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Water Resources of India

India occupies about 2.45 per cent of the world's surface area but supports more than 17 per cent of the world's population. It has about 4 per cent of the world's water resources. The total water available from precipitation in India annually is approximately 4,000 cubic kilometers. However, the total surface water and replenishable groundwater resources together amount to about 1,869 cubic kilometers. Out of this, only 60 per cent is utilizable due to various physical and socio-economic constraints. Hence, the total utilizable water resource in India is about 1,122 cubic kilometers. This water is unevenly distributed across the country in space and time, influenced by factors such as rainfall distribution, river basin size, and topography. The management and conservation of these water resources are crucial for sustainable development, given the increasing demand and limited availability.

• India has 4% of the world's water resources but 17% of the world's population.
• Total annual precipitation water is about 4,000 cubic km.
• Surface water and replenishable groundwater total 1,869 cubic km.
• Only 60% of water resources are utilizable due to constraints.
• Total utilizable water resource is approximately 1,122 cubic km.
• Water availability varies spatially and temporally across India.
• 📌 Water resources: Sources of water useful for human consumption and activities.
• 📌 Utilizable water resource: Portion of total water resources that can be effectively used.
• 📌 Precipitation: Water released from clouds in the form of rain, snow, sleet, or hail.

Surface Water Resources

Surface water in India primarily comes from rivers, lakes, ponds, and tanks. The country has about 10,360 rivers and their tributaries longer than 1.6 km each. The mean annual flow in all river basins is estimated at 1,869 cubic km. However, only about 690 cubic km (32%) of this surface water is utilizable due to topographical, hydrological, and other constraints. River water flow depends on the size of the catchment area and rainfall within it. Major rivers like the Ganga, Brahmaputra, and Indus have large catchment areas with high precipitation, accounting for 60% of the total surface water resources despite covering only one-third of the country's area. South Indian rivers such as the Godavari, Krishna, and Kaveri have largely been harnessed for water use, but significant potential remains in the Brahmaputra and Ganga basins. The spatial and temporal variability of rainfall, mainly concentrated in the monsoon season, affects river flow and water availability.

• Surface water sources: rivers, lakes, ponds, tanks.
• India has over 10,360 rivers and tributaries longer than 1.6 km.
• Mean annual river flow is about 1,869 cubic km.
• Only 32% (690 cubic km) of surface water is utilizable.
• Ganga, Brahmaputra, and Indus basins have 60% of surface water resources.
• South Indian rivers are largely harnessed; Brahmaputra and Ganga basins have untapped potential.
• 📌 Surface water: Water present on the earth's surface in rivers, lakes, ponds, and tanks.
• 📌 Catchment area: The area from which rainfall flows into a river or reservoir.
• 📌 River basin: The land drained by a river and its tributaries.