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Mk2 quantifying water user trade offs at yali reservoir vietnam

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Mk2 quantifying water user trade offs at yali reservoir vietnam

  1. 1. QUANTIFYING WATER USER TRADE OFFS AT YALI RESERVOIR Bamboo Green Hotel Da Nang, 17th Sept 2013 Nguyen Viet Anh, Tarek Ketelsen, Mai Ky Vinh MK2: Valuing Multiple uses of reservoir waters: WorldFish – ICEM –IFPRI – CIEM – DLOF - CEPA
  2. 2. Contents Characteristics of water use demand Hydrological Characteristics Cost and benefit evaluations between water users • CIEM carried out the survey within 2km buffer of Yali reservoir • Surface water availability • Reservoir water allocation & flows • Storage capacity and hydro- electricity production • Economic costs & benefits • Social costs and benefits • Conclusion
  3. 3. Research scope • Water shortage occurs in Yali catchment during the dry season which is affecting agriculture and aquaculture production which are important for the provincial economy • Yali reservoir has capacity to provide dry season supply, but has not been utilized by provincial users because it was built for electricity production • There is a perceived water conflict between electricity production and consumptive use by surrounding communities • The study investigates how significant is this conflict? What is the trade off in electricity production if some reservoir waters are used for community abstraction?
  4. 4. Water consumption Item Water Demand (m3/year) 81,328,065 1. Domestic use 937,090 2. Agriculture 76,597,400 Rice 22,160,922 Corn 372,918 Casava 480,971 Tea 10,876,500 Coffee 24,478,816 Sugar cain 17,588,870 Rubber 638,402 3. Aquaculture 360,000 4. Livestock 3,433,575 Cattle 1,209,642 Pig 423,206 Poultry 1,800,727
  5. 5. Overview of the methodology _ Water availability Water demand Water availability with consumptive use Identify critical areas Rainfall Inflow Water demand Evaporation _ + _ Outflow Power Production
  6. 6. Surface water availability: Moisture budget without consumptive use
  7. 7. Surface water availability: with consumptive use
  8. 8. Water availability in the dry season
  9. 9. Surface water availability • Water availability stays in surplus during the wet season and mostly in deficit during the dry season • Surface water stress occurs around Yali reservoir catchment during the dry season (over 300mm deficit) • Small contribution of water from the reservoir could be used for irrigation within 2km buffer area • What would be the impact on power production?
  10. 10. Hydrological Model • Using MODSIM hydrological model which is developed by Colorado State University • The model was constructed using the following data: – Daily nature inflow to the reservoir (VMOD) – Daily precipitation and evaporation – Water demand – Storage capacity and power generation (CSUPD) Evaporation Precipitation
  11. 11. Scenario 1 - Baseline • Reservoir is managed exclusively for hydropower production – On average, the reservoir is full for 78 days over a year (21%) – Average annual power generated is 3,595 GWh 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 0 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000 900,000 1,000,000 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Energy(KWh) LiveStorageCapacity(1000m3) Reservoir storage Power generation
  12. 12. Scenario 2 • Reservoir water is used to meet 100% of the total water demand by agriculture, domestic and aquaculture uses within a 2km buffer zone around the reservoir • Annual water demand is 81,328,065m3 0 1000000 2000000 3000000 4000000 5000000 6000000 7000000 8000000 9000000 10000000 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Waterdemand(m3)
  13. 13. -20% -18% -16% -14% -12% -10% -8% -6% -4% -2% 0% Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Change Reservoir storage Power generation Scenario 2 compared to Baseline Wet season
  14. 14. Scenario 2 findings • Annual storage capacity and power production are expected to reduce by 0.7% and 1% respectively • Storage capacity in the dry season is reduced by 3.6% (493m3 daily) • Power production in the dry season is reduced by 3.5% (3,194kWh) • Annual economical cost from power generation reduction is 462,000USD of which 83% of the loss occurs during the dry season • However most of electricity is generated during the wet season. Dry season production is only 22% of the yearly production -4.0% -3.5% -3.0% -2.5% -2.0% -1.5% -1.0% -0.5% 0.0% Annually Dry season Wet season Change(%) Storage capacity Power generation
  15. 15. Conclusions of the water availability assessment • Relatively small change for hydro power production (i.e. 1% energy reduction annually) can have big impact on communities surrounding Yali reservoir (within 2km). Especially in the dry season, when there is water stress and higher dependency on groundwater. • 462,000USD loss from electricity production could bring greater benefit for surrounding community
  16. 16. Thank you!

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