Vaal Dam
E336615
Vaal Dam is a major reservoir in South Africa that supplies water to the Gauteng region and plays a key role in the country’s water management and power generation systems.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Vaal Dam canonical | 1 |
| Vaal Dam wall | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3190505 — 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: Vaal Dam Context triple: [Vaal River, hasDam, Vaal Dam]
-
A.
Gariep Dam
Gariep Dam is South Africa’s largest storage reservoir, situated on the Orange River and serving as a key source of water, hydroelectric power, and recreation for the surrounding regions.
-
B.
Hartbeespoort Dam
Hartbeespoort Dam is a large, popular recreational and irrigation reservoir in South Africa’s North West Province, known for its scenic setting and proximity to Pretoria and Johannesburg.
-
C.
Gaborone Dam
Gaborone Dam is a major reservoir near Gaborone, Botswana, serving as a key water supply source and popular recreation area for the region.
-
D.
Vanderkloof Dam
Vanderkloof Dam is a major hydroelectric and irrigation dam in South Africa, located on the Orange River and forming one of the country’s largest reservoirs.
-
E.
Roseires Dam
Roseires Dam is a major hydroelectric and irrigation dam on the Blue Nile in Sudan, crucial for water storage, power generation, and flood control in 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: Vaal Dam Target entity description: Vaal Dam is a major reservoir in South Africa that supplies water to the Gauteng region and plays a key role in the country’s water management and power generation systems.
-
A.
Gariep Dam
Gariep Dam is South Africa’s largest storage reservoir, situated on the Orange River and serving as a key source of water, hydroelectric power, and recreation for the surrounding regions.
-
B.
Hartbeespoort Dam
Hartbeespoort Dam is a large, popular recreational and irrigation reservoir in South Africa’s North West Province, known for its scenic setting and proximity to Pretoria and Johannesburg.
-
C.
Gaborone Dam
Gaborone Dam is a major reservoir near Gaborone, Botswana, serving as a key water supply source and popular recreation area for the region.
-
D.
Vanderkloof Dam
Vanderkloof Dam is a major hydroelectric and irrigation dam in South Africa, located on the Orange River and forming one of the country’s largest reservoirs.
-
E.
Roseires Dam
Roseires Dam is a major hydroelectric and irrigation dam on the Blue Nile in Sudan, crucial for water storage, power generation, and flood control in the region.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
dam
ⓘ
reservoir ⓘ |
| basinCountry | South Africa ⓘ |
| catchmentArea | Vaal River catchment ⓘ |
| constructionStartDate | 1934 ⓘ |
| country | South Africa ⓘ |
| damType | concrete gravity dam ⓘ |
| expanded | 1950s ⓘ |
| hasFeature |
Vaal Dam
self-linksurface differs
ⓘ
surface form:
Vaal Dam wall
sluice gates ⓘ spillway ⓘ |
| locatedIn |
Free State
ⓘ
Gauteng ⓘ |
| locatedOnRiver | Vaal River ⓘ |
| managedBy |
Department of Water and Sanitation (South Africa)
ⓘ
surface form:
Department of Water and Sanitation of South Africa
|
| near |
Deneysville
ⓘ
Vaal Marina ⓘ Vereeniging ⓘ Villiers ⓘ |
| notableEvent |
Vaal Dam 2010–2011 flood releases
ⓘ
Vaal Dam 2016–2017 drought-related low levels ⓘ |
| openingDate | 1938 ⓘ |
| operator |
Department of Water and Sanitation (South Africa)
ⓘ
surface form:
Department of Water and Sanitation of South Africa
|
| partOf |
Integrated Vaal River System
ⓘ
Upper Vaal Water Management Area ⓘ
surface form:
Vaal River water management system
|
| primaryUse |
flood control
ⓘ
industrial water supply ⓘ irrigation ⓘ municipal water supply ⓘ recreation ⓘ |
| regionServed |
Free State
ⓘ
Gauteng ⓘ Mpumalanga ⓘ North West Province ⓘ |
| reservoirCapacity |
approximately 2 600 000 000 cubic metres
ⓘ
approximately 2.6 cubic kilometres ⓘ |
| shoreLength | approximately 800 kilometres ⓘ |
| suppliesWaterTo |
Ekurhuleni
ⓘ
Gauteng ⓘ Johannesburg, South Africa ⓘ
surface form:
Johannesburg
Pretoria, South Africa ⓘ
surface form:
Pretoria
Sasolburg ⓘ Vereeniging ⓘ |
| supports | hydroelectric power generation ⓘ |
| surfaceArea | approximately 320 square kilometres ⓘ |
| usedFor |
fishing
ⓘ
powerboating ⓘ watersports ⓘ yachting ⓘ |
| waterSourceFor | Rand 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: Vaal Dam Description of subject: Vaal Dam is a major reservoir in South Africa that supplies water to the Gauteng region and plays a key role in the country’s water management and power generation systems.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Vaal Dam wall