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Ch 04 - Water Resources12th India People and Economy
Macro Context: The Global Water Disparity
How does India's share of global geographical area and water resources compare to its global population burden?
How does India's share of global geographical area and water resources compare to its global population burden?
DATA
High Demographic Pressure on Limited Resources
- Land Area: India occupies approximately 2.45% of the world's total surface area.
- Water Resources: It possesses only 4% of the world's freshwater resources.
- Population: Despite this, it supports roughly 16% of the world's population.
- Analytical Inference: The massive disparity between the population load and water availability is the fundamental driver of structural water stress in the Indian subcontinent.
Prism Memory Hook
Remember the 2-4-16 Rule: 2.5% Land, 4% Water, 16% People.
Hydrological Data: Precipitation to Utilisation
Out of the total annual precipitation India receives, what is the exact volume of water that is available, and how much is actually utilisable?
Out of the total annual precipitation India receives, what is the exact volume of water that is available, and how much is actually utilisable?
DATA
The Funnel of Water Availability
- Total Precipitation: Approximately 4,000 cubic km (total annual rainfall and snowfall).
- Available Water: Approximately 1,869 cubic km (Average annual flow in rivers + replenishable groundwater).
- Utilisable Water: Only 1,122 cubic km (roughly 60% of available water).
- Surface Water: 690 cubic km.
- Groundwater: 432 cubic km.
- Constraint: Severe topographical, hydrological, and technological limitations prevent the utilization of the remaining available water.
Prism Memory Hook
Precipitation 4000 -> Flow 1869 -> Use 1122.
River Systems: The 1.6 km Rule
According to official geographical data, how many 'main' rivers and tributaries exist in India, and what qualifies them as such?
According to official geographical data, how many 'main' rivers and tributaries exist in India, and what qualifies them as such?
DATA
10,360 Rivers Based on the 1.6 km Rule
- The Count: India has a network of 10,360 rivers and their tributaries.
- The Criteria: Only those rivers and tributaries with a length of more than 1.6 km are counted in this official figure.
- Total Flow: The mean annual flow across all these river basins is what constitutes India's available surface water, estimated at 1,869 cubic km.
Prism Memory Hook
Over 10,000 rivers longer than 1.6 kilometers.
Also in this chapter
43 more cards to study in Prism
- 4Surface Water: Spatial Skewness
- 5Groundwater Extraction: The Regional Divide
- 6Hydrological Data: Groundwater Concentration
- 7Basin-Wise Groundwater Utilization
- 8Coastal Resources: Lagoons and Backwaters
- 9Water Demand: Sectoral Share
- 10Sectoral Habits: Source Preferences
- 11Economic Projections: Future Water Demand
- 12Agrarian Constraints: The Need for Irrigation
- 13Rainfed Agriculture: Dryland vs. Wetland
- 14Agricultural Metrics: NSA vs. GCA
- 15Policy Response: Micro-Irrigation
- 16Ecological Crisis: The Cost of Over-Irrigation
- 17Crisis Terminology: Scarcity vs. Stress
- 18Societal Impact: The Human Cost of Water Stress
- 19Resource Parameters: Quality vs. Quantity
- 20Environmental Crisis: Defining Water Pollution
- 21Geogenic Pollution: Toxic Groundwater
- 22Surface Pollution: Critically Toxic River Stretches
- 23Urban Impact: Primary Sources of River Pollution
- 24Case Study: The Death of the Yamuna
- 25Societal Impact: Cultural Contamination
- 26Governance: Pollution Monitoring Agencies
- 27Governance: The Legislative Framework
- 28Policy Framework: Allocation Priorities
- 29Policy Paradigm: Water Pricing
- 30Sustainable Paradigms: IWRM
- 31Ecological Necessity: Environmental Flow (E-Flow)
- 32Macro-Solutions: Desalination and River Interlinking
- 33Micro-Solutions: Recycle and Reuse
- 34Grassroots Conservation: Watershed Management
- 35Policy Implementation: Watershed Programmes
- 36Case Study: The Ralegan Siddhi Transformation
- 37Case Study: The Hiware Bazar Model
- 38Conservation Techniques: Rainwater Harvesting (RWH)
- 39Engineering RWH: Technical Adaptations
- 40Indigenous Knowledge: Traditional RWH Structures
- 41State Policy: Compulsory RWH
- 42National Campaigns: Jal Kranti Abhiyan
- 43National Campaigns: Jal Shakti Abhiyan
- 44Targeted Schemes: Atal Bhujal Yojana
- 45River Rejuvenation: Namami Gange
- 46Godavari Basin Utilization
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12th India People and Economy
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