Untitled Page
DWA Home Page  
Untitled Page



The Western Cape Water Supply System (WCWSS) provides water to the communities of Greater Cape Town, Stellenbosch, Paarl and Wellington, as well as to towns on the West Coast and in the Swartland region. Irrigators along the Berg and Eerste rivers and irrigators and urban users in the Riviersonderend catchment, in the Breede Water Management Area (WMA), also receive water from the system. The major water user from the WCWSS is the urban sector within the City of Cape Town (CCT).

The main storage dams of the WCWSS are the Theewaterskloof and Voëlvlei dams (owned and operated by the Department of Water and Sanitation (DWS); the Berg River Dam (owned by the Trans Caledon Tunnel Authority and operated by the DWS) and the Wemmershoek, Upper Steenbras and Lower Steenbras dams (owned and operated by the CCT). The water storage in the system is evaluated towards the end of the wet season (no later than 1 November), to assess whether or not supplies must be restricted for the following year, to ensure that sufficient water remains for the more essential uses, were a drought to occur. The dams are operated as an integrated system to minimise spillage and maximise storage during drought months.

Operational challenges include the need for close co-operation between the DWA and CCT and with authorities such as Eskom, management of varying water quality, and the operation of the Riviersonderend–Berg River Tunnel system, that provides the means of transferring water from the Breede-Gouritz WMA into the Berg-Olifants/Doorn WMA.


Figure 3: Western Cape Water Supply System Area




Untitled Document
This site is best viewed with Internet Explorer 10 (or newer) and Mozilla Firefox 32.0 (or newer) at 1024x768 screen resolution.Click here to download Internet Explorer 11 or click here to download Firefox 32.
DWS Sitemap
If you experience any challenges regarding this site, please contact the Webmaster.