Vyrnwy Dam
E951075
Vyrnwy Dam is a historic stone-built dam in Powys, Wales, notable for creating Lake Vyrnwy and being one of the first large masonry dams in the United Kingdom.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Lake Vyrnwy dam | 2 |
| Vyrnwy Dam canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11869166 — 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: Vyrnwy Dam Context triple: [Lake Vyrnwy, hasPart, Vyrnwy Dam]
-
A.
Lake Vyrnwy
Lake Vyrnwy is a large artificial reservoir in Powys, Wales, created in the 19th century to supply water to Liverpool and now known for its scenic surroundings and wildlife.
-
B.
Llyn Celyn
Llyn Celyn is a large reservoir in North Wales, created in the 1960s by flooding the Tryweryn Valley, including the village of Capel Celyn, to supply water to Liverpool.
-
C.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
D.
Claerwen Dam
Claerwen Dam is a large concrete gravity dam in mid-Wales, forming part of the Elan Valley reservoir system that supplies water to Birmingham.
-
E.
Garreg Ddu Reservoir
Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
- 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: Vyrnwy Dam Target entity description: Vyrnwy Dam is a historic stone-built dam in Powys, Wales, notable for creating Lake Vyrnwy and being one of the first large masonry dams in the United Kingdom.
-
A.
Lake Vyrnwy
Lake Vyrnwy is a large artificial reservoir in Powys, Wales, created in the 19th century to supply water to Liverpool and now known for its scenic surroundings and wildlife.
-
B.
Llyn Celyn
Llyn Celyn is a large reservoir in North Wales, created in the 1960s by flooding the Tryweryn Valley, including the village of Capel Celyn, to supply water to Liverpool.
-
C.
Clywedog Reservoir
Clywedog Reservoir is a large man-made lake in mid-Wales, created for water regulation and recreation amid scenic upland surroundings.
-
D.
Claerwen Dam
Claerwen Dam is a large concrete gravity dam in mid-Wales, forming part of the Elan Valley reservoir system that supplies water to Birmingham.
-
E.
Garreg Ddu Reservoir
Garreg Ddu Reservoir is a scenic man-made lake in the Elan Valley of mid-Wales, known for its distinctive submerged dam and role in supplying water to the city of Birmingham.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
gravity dam
ⓘ
masonry dam ⓘ reservoir dam ⓘ |
| architecturalStyle | Victorian engineering ⓘ |
| basinCountry |
United Kingdom
ⓘ
Wales NERFINISHED ⓘ |
| constructionType | solid masonry gravity structure ⓘ |
| country | United Kingdom ⓘ |
| countryOfJurisdiction | Wales NERFINISHED ⓘ |
| createsReservoir | Lake Vyrnwy NERFINISHED ⓘ |
| hasAccess | public road across crest ⓘ |
| hasFunction | impounding reservoir ⓘ |
| hasPart |
buttresses
ⓘ
central spillway ⓘ roadway on crest ⓘ series of arches ⓘ valve tower ⓘ |
| hasRecreationalUse |
scenic tourism
ⓘ
walking and cycling around reservoir ⓘ |
| hasTouristAttraction | viewpoints over Lake Vyrnwy ⓘ |
| heritageStatus | historic structure ⓘ |
| isPartOf | United Kingdom water infrastructure ⓘ |
| locatedIn |
Lake Vyrnwy estate
NERFINISHED
ⓘ
Powys NERFINISHED ⓘ Wales ⓘ |
| locatedInProtectedArea | Lake Vyrnwy RSPB reserve NERFINISHED ⓘ |
| locatedNear | Llanwddyn NERFINISHED ⓘ |
| locatedOnWatercourse | River Vyrnwy NERFINISHED ⓘ |
| materialUsed |
masonry
ⓘ
stone ⓘ |
| nearbyFeature | Lake Vyrnwy straining tower NERFINISHED ⓘ |
| nearbySettlementFloodedForConstruction | old village of Llanwddyn ⓘ |
| notableFor |
being one of the first large masonry dams in the United Kingdom
ⓘ
ornamental architectural detailing ⓘ stone-built construction ⓘ |
| operator | Severn Trent Water NERFINISHED ⓘ |
| ownedBy | Severn Trent Water NERFINISHED ⓘ |
| partOf | Lake Vyrnwy water supply scheme NERFINISHED ⓘ |
| purpose |
regulation of river flow
ⓘ
water supply ⓘ |
| region | Mid Wales NERFINISHED ⓘ |
| significantEvent | creation of Lake Vyrnwy ⓘ |
| usedFor |
hydroelectric power (small-scale)
ⓘ
public water supply to Liverpool region ⓘ |
| watercourseDownstream | River Vyrnwy NERFINISHED ⓘ |
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: Vyrnwy Dam Description of subject: Vyrnwy Dam is a historic stone-built dam in Powys, Wales, notable for creating Lake Vyrnwy and being one of the first large masonry dams in the United Kingdom.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Lake Vyrnwy dam
this entity surface form:
Lake Vyrnwy dam