Vaal Dam remains over 100% full as inflows fluctuate
· Citizen
Weekly hydrological data showed the Vaal Dam holding above full capacity between 10 and 16 August 2026, while barrage discharge rose sharply towards the end of the week.
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Vaal Dam
Storage held above 100% all week. The dam sat at 100.63% on Monday, 101.00% on Tuesday, 101.64% on Wednesday, 101.89% on Thursday and 101.89% on Friday.
The weekly average was 101.41%, ranging between a low of 100.63% and a high of 101.89%.
Inflow varied considerably, from 40.8 m³/s on Monday, to 42.4 m³/s on Tuesday, 63.6 m³/s on Wednesday, 89.9 m³/s on Thursday, and 63.0 m³/s on Friday.
The weekly average was 59.9 m³/s.
Discharge from the dam was constant all week at 16.8 m³/s, and no sluice gates were opened on any of the five reported days.
Vaal Barrage
Barrage water levels were stable: 7.5 m on Monday, 7.5 m on Tuesday, 7.6 m on Wednesday, 7.4 m on Thursday, and 7.5 m on Friday, which was a weekly average of 7.5 m.
Barrage discharge climbed as the week progressed. On Monday, it recorded 30.0 m³/s; Tuesday, 29.9 m³/s; Wednesday, 44.9 m³/s; Thursday, 44.2 m³/s Thursday, and 59.7 m³/s Friday (the week’s high). The average was 41.7 m³/s.
Water temperature eased over the week. 12.7°C Monday, 10.7°C Tuesday, 10.3°C Wednesday, 10.6°C Thursday, and 11.5°C Friday, averaging 11.2°C.
Figures for Saturday 15 August and Sunday 16 August had not yet been recorded at the time of publication.