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Water SA

versão On-line ISSN 1816-7950
versão impressa ISSN 0378-4738

Water SA vol.34 no.3 Pretoria Mar. 2008

 

An improved area-based guideline for domestic water demand estimation in South Africa

 

 

HJ van ZylI; AA IlemobadeI; JE van ZylII

ISchool of Civil and Environmental Engineering, University of the Witwatersrand, Johannesburg, South Africa
IIDepartment of Civil Engineering Science, University of Johannesburg, South Africa

Correspondence

 

 


ABSTRACT

Increased infrastructural development and potable water consumption have highlighted the importance of accurate water-demand estimates for effective municipal water services infrastructure planning and design. In the light of evolving water consumption trends, the current guideline for municipal water demand estimation, published in 1983, needs to be revised. This study investigated, using regression analyses, the combined effect of various socio-economic and climatic parameters on municipal water consumption with the objective of determining the dominant influencing parameters and suggesting a new guideline for water-demand estimation. To this end, an initial database comprising more than 2.5 x106 metered water consumption records extracted from 48 municipal treasury databases, which are located within 5 out of the 7 South African water regions was analysed. Each of the 48 municipal treasury databases spanned a period of at least 12 months. The final amalgamated database, after rigorous cleaning and filtering, comprised 1 091 685 consumption records. Single variable and stepwise multiple variable regression analyses were utilised. Results show that stand area, stand value and geographical location are the dominant parameters influencing municipal water consumption, with stand area and stand value positively correlated to water consumption. In suggesting a new municipal water-demand estimation guideline, these three parameters were considered. Stand value, however, fell away as a reliable parameter for estimating water consumption because of the inconsistent basis for predicting stand values due to the constant fluctuations in the value of property, and municipal valuations that often become outdated. Inland and coastal geographical locations exhibited different consumption patterns, with coastal stands of the same stand area and stand value consistently consuming less water than inland stands. These should therefore be treated separately in any design guideline. Stand area then became the best parameter on which to base water-demand estimations. A single guideline curve is therefore proposed which gives various confidence limits for estimating water demand in South Africa, based on stand area.

Keywords: domestic water demand estimation, area-based guideline


 

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References

BASSON MS, VAN NIEKERK PH and VAN ROOYEN JA (1997) Overview of Water Resources Availability and Utilisation in South Africa. Department of Water Affairs and Forestry P RSA/00/0197, Pretoria, South Africa. May. 72 pp.         [ Links ]

CSIR (2003) Guidelines for Human Settlement Planning and Design. The Red Book (2nd edn.). A report compiled under the patronage of the Department of Housing, South Africa.         [ Links ]

DCD, DEPARTMENT OF COMMUNITY DEVELOPMENT (1983) Guidelines for the Provision of Engineering Services for Residential Townships. The Blue Book. Pretoria, South Africa. pp F12.         [ Links ]

EDWARDS K and MARTIN L (1995) A Methodology for Surveying Domestic Water Consumption. J. Chartered Inst. Water and Environ. Manage. October (9) 477-488.         [ Links ]

GARLIPP, KDCO (1979) Water Consumption Patterns in Urban Areas. M.Sc. Dissertation. University of Pretoria, Pretoria, South Africa.         [ Links ]

GLS, GEUSTYN LOUBSER STREICHER CONSULTING and GLS SOFTWARE (2007) Swift. http://www.gls.co.za/Gls/pages/swift/overview.html. Accessed 27September 2007.         [ Links ]

HUSSELMANN ML and VAN ZYL JE (2006) Effect of stand size and income on residential water demand. J. S. Afr. Inst. Civ. Eng. 48 (3) 12-16.         [ Links ]

JACOBS HE, GEUSTEYN LC, LOUBSER BF and VAN DER MERWE B (2004) Estimating residential water demand in Southern Africa. J. S. Afr. Inst. Civ. Eng. 46 (4) 2-13.         [ Links ]

JACOBS HE and HAARHOFF J (2004) Application of a residential end-use model for estimating cold and hot water demand, waste-water flow and salinity. Water SA 30 (3) http://www.wrc.org.za/archives/watersa%20archive/2004/July-04/3.pdf        [ Links ]

JACOBS HE (2007) The first reported correlation between end-use estimates of residential water demand and measured use in South Africa. Water SA 33 (4) http://www.wrc.org.za/downloads/watersa/2007/Jul%2007/2053.pdf        [ Links ]

MIDGLEY DC, PITMAN WV and MIDDLETON BJ (1994) Surface Water Resources of South Africa. WRC Report No. 298/1/94. Water Research Commission, Pretoria, South Africa.         [ Links ]

SOLLEY WB, PIERCE, RB and PERLMAN HA (1998) Estimated Use of Water in the United States in 1995. US Department of the Interior. US Geological Society. Denver, CO: USGS.         [ Links ]

STEPHENSON D and TURNER K (1996) Water demand patterns in Gauteng. IMIESA 21 (1) 11-16.         [ Links ]

VAN VUUREN SJ and VAN BEEK JC (1997) Her-evaluering van die Bestaande Riglyne vir Stedelike en Industríële Watervoorsiening gebaseer op Gemete Waterverbruike Fase 1: Pretoria Voorsieningsgebied. WRC Report No. 705/1/97, Water Research Commission, Pretoria, South Africa.         [ Links ]

VAN ZYL JE, HAARHOFF J and HUSSELMAN ML (2003) Potential application of end-use demand modelling in South Africa. J. S. Afr. Inst. Civ. Eng. 45 (2) 9-19.         [ Links ]

VAN ZYL JE and GEUSTEYN LC (2007) Development of a National Water Consumption Archive. WRC Report No. 1605/1/07. Water Research Commission, Pretoria, South Africa.         [ Links ]

 

 

 Correspondence:
+2711 717-7153
Fax: +2711 717-7045
E-mail: Adesola.Ilemobade@wits.ac.za

Received 4 November 2007;
Accepted in revised form 16 April 2008.