CAPE TOWN WATER RESILIENCE. On behalf of Water and Sanitation Department August 2017
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1 CAPE TOWN WATER RESILIENCE On behalf of Water and Sanitation Department August 2017
2 Water consumption in Cape Town (2016 / 17)
3 Water Treated per year (million m 3 ) Population (millions) Population Growth and Water Use Efficiency City s demand-side programme has flatlined consumption since Water Treated Population Expon. (Population)
4 Water Allocations and Actual Demand Proposed COCT Augmentation Schemes Accelerated (Additional 15 Mm3) Allocation from Berg River Dam (84 Mm3) Fully Financed by CCT 20 % Saving Mm3 Combined allocations from Voelvlei, Wemmershoek, Theewaterskloof and Steenbras Dams plus Palmiet Transfer (320 Mm3)
5 City of CT dams - 20 year volume of water stored
6 WCWSS Storage Record 75% 62% 45-50% 30% 15-20%
7 Full Domestic and Business Water Tariffs (2017/18) Tariff Step (KL) Step 1 (0-6) Step 2 (6-10.5) Step 3 ( ) Step 4 (20 35) Step 5 (35 50) Step 6 > 50 Level 1 (10%) Level 2 (20%) Level 3 (30%) Level 4 (40%) Commercial & industrial tariffs
8 Scenarios developed end of May Grind it Out The drought is temporary in nature, and will break. There will inevitably be some amount of rain in the winter of Ramp it Up The 2017 winter rainfall will be substantially lower than the historical record. The drought continues for at least one more year. The New Normal Previous climate models cannot be relied upon. We are experiencing the harsh impacts of climate change. Over reliance on surface water is a risk.
9 New Normal Water Resilience o o o o o o The days of plentiful water supply have past. Good rainfall years should be considered anomalous as opposed to drought years We must all adapt to water scarcity. This does not mean lower living standards or a diminished economy. The old water scarcity must become enough water The current situation presents an opportunity to build a new relationship with water. We must rethink our over-reliance on surface water and seek to build a Water Sensitive City Now is the time to build resilience. It is our collective responsibility We need to formulate a new relationship with risk as climate change adds significant uncertainty. Ultimately we need to make difficult choices for our future prosperity and seek a coalition of the best minds.
10 Portfolio Response Water Resilience Portfolio Disaster Management Emergency Tactical Strategic Financial Strategy Technical Strategy Communication Strategy Household and Business Adaptation
11 Technologies Total Ml/day per Location / s technology Immediate & 1 st Tranche Groundwater Extraction 100 Atlantis & Silverstroom Cape Flats Cape Peninsula Desalination land based containers Hottentots Holland 50 Koeberg, Silverstroom, Woodbridge Island, Granger Bay, Hout Bay, Red Hill, Strandfontein, Monwabisi, Harmony Park Desalination - barge 50 Cape Town Harbour 2 nd tranche Water reuse 50 Zandvliet WWTW, Belville WWTW, Fisantekraal WWTW, Potsdam WWTW, Cape Flats WWTW, Macassar WWTW Desalination land based 50 Cape Town Harbour permanent Extreme tranche Desalination marine based 200 Cape Town Harbour Gordons Bay TOTAL 500
12 Future Water Outlook Key considerations: Growing regional demand and competition for water Climate change requires diversification of water sources and improved water use efficiency Unit cost of water is likely to increase as more costly alternatives to surface water schemes are implemented Opportunity provided by current water crisis must be maximized to effect quantum leap change to the way water is resourced and utilized in CT. Drive towards Cape Town as a Water Sensitive City that: Optimises and integrates the management of all available water resources surface, ground, wastewater and stormwater - to improve resilience Places high value on water and strives to increase water use efficiency through water sensitive urban design
13 The Future Cape Town a Water Sensitive City
14 Non-potable water options for irrigation Groundwater boreholes, wellpoints and springs on property. With appropriate permissions. Register with City if under 10,000 liters per day and apply for water use licence from national Water & Sanitation Dept if more Greywater complexity, including real health risks and longterm damage to the soil. Not recommended unless used very conditionally. Guidelines being developed Rainwater and stormwater- check quality, sufficient storage Treated effluent. Contact:
15 Thank You
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