is a river basin in Ventura County, California, that collects runoff from surrounding mountain ranges and drains it through the Ventura River to the Pacific Ocean.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
hydrologic system
ⓘ
water management infrastructure network ⓘ |
| affectedBy |
Mediterranean climate with winter rainfall
ⓘ
urbanization and impervious surfaces ⓘ |
| country | United States of America ⓘ |
| drainsInto | Pacific Ocean ⓘ |
| drainsVia |
Los Angeles River mouth at Long Beach
ⓘ
San Gabriel River mouth at Seal Beach ⓘ Santa Ana River ⓘ
surface form:
Santa Ana River mouth at Huntington Beach
|
| hasCharacteristic |
concrete-lined river segments
ⓘ
flashy urban runoff response ⓘ highly engineered channels ⓘ |
| hasFunction |
ecosystem support
ⓘ
flood control ⓘ groundwater recharge ⓘ stormwater management ⓘ water quality protection ⓘ |
| includes |
Arroyo Seco
ⓘ
Ballona Creek ⓘ Dominguez Channel ⓘ Los Angeles River ⓘ Los Angeles River ⓘ
surface form:
Los Angeles River watershed
Malibu Creek ⓘ Rio Hondo ⓘ San Gabriel River ⓘ San Gabriel River ⓘ
surface form:
San Gabriel River watershed
Santa Ana River ⓘ Santa Ana River ⓘ
surface form:
Santa Ana River watershed
Santa Monica Bay ⓘ
surface form:
Santa Monica Bay coastal watersheds
debris basins ⓘ flood control channels ⓘ flood control dams ⓘ groundwater recharge basins ⓘ spreading grounds ⓘ storm drain networks ⓘ urban runoff conveyance systems ⓘ wastewater treatment plant outfalls ⓘ water supply aqueduct connections ⓘ |
| locatedIn |
Greater Los Angeles Area
ⓘ
surface form:
Los Angeles metropolitan area
Southern California ⓘ |
| manages |
groundwater flow
ⓘ
surface water flow ⓘ |
| operatedBy |
Los Angeles County Flood Control District
ⓘ
Los Angeles Department of Water and Power ⓘ Metropolitan Water District of Southern California ⓘ Orange County Flood Control District ⓘ |
| partOf | Southern California coastal hydrologic region ⓘ |
| regulatedBy |
California State Water Resources Control Board
ⓘ
Los Angeles Regional Water Quality Control Board ⓘ U.S. Army Corps of Engineers ⓘ
surface form:
United States Army Corps of Engineers
|
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: Greater Los Angeles hydrologic system Description of subject: The Greater Los Angeles hydrologic system is the interconnected network of rivers, arroyos, watersheds, and engineered water infrastructure that manages surface and groundwater flow across the Los Angeles metropolitan region.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Los Angeles water supply network
this entity surface form:
Los Angeles municipal water system expansion
this entity surface form:
Los Angeles County flood control system