<P> The largest dam in the system is the Theewaterskloof Dam on the Sonderend River, with a storage capacity of 480 million cubic meters, or 41% of the total storage . It is linked to the Cape Town water system through the Faure treatment works via the Kleinplass balancing dam with a tunnel system through the Hottentots Holland Mountains . The Berg River dam (130 million cubic meter) was added to this system in 2009 . </P> <P> Other storage dams of the WCWSS are the Voëlvlei Dam (159 million cubic meters), the Wemmershoek Dam (59 million cubic meter) in the Berg River basin, the Upper and Lower Steenbras Dams on the Steenbras River as well as the Palmiet Pumped Storage Scheme dams on the Palmiet River, from which water can be transferred to the Steenbras dams . </P> <P> In 2009 storage capacity in the system was increased by 17% from 768 to 898 million cubic metres through the completion of the Berg River Dam . </P> <Table> <Tr> <Th> </Th> <Th> Major Dams </Th> <Th> Capacity <P> (cubic metres) </P> </Th> <Th> Location </Th> <Th> </Th> <Th> Minor Dams </Th> <Th> Capacity (cubic <P> metres) </P> </Th> <Th> Location </Th> </Tr> <Tr> <Td> </Td> <Td> Theewaterskloof (Villiersdorp) </Td> <Td> 480188 </Td> <Td> </Td> <Td> </Td> <Td> Kleinplaats (Simon's Town) </Td> <Td> 1368 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Voëlvlei (Gouda) </Td> <Td> 164095 </Td> <Td> </Td> <Td> </Td> <Td> Woodhead (Table Mountain) </Td> <Td> 954 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Berg River (Franschhoek) </Td> <Td> 130010 </Td> <Td> </Td> <Td> </Td> <Td> Hely - Hutchinson (Table Mountain) </Td> <Td> 925 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Wemmershoek (Franschhoek) </Td> <Td> 58644 </Td> <Td> </Td> <Td> </Td> <Td> Land - en - Zeezicht (Helderberg) </Td> <Td> 451 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Steenbras Lower (Grabouw) </Td> <Td> 33 517 </Td> <Td> </Td> <Td> </Td> <Td> De Villiers (Table Mountain) </Td> <Td> 243 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Steenbras Upper (Grabouw) </Td> <Td> 31757 </Td> <Td> </Td> <Td> Lewis Gay (Simon's Town) </Td> <Td> 182 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Victoria (Table Mountain) </Td> <Td> 128 </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Alexandra (Table Mountain) </Td> <Td> 126 </Td> </Tr> </Table>

Where does most of cape town’s water supply come from