Water accounting in the IGB

      Upali Amarasinghe
IGB water accounting



•   Water availability in the IGB
•   Irrigation demand
•   Total water demand
•   Water accountin...
Per capita water availability
                                Total renewable wate resources/person (m3)
                 ...
Utilizable water resources
                                       Utilizable water resources
                   100%      ...
Water demand

                             11[4%]       Water withdrawals (km3)
                                          ...
Water accounting in Ganga basin
                 Water Availability                             Water accounting of utiliz...
Water accounting in Indus basin

         Water Availability in the Indus Basin                  Water accounting of utili...
Food accounting
                                   98    95                          97

                                 ...
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Water accounting in the Indo-Ganges basin

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Presented at the 2nd Phase Planning and Review Workshop of the Indo-Ganges Basin Focal Project, 24-25 February, 2009, Haryana, India. Visit http://cpwfbfp.pbwiki.com for additional information

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Water accounting in the Indo-Ganges basin

  1. 1. Water accounting in the IGB Upali Amarasinghe
  2. 2. IGB water accounting • Water availability in the IGB • Irrigation demand • Total water demand • Water accounting • Food accounting
  3. 3. Per capita water availability Total renewable wate resources/person (m3) 3,000 2,500 1990 2,000 2000 m3 1,500 1,000 2025 500 2050 - Indus- India Ganga - India Other - India Indus- Bangladesh Pakistan – IGB-India has 38% of the total renewable water resources, and – 49% of the total population in 2000 – BIMARU states of India and Bangladesh, encompassing Ganga basin, have significantly high population growth rates, – Indus has decreasing population by 2050 – Ganga basin has 42% of the population in 2000, and 55% in 2050
  4. 4. Utilizable water resources Utilizable water resources 100% 2000 80% 1600 TRWR (km3) Share (%) 60% 1200 40% 800 20% 400 0% 0 Indus Ganga Others Surface water-utilizable Groundwater utilizable Un-utilizable resources Total water resources • IGB share only 33% TRWR • Of this only 57% is utilizable • Climate change can be a threat to utilizable water resources • Augmenting PUWR through GW recharge
  5. 5. Water demand 11[4%] Water withdrawals (km3) 2 3, 1% Irrigation - [2%] 17 [6%] Surface Irrigation - 125 Groundwater [44%] 37 57 [38%] [58%] D&I - 131 Surface [46%] D&I Groundwater Indus basin • IGB account for 56% and 58% of the total and irrigation water withdrawals • In Ganga, 90% of the withdrawals for irrigation • In Indus 97% of the withdrawals for irrigation
  6. 6. Water accounting in Ganga basin Water Availability Water accounting of utilizable water supply Ganga Basin Ganga basin Unutilized Not- PUWR 250 km3 Utilizable [36%] Process 29% Utilizable - 214 km 3 evaporation 275 km 3 388 km 3 Over Surface [55%] 174 km 3 [45%] [55%] [45%] lap Non-process 34 Utilizable - 6% evaporation 138 km 3 Groundwater 10% Unrecoverabl [25%] e return flows • 55% is of TRWR is potentially utilizable • 45% of PUWR is depleted in 2000 – Not physically water scarce now • Groundwater abstraction ratio - 56%
  7. 7. Water accounting in Indus basin Water Availability in the Indus Basin Water accounting of utilizable water supply in Indus basin Unutilized Not- PUWR Utilizable 46 km3 36 Process 3 3 [36%] Utilizable - [ 53%] evaporation 33 km 67 km Surface 12 55 Over [39%] [61%] [18%] [82%] Non-process lap 6 km3 Utilizable - 7 [11%] evaporation 3 Groundwater 21 km 12 [ 8%] Unrecoverabl [25%] e return flows • 61% is of TRWR is potentially utilizable • 82% of PUWR is depleted in 2000 – Physically water scarce now • Groundwater abstraction ratio 67%
  8. 8. Food accounting 98 95 97 74 34 25 9 3 Indus Ganga Others -23 Production Consumption Production surplus • Substantial food production surpluses in Indus – More than the production deficits of all other river basins • Is it sustainable? • More crop drop!!!!
  9. 9. Thank you
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