Civil Engineer in South Africa - Volume 27, Issue 1, 1985
Volume 27, Issue 1, 1985
The role of the Rand Water Board during the critical 1983/84 drought period : emergency water suppliesAuthor L.D. HobbsSource: Civil Engineer in South Africa 27, pp 7 –12 (1985)More Less
The paper describes briefly the management policies and the procedures followed by the Rand Water Board in co-ordinating the water saving effort of the municipal and other public authorities to whom it supplies water, and over whom it has no authority, during the severe 1983/84 drought period. Also described are the results achieved as well as the basis on which water quotas were determined. Some suggestions for improving the procedures followed are included at the end of the paper, which was written during September 1984 before the drought had ended.
Author de Villiers LoubserSource: Civil Engineer in South Africa 27, pp 13 –17 (1985)More Less
Hierdie referaat boekstaaf die waterbesparingsprogram wat deur die Stadsraad van Pretoria ingestel is om voldoening te gee aan die Minister van Omgewingsake se opdragte om waterverbruik tot sekere perke in te kort. Verskeie waterbesparingsmaatreëls word bespreek en geevaluëer. 'n Glyskaaltariefstelsel, gebaseer op die toekenning van 'n afsonderlike waterkwota vir elke groot verbruiker, is in werking gestel. Hierdie stelsel wat sover vasgestel kan word uniek is, slaag daarin om die nywerhede, besighede, kantoorgeboue en woonstelblokke effektief aan die waterbesparingspoging te laat deelneem. 'n Ander glyskaal wat vir woonhuise ingestel is, word ook aangedui.
Die resultate van die gedifferensieerde glyskaaltariewe word aange, dui en bespreek. Daar word ook aangedui dat die glyskaalstrukture kragtig genoeg is om die waterverbruik verder te verminder, indien dit nodig is.
Die gesamentlike finansiele implikasies van die eenheidskostestyging weens verminderde waterlewering en die glyskaalstelsels se onsekere inkomsteproduksie word aangedui en bespreek.
Aanbevelings vir die beter hantering van toekomstige watertekorte word gemaak.
This paper records the water savings programme introduced by the City Council of Pretoria to comply with the reduction in water consumption to certain limits by the Minister of Environment Affairs.
Various measures to reduce water consumption are discussed and evaluated. A sliding scale tariff system, based on the allocation of a separate water quota for each big consumer, is discussed. This system, which is unique as far as can be ascertained, effectively ensures the participation of the business sector, industries, office buildings and blocks of flats in the water savings campaign. A different sliding scale applicable to residential properties is also indicated.
The results of the differential sliding scales are shown and discussed. The potential of these sliding scales to induce, if necessary, further reductions in water is also indicated.
The combined financial implications of the increase in the unit cost due to reduced water consumption and the uncertainties surrounding revenue estimates when sliding scales are employed, are also indicated and discussed. Recommendations are made to improve measures to deal with future water shortages.
Author P.A. AkermanSource: Civil Engineer in South Africa 27, pp 18 –27 (1985)More Less
The recent drought situation in the Pietermaritzburg / Durban region is fairly well known. This report is intended to describe the general water supply situation, cover step by step the stricter water saving measures imposed as the position worsened, and to draw certain conclusions. Much of the information could be useful to other local authorities either now or in the future, should they be in the same critical position.
Source: Civil Engineer in South Africa 27, pp 29 –31 (1985)More Less
Durban has had to endure many periods of enforced water saving during the 100 years that Engineers have been responsible for water supply to the city. Before 1983 the most serious water shortage recorded occurred in 1905 when the main dam on the Umbilo River, which supplied the City at that time, was washed away in a flood.
The most common method adopted to reduce water consumption in the past has been a restriction on the use of hosepipes and garden sprinklers. With the exception of 1905, however, it had not been necessary to resort to any harsher measures and so the extreme water shortage which confronted Durban in 1983 needed a different approach.
Author Graham TaylerSource: Civil Engineer in South Africa 27, pp 33 –36 (1985)More Less
At the beginning of 1983 it became apparent that a drought situation prevailed in the region served by the Umgeni River, that primary water storage was dwindling, and that, barring exceptional late rain, conservation measures would be necessary.
As far as the Umgeni Water Board was concerned these took the form on the one hand of adapting treatment methods fully to utilize the poorer quality of water available, and on the other hand, of making available supplies of raw water which would otherwise have gone to waste. This paper describes the Board's actions in regard to the latter.