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NATIONAL WATER RESOURCE STRATEGY SOUTH AFRICA’S WATER SITUATION AND STRATEGIES TO BALANCE SUPPLY AND DEMAND BREEDE WMA

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NATIONAL WATER RESOURCE STRATEGY SOUTH AFRICA’S WATER SITUATION AND STRATEGIES TO BALANCE SUPPLY AND DEMAND BREEDE WMA - PowerPoint PPT Presentation


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NATIONAL WATER RESOURCE STRATEGY SOUTH AFRICA’S WATER SITUATION AND STRATEGIES TO BALANCE SUPPLY AND DEMAND BREEDE WMA. WMA 18: Breede - Rainfall and Evaporation. WMA 18: Breede - Base Map. WMA 18: Breede - Land Use. WMA 18: Breede - Sectoral Water Requirements (2000).

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slide1

NATIONAL WATER RESOURCE STRATEGY

SOUTH AFRICA’S WATER SITUATION AND STRATEGIES TO BALANCE SUPPLY AND DEMAND

BREEDE WMA

slide6

Sectoral contributions to the economy (1997)

40 %

National

30 %

Breede WMA

20 %

Contribution

10 %

0 %

Other

Trade

Mining

Finance

Transport

Electricity

Agriculture

Community

Government

Construction

Manufacturing

slide11

WMA 18: BreedeGroundwater

  • Groundwater is important component of water resources in Breede WMA
  • Most of groundwater abstraction is in Warmbokkeveld and Upper Breede River Valley & Hex Valley - used for irrigation
  • Close connectivity between surface and groundwater
  • Little potential for increasing abstraction of groundwater in these areas (increased abstraction will cause corresponding reduction in surface water flow)
  • Groundwater also used for some towns (inland and coastal) as well as for rural and livestock
  • Significant quantities of water believed to be abstractable from deep fractured rock aquifers of the Table Mountain Group geological formations
slide12

WMA 18: Breede Water quality

  • Surface water and groundwater quality of high standard in upper reaches of rivers and in mountainous areas
  • Water quality in Breede River is highly impacted upon by irrigation return flows
  • Influence of geological formations also has an effect on water quality in middle reaches of Breede River with an increase in salinity further downstream
  • Water in the eastern coastal rivers is of natural high mineral content
  • Important that groundwater be carefully managed to prevent the intrusion of seawater into aquifers
  • No biological contamination of groundwater
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WMA 18: Breede Key issues

  • Water use dominated by irrigation
  • Water from the Berg WMA is stored in Breede WMA - large quantities of water transferred from Breede WMA for high value (urban, industrial) uses in the Berg WMA
  • Additional transfers to the Berg WMA likely to be required in future to serve Greater Cape Town area
  • Shortfalls in water supplies currently experienced at some coastal towns
    • mostly seasonal
    • projected to increase as result of growth in these areas
slide14

WMA 18: Breede Key issues (2)

  • Water in the Lower Breede River highly saline due to combination of geological influences and irrigation return flows - blending with fresh water is required to manage salinity levels
  • Strong interdependence between surface water and groundwater - large proportion of base flow in Breede River / Overberg Coastal being from groundwater
  • Substantial potential for further development of surface water resources - extent will depend on affordability and requirements for the Reserve
  • Climate change may have a major impact on future availability of as well as requirements for water in WMA
slide15

WMA 18: Breede Water resources under control of the Minister

  • Transfer of water between Breede and Berg WMAs at Riviersonderend/Berg River Scheme
  • Transfer out of water from Palmiet River to Berg WMA
  • Smaller transfers of water out from Breede to Berg and Olifants/Doring WMAs
  • Transfer of water into Breede WMA from Gouritz WMA for rural water supply purposes