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Figure 5.10: Depiction of in- and out-flows of water catchments into Gauteng <strong>cities</strong><br />

Zimbabwe<br />

Mussina<br />

12<br />

Botswana<br />

A<br />

Polokwane<br />

B<br />

63<br />

Mocambique<br />

D<br />

Kimberley<br />

1886<br />

18<br />

C<br />

604<br />

SA<br />

790<br />

Bloemfontein<br />

Legend<br />

Main Cities<br />

Water transfer (million m3 per annum)<br />

Main rivers<br />

Primary Catchment (SA)<br />

Secondary Catchment (SA)<br />

Gauteng Metropolotan areas<br />

SADC<br />

Pretoria<br />

D<br />

655<br />

Lesotho<br />

600<br />

Johannesburg<br />

35<br />

431<br />

T<br />

85<br />

U<br />

34<br />

Province<br />

Orange Sengu Basin<br />

Limpopo Basin<br />

Incomati Basin<br />

Umbeluzi Basin<br />

Maputo Usutu Pongola Basin<br />

51<br />

63<br />

V<br />

X<br />

Swaziland<br />

31<br />

Nelspruit (Mbombela)<br />

W<br />

Kilometers<br />

0 50 100 200 300<br />

5<br />

Source: CSIR<br />

Tshwane, Ekurhuleni and Johannesburg are located on the headwater where (i) available water from<br />

local sources cannot meet the demand, and (ii) the rivers are polluted from poorly treated effluent and<br />

solid waste. Water flows in from a number of catchments, including Lesotho, to satisfy urban demands.<br />

Equally important is that Johannesburg is at the top of the catchment, and so the runoff from the city<br />

goes into the Atlantic Ocean (for the southern area) or to the Indian Ocean via Zimbabwe and<br />

Mozambique. The highly polluted water has a substantial impact for downstream areas.<br />

Figure 5.11 shows water in-flow for eThekwini and Msunduzi, as well as out-flow into the ocean, with<br />

subsequent negative impacts on coastal life.<br />

SUSTAINABLE CITIES 179

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