United States Geological Survey hydrologic unit codes
E242036
United States Geological Survey hydrologic unit codes are a standardized numerical system used to uniquely identify and organize the nation’s watersheds and drainage basins for hydrologic mapping and analysis.
All labels observed (4)
| Label | Occurrences |
|---|---|
| National Watershed Boundary Dataset | 1 |
| USGS HUC system | 1 |
| USGS hydrologic unit codes | 1 |
| United States Geological Survey hydrologic unit codes canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2201217 — 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.
Target entity: United States Geological Survey hydrologic unit codes Context triple: [Mississippi River basin, hydrologicCodeSystem, United States Geological Survey hydrologic unit codes]
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A.
National Water Information System
The National Water Information System is a comprehensive U.S. database and platform that provides access to nationwide water resources data, including streamflow, groundwater levels, water quality, and water use.
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B.
Adirondack Park hydrological network
The Adirondack Park hydrological network is the interconnected system of rivers, streams, lakes, and wetlands that drains and shapes New York’s Adirondack Park ecosystem.
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C.
Natural Resources Conservation Service
The Natural Resources Conservation Service is a U.S. federal agency that provides technical and financial assistance to farmers, ranchers, and landowners to conserve soil, water, and other natural resources on private lands.
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D.
La Mesa Watershed
La Mesa Watershed is a protected forest and reservoir area in Quezon City that serves as a major source of drinking water and a key urban green space for Metro Manila.
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E.
Murray Irrigation Area
The Murray Irrigation Area is a major agricultural irrigation district in the Riverina region of New South Wales, Australia, known for its extensive network of channels supplying water to broadacre farms.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: United States Geological Survey hydrologic unit codes Target entity description: United States Geological Survey hydrologic unit codes are a standardized numerical system used to uniquely identify and organize the nation’s watersheds and drainage basins for hydrologic mapping and analysis.
-
A.
National Water Information System
The National Water Information System is a comprehensive U.S. database and platform that provides access to nationwide water resources data, including streamflow, groundwater levels, water quality, and water use.
-
B.
Adirondack Park hydrological network
The Adirondack Park hydrological network is the interconnected system of rivers, streams, lakes, and wetlands that drains and shapes New York’s Adirondack Park ecosystem.
-
C.
Natural Resources Conservation Service
The Natural Resources Conservation Service is a U.S. federal agency that provides technical and financial assistance to farmers, ranchers, and landowners to conserve soil, water, and other natural resources on private lands.
-
D.
La Mesa Watershed
La Mesa Watershed is a protected forest and reservoir area in Quezon City that serves as a major source of drinking water and a key urban green space for Metro Manila.
-
E.
Murray Irrigation Area
The Murray Irrigation Area is a major agricultural irrigation district in the Riverina region of New South Wales, Australia, known for its extensive network of channels supplying water to broadacre farms.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
geospatial identifier system
ⓘ
hydrologic classification system ⓘ watershed coding system ⓘ |
| alsoKnownAs |
HUC codes
ⓘ
United States Geological Survey hydrologic unit codes ⓘ
surface form:
USGS hydrologic unit codes
hydrologic unit codes ⓘ |
| appliesTo |
drainage basins
ⓘ
subwatersheds ⓘ surface water drainage areas ⓘ watersheds ⓘ |
| codeLengthAtLevel |
10-digit watershed code
ⓘ
12-digit subwatershed code ⓘ 2-digit region code ⓘ 4-digit subregion code ⓘ 6-digit accounting unit code ⓘ 8-digit cataloging unit code ⓘ |
| countryOfUse |
United States of America
ⓘ
surface form:
United States
|
| developedBy | United States Geological Survey ⓘ |
| governedBy | USGS hydrologic unit system guidelines ⓘ |
| hasProperty |
fixed-length numeric codes
ⓘ
nationwide coverage ⓘ nested structure ⓘ unique numeric identifiers ⓘ |
| maximumCodeLength | 12 digits ⓘ |
| minimumCodeLength | 2 digits ⓘ |
| organizedAs | hierarchical system ⓘ |
| partOf | National Hydrography Dataset ⓘ |
| relatedTo |
United States Geological Survey hydrologic unit codes
self-linksurface differs
ⓘ
surface form:
National Watershed Boundary Dataset
watershed boundaries dataset ⓘ |
| standardizedBy | United States Geological Survey ⓘ |
| standardType | federal hydrologic unit standard ⓘ |
| topLevelUnit | region ⓘ |
| topLevelUnitCount | 21 hydrologic regions ⓘ |
| usedBy |
GIS professionals
ⓘ
environmental scientists ⓘ federal agencies ⓘ local governments ⓘ state agencies ⓘ water resource managers ⓘ |
| usedFor |
environmental planning
ⓘ
flood risk assessment ⓘ hydrologic data organization ⓘ hydrologic mapping ⓘ identification of drainage basins ⓘ identification of watersheds ⓘ water quality assessment ⓘ water resources analysis ⓘ watershed management ⓘ |
| usedIn |
geographic information systems
ⓘ
hydrologic modeling ⓘ national water data systems ⓘ |
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.
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.
Subject: United States Geological Survey hydrologic unit codes Description of subject: United States Geological Survey hydrologic unit codes are a standardized numerical system used to uniquely identify and organize the nation’s watersheds and drainage basins for hydrologic mapping and analysis.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.