Water accounting in the Indo-Ganges basin

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Presented at the 2nd Phase Planning and Review Workshop of the Indo-Ganges BFP, 24-25 February, 2009, Haryana, India

Presented at the 2nd Phase Planning and Review Workshop of the Indo-Ganges BFP, 24-25 February, 2009, Haryana, India

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  • 1. Water accounting in the IGB Upali Amarasinghe
  • 2. IGB water accounting • Water availability in the IGB • Irrigation demand • Total water demand • Water accounting • Food accounting
  • 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. 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. 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. 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. 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. 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. Thank you