A positive effect of hydropower developmenton water availability for irrigation. The case of the Nam Ngum River in the Low...
Introduction• Population growth and economic  development in SEA induces increase in food  & energy demand• Several studie...
Study Area                                Nam Ngum Basin: one of the                                most important in Lao ...
Research Question• What are the effects of existing and proposed  hydropower development on water  availability for irriga...
Methodology• Assessed current and potential irrigation  water demand from satellite images, cropping  calendar & simple cr...
Methodology cont                                  Assessed irrigation water                                  demand (WD)  ...
Methodology         cont                Analyzed flow data recorded                since 1962-2008                      19...
Structure and functioning of the            model                 Each dam represented by a                 water balance ...
ResultsSeasonal variability flow at Tha Ngon gauging. (a) no dams_1962-1971;(b) existing dams; (c) full hydropower dev_203...
Results cont  Water availability and water supply at the Tha Ngon  gauging station in the Vientian Plain   a              ...
Conclusions• Water demand WD1 would not respect the  environment flow requirement in the dry  years if no dams existed in ...
Thank youWater for a food-secure world
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A Positive Effect of Hydropower Development on Water Availability for Irrigation

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Mekong Forum on Water, Food and Energy. 2012. Presentation from Session 7: Dams, Livelihoods and Flows

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  • Explain what are: WD1, WD2 & WD3 are irrigation water demand for existing irrigated area, potential irrigated area & maximum irrigated area. Wd is Areal water demand for dry season irrigated rice calculated from Epan, Kpan, Kc_rice & water loss throught seepage/percolation/leakage. Water loss is assumed about 50% of total water demand during the cropping cycle.
  • Explain data,,,, Analyzed flow data recorded for water availability of the period of no dams and existing dam(current)
  • The model was optimized with GAMS
  • A Positive Effect of Hydropower Development on Water Availability for Irrigation

    1. 1. A positive effect of hydropower developmenton water availability for irrigation. The case of the Nam Ngum River in the Lower Mekong Basin Somphasith Douangsavanh, IWMI-SEA Guillaume Lacombe, IWMI-SEA Justin Baker, RTI International Chu Thai Hoanh, IWMI-SEA Chanseng Phongpachith, MoNRE The Mekong Forum on Water, Food and Energy Hanoi, Vietnam, November 13-14, 2012 Water for a food-secure world
    2. 2. Introduction• Population growth and economic development in SEA induces increase in food & energy demand• Several studies have focused only on negative impacts of hydropower dams• In contrast, hydropower development could compliment irrigation development Water for a food-secure world
    3. 3. Study Area Nam Ngum Basin: one of the most important in Lao PDR (flow, population, food production & irrigation) Upstream: hydropower dev Downstream: irrigation dev in Vientiane PlainWater for a food-secure world
    4. 4. Research Question• What are the effects of existing and proposed hydropower development on water availability for irrigation in the Nam Ngum Basin Water for a food-secure world
    5. 5. Methodology• Assessed current and potential irrigation water demand from satellite images, cropping calendar & simple crop water balance• Analysed flow data recorded over 1962-2009 in combination with an optimized reservoir system model Water for a food-secure world
    6. 6. Methodology cont Assessed irrigation water demand (WD) where Water for a food-secure world
    7. 7. Methodology cont Analyzed flow data recorded since 1962-2008 1972 1974 1976 1978 1987 1989 1991 1993 2004 2006 2008 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1973 1975 1977 1979 1980 1981 1982 1983 1984 1985 1986 1988 1990 1992 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2005 2007Hydrological years: Time periods: TP1 TP2 NN1 stages: NO DAM 2 TURBINES 4 TURBINES 5 TURBINES NO WATER DIVERSION 1 DIVERSION 2 DIVERSIONS NN1 Turbine NN1 spillway Hinheup Thalat Pak Kanhoung Tha Ngon Na LuangNam Leuk diversionNam Song diversion Water for a food-secure world
    8. 8. Structure and functioning of the model Each dam represented by a water balance equation: Δvolume = Σ inflow – Σ outflow Power = Turbine flow × Diff water level × Constant Water for a food-secure world
    9. 9. ResultsSeasonal variability flow at Tha Ngon gauging. (a) no dams_1962-1971;(b) existing dams; (c) full hydropower dev_2030 a b c Water for a food-secure world
    10. 10. Results cont Water availability and water supply at the Tha Ngon gauging station in the Vientian Plain a b 203m3.s-1 WD2 c 227m3.s-1 155m3.s-1 WD3H WD3L Water for a food-secure world
    11. 11. Conclusions• Water demand WD1 would not respect the environment flow requirement in the dry years if no dams existed in the Nam Ngum Basin• Dry season flow is expected to increase by >200% and wet season, to decrease by 20%• Full hydropower development could allow current irrigation water demand to triple ( 20,824ha-56,376ha) Water for a food-secure world
    12. 12. Thank youWater for a food-secure world

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