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Agricultural Water Use in River basins : A Comparison between the Limpopo and the Indo-Gangetic – Cai X.L, Researcher – Water Resources & Remote sensing, International Water Management Institute, Southern African Office, South Africa
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Agricultural Water Use in River basins : A Comparison between the Limpopo and the Indo-Gangetic – Cai X.L, Researcher – Water Resources & Remote sensing, International Water Management Institute, Southern African Office, South Africa

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  • 1. Xueliang Cai, Bharat Sharma International Water Management Institute Agricultural Water consumption in the Limpopo and the Indo-Gangetic Basins – A Quick Comparison
  • 2. Is the comparison meaningful? Yes, it is Basin perspective, powered by remote sensing, helps… … and vast differences in social and economic situations…
  • 3. Methodology Evapotranspiration – key agricultural water consumption Actual ET map potential ET map ET a – actual Evapotranspiration , mm. E T f – evaporative fraction , unitless. ET 0 – Potential ET, mm. T x – Land Surface Temperature (LST) of pixel x from thermal data. T H /T C – the LST of hottest/coldest pixels . SSEB ET fraction map MODIS LST Daily weather station data Crop dominance map
  • 4. ET maps Actual ET map of the Limpopo for the year 2005 Actual ET map of cropland areas in the IGB for the year 2005-06 Unit: mm Limpopo IGB Average Min Max SDV Limpopo 779 88 1814 208 IGB 944 145 1629 222
  • 5. Factors affecting water consumption ETa / rainfall Crop water stress (ET a /ET p ) Higher ET at downstream areas and South African commercial irrigated areas Higher ET in Indian Punjab and Haryana and downstream areas Limpopo IGB
  • 6. Factors affecting water consumption ET a / rainfall Limpopo IGB As opposed to the Limpopo basin, the IGB with extensive irrigation clearly showed the areas where ET exceeds precipitation and where not.
  • 7. Factors affecting water consumption - IGB
  • 8. Factors affecting water consumption - Limpopo The temporal evolution of rainfall against ET at selected sites in the Limpopo basin
  • 9. Improving water management to improve agricultural water productivity IGB: targeting at bright spots? Is there enough water? Sustainability? Limpopo: how to improve yields? Regulate water consumption at the right timing?
  • 10. Thank you!