Introduction

The Sardar Sarovar Dam is a large gravity dam on the Narmada River near Navagam, Gujarat, India. It is part of the Narmada Valley Project, which includes the construction of several dams and canals to provide water for irrigation, drinking, and hydroelectric power generation. The dam has been a source of significant controversy due to its environmental and social impacts.

Background and Construction

Initial Proposal:

• The idea for damming the Narmada River dates back to the late 19th century. However, serious planning began in the mid-20th century.
• The project was conceived as part of India's broader efforts to harness its water resources for agriculture and energy needs.

Project Approval and Funding:

• The foundation stone for the Sardar Sarovar Dam was laid by Prime Minister Jawaharlal Nehru in 1961.
• After years of planning and negotiation, construction began in 1987.
• Funding came from the World Bank, the Indian government, and various state governments.

Construction Phases:

• The dam's construction involved extensive civil engineering work, including the creation of a 1,210-meter-long and 163-meter-high concrete gravity dam.
• The project also included the construction of a vast network of canals, including the Narmada Main Canal, which is the largest irrigation canal in the world.

Completion:

• The main dam structure was completed in 2006.
• The full height of the dam, reaching 138.68 meters, was achieved in 2017.

Features and Specifications

Dam Structure:

• Type: Concrete gravity dam.
• Height: 163 meters (535 feet).
• Length: 1,210 meters (3,970 feet).
• Reservoir Capacity: The reservoir, known as the Sardar Sarovar Reservoir, has a capacity of 5.8 cubic kilometers (4,720,000 acre-feet).

Power Generation:

• Installed Capacity: 1,450 MW from riverbed powerhouses and 250 MW from canal head powerhouses, totaling 1,450 MW.
• The power generated is distributed to the states of Gujarat, Madhya Pradesh, Maharashtra, and Rajasthan.

Irrigation and Water Supply:

• Irrigation: The project aims to irrigate 1.8 million hectares (4.5 million acres) of land in Gujarat, Rajasthan, Maharashtra, and Madhya Pradesh.
• Drinking Water: It provides drinking water to approximately 40 million people across these states.

Environmental Issues and Social Impact

Environmental Concerns:

• Deforestation: Large areas of forest land were submerged to create the reservoir, leading to loss of biodiversity and habitat for various species.
• Wildlife Displacement: The submergence area included critical habitats for wildlife, leading to the displacement of many species.
• Aquatic Ecosystems: The dam has altered the natural flow of the Narmada River, impacting fish populations and other aquatic life.

Social Impact:

• Displacement: The construction of the dam led to the displacement of over 200,000 people from their homes. Many of these individuals belong to indigenous communities who have lived in the area for generations.
• Resettlement Issues: The resettlement and rehabilitation of displaced people have been contentious, with many reports of inadequate compensation, poor living conditions in resettlement areas, and loss of livelihood.

Opposition and Protests:

• The Narmada Bachao Andolan (NBA), led by activists like Medha Patkar, has been at the forefront of the opposition to the dam. The NBA highlights the environmental and social costs of the project and advocates for the rights of displaced people.
• Protests and legal battles have delayed the project multiple times. In 1994, the World Bank withdrew its funding due to the controversies and lack of adequate resettlement measures.

Benefits and Current Status

Economic Benefits:

• The Sardar Sarovar Dam has significantly contributed to the regional economy by providing reliable water for irrigation, which boosts agricultural productivity.
• The hydroelectric power generated by the dam helps meet the energy needs of the region, contributing to energy security and reducing reliance on fossil fuels.

Current Operations:

• The dam is operated by the Sardar Sarovar Narmada Nigam Limited (SSNNL), a state-owned entity responsible for the management and distribution of water and electricity generated by the project.
• Continuous efforts are being made to address the environmental and social impacts, including reforestation projects and improved resettlement policies.

Future Developments:

• There are ongoing discussions about enhancing the project's benefits through additional infrastructure, such as more efficient irrigation systems and expanded power generation capacities.
• Monitoring and maintenance continue to ensure the dam's safety and operational efficiency.

Environmental Impact of the Sardar Sarovar Dam

The Sardar Sarovar Dam, while providing significant benefits in terms of irrigation, water supply, and hydroelectric power generation, has also had considerable environmental impacts. These include land submergence, loss of forests and wildlife, and broader implications associated with large dams.

Land Submerged

• Area Submerged: The creation of the Sardar Sarovar Reservoir led to the submergence of approximately 37,000 hectares (91,429 acres) of land.
• Impact on Communities: The submerged area included farmland, villages, and towns, leading to the displacement of over 200,000 people. Many of these were indigenous communities with deep cultural ties to the land.
• Impact on Agriculture: The loss of fertile agricultural land had a significant impact on local food production and livelihoods, particularly for subsistence farmers.

Impact of Large Dams

• Hydrological Changes: Large dams alter the natural flow of rivers, which can affect downstream ecosystems. Changes in sediment transport and water flow can impact soil fertility, fish populations, and the health of aquatic ecosystems.
• Seismic Risks: The weight of the water stored in large reservoirs can induce seismic activity, a phenomenon known as reservoir-induced seismicity. This has been a concern for the Sardar Sarovar Dam, given the region's geological characteristics.
• Climate Change: Large reservoirs can contribute to greenhouse gas emissions, particularly methane, due to the decomposition of submerged vegetation.

Independent Review by the World Bank

• Initial Funding: The World Bank initially provided financial support for the Sardar Sarovar Dam project.
• Independent Review: In response to mounting criticism and protests, the World Bank commissioned an independent review known as the Morse Commission, led by Bradford Morse.
• Findings: The Morse Commission's report, published in 1992, highlighted significant shortcomings in the project's planning, particularly regarding the social and environmental impacts. It criticized the inadequate resettlement and rehabilitation efforts and the lack of comprehensive environmental assessments.
• World Bank Withdrawal: Following the critical findings of the Morse Commission, the World Bank withdrew its funding for the project in 1994. This decision underscored the project's controversial nature and the need for improved oversight and accountability in large infrastructure projects.

Loss of Forests

• Deforestation: The creation of the Sardar Sarovar Reservoir resulted in the submergence of large tracts of forested land. Approximately 13,385 hectares (33,076 acres) of forests were lost, leading to significant ecological disruption.
• Biodiversity Loss: The submerged forests were home to diverse plant and animal species, many of which were displaced or lost due to the inundation. The loss of these habitats has long-term implications for biodiversity in the region.
• Carbon Sequestration: Forests play a crucial role in carbon sequestration. Their destruction contributes to increased carbon dioxide levels in the atmosphere, exacerbating climate change.

Loss of Wildlife

• Habitat Destruction: The submergence of forested and riverine habitats resulted in the displacement of numerous wildlife species. Animals such as leopards, tigers, and various bird species lost their homes.
• Aquatic Life: The dam has significantly altered the river's natural flow, affecting fish populations and other aquatic organisms. Migratory fish species, which depend on free-flowing rivers for spawning, have been particularly impacted.
• Conservation Efforts: While some efforts have been made to mitigate the impact on wildlife, such as creating wildlife sanctuaries and reforestation projects, the long-term success of these measures remains uncertain.