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POLYTECHNIC IWRM-MASTER PROGRAM

POLYTECHNIC IWRM-MASTER PROGRAM. Ben van der Merwe Environmental Engineering Services. STRUCTURE OF THE PRESENTATION. Water Demand Management Artificial Recharge Water Demand Forecasting Methods. WATER DEMAND MANAGEMENT. End use of water (Polytech Project)

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POLYTECHNIC IWRM-MASTER PROGRAM

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  1. POLYTECHNIC IWRM-MASTERPROGRAM Ben van der Merwe Environmental Engineering Services

  2. STRUCTURE OF THE PRESENTATION • Water Demand Management • Artificial Recharge • Water Demand Forecasting Methods

  3. WATER DEMAND MANAGEMENT • End use of water (Polytech Project) • Water losses on private properties (Whk N$ 6 m/annum) • Non-revenue water (N$ 25m+/annum) • Benchmarking according to IWA • Pressure reduction (Major benefits ) • Measuring of reduced water use (Modelling)

  4. ARTIFICIAL RECHARGE • Some results • Development of groundwater models • Security of supply • Benefit costs • Water quality (modelling)

  5. ARTIFICIAL RECHARGE INJECTION INTO BH 9/8A AT 62 KL/H

  6. ARTIFICIAL RECHARGE INJECTION INTO BH 12/3 (216 Kl/H)

  7. GROUNDWATER CONTOURS

  8. SECURITY OF SUPPLY(SWECO)

  9. ECONOMIC COMPARISON IRR NPV B/C • Phase 1 30.6% N$ 18.9m 2.33 • Phase 2 29.1% N$ 41.8m 2.71 • Phase 3 14.7% N$ 30.17 2.52

  10. WATER BANKING

  11. WATER QUALITY • High DOC values Von Bach • High TDS Goreangab • High Sulphates Goreangab • High Nitrates Goreangab

  12. DEMAND FORECASTING • Improve methods (TSA with variables) • Develop more accurate unit water use norms • Try to measure small changes in demand

  13. CONCLUSIONS • Scope for applied research • Lowering of water losses major benefit to Namibia (N$ 21m+/annum) • Start small scale AR projects in rural areas with water stress and/or bad water quality • Develop ground water models for critical supply areas • Address groundwater pollution • Establish norms for unit water use • Develop more advanced forecasting models

  14. “When the well’s dry, we know the worth of water” Benjamin Franklin

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