The construction of vaal dam started during the depression of the early thirties and the dam was completed in 1938 with a wall height of 54. If the vaal dam system drops below 20% the tale out pumping points will be compromised, joburg water has warned. A complete guide to the freshwater fishes of southern africa. Infiltration of water also increased due to the wider river. The major dams in the vaal river catchment are given in table 1. Department of water and sanitation spokesperson sputnik ratau said for weeks the levels of the dam had been dropping, to such an extent that last week it reached 39. Vaal dam and vaal barrage 30day moving daily summary for 2020. Vaal dam is located in quaternary catchment c12l and c83m in the middle vaal water management area in south africa. The orangevaal system is an extremely important water source and con. It has over 800 kilometres 500 mi of shoreline and is south africas second biggest dam by area and the fourth largest by volume. The area supplied from the vaal river system, generates more than 50% of south africas gross geographical product ggp, more than 80% of the countrys electricity and includes some of the largest gold, platinum and coal mines in the. Vaal dam forms the central storage reservoir for the vaal river water supply system which supplies water to the industrial powerhouse of the whole country.
Hard water contains high levels of dissolved minerals, which can build up in water. The vaal dam, gautengs major water supplier, records. The effect of floods on the quality of the water using the vaal dam reservoir. When the vaal river barrage reservoir was built in 1923 the width of the river expanded roodt, 1982. The dam supplies water to about 46% of the countrys economy and 33% of the population and forms part of the integrated vaal river system ivrs. The vaal catchment can be divided into four zones on the basis of water quality problems ie the vaal dam, the barrage, the bloemhof and the douglas weir subcatchments. Yr detailed hourly forecast for vaal dam south africa.
The country is in dire need of rainfall, with at least some forecast over the next. Not all abstraction and evaporation losses from vaal dam are reflected on the above graph. The vaal dam in south africa is located 77 kilometers from johannesburg international airport and used to be south africas largest dam. On wednesday morning, johannesburg water tweeted, vaal dam is now sitting on 71. Fair, temperature 20, 0 mm, light breeze, 2 ms from south. This time last year, it was at around 74 percent full. Costs of eutrophication at the vaal river system semantic scholar. The dam would receive water from different catchment areas through various projects.
Description the vaal dam is a composite dam consisting of a concrete gravity wall 714 m long and a main earth embankment on the right bank which is 1 970 m long and connects directly with the concrete wall. The vaal river barrage, south africas hardest working water way. The dam is a concrete gravity structure with an earthfill section on the right flank. Johannesburg water has noted a huge increase in the vaal dam water level since tuesday night. Pdf the vaal river barrage, south africas hardest working water. The dam supplies around 12 million south africans, and as of wednesday, the water level was at only 33. Clear sky, temperature 14, 0 mm, light breeze, 2 ms from westnorthwest. Latest dam levels save watervaal dam dropping, now at. The effect of floods and high rainfall on the water quality in. The natural inflow to vaal dam is approximately 1 950 million m 3 a although the upstream grootdraai and sterkfontein dams reduce the resulting natural inflow to approximately 1 400 million m 3 a making the vaal dam a 1. Pdf monogenean parasites from fishes of the vaal dam, gauteng.
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