Expert Committee Defers ₹1,875-Crore Koraiyar Reservoir Project

Chennai, India Jul 11, 2026 ALN: The Expert Appraisal Committee (EAC) of the Union Environment Ministry has made a significant decision by deferring the grant of Terms of Reference (ToR) for the proposed ₹1,875-crore Koraiyar reservoir project located in the Tirunelveli district of . This decision underscores the ongoing tension between developmental projects and environmental conservation, particularly in ecologically sensitive areas such as the Kalakkad Mundanthurai Tiger Reserve (KMTR), where the project is proposed to be situated.

The Koraiyar reservoir project aims to construct a dam across the Koraiyar River at Vickramasingapuram in Ambasamudram taluk. The primary objective is to irrigate a cultural command area of approximately 9,091.5 hectares (ha), thereby significantly increasing agricultural productivity in a region characterized by drought conditions. The project plans to harness monsoon flood flows from the Koraiyar, which is a tributary of the Tamirabharani River, for multiple purposes including irrigation, flood moderation, and groundwater recharge.

Specifically, the reservoir is projected to have a dam height of 43 meters and will require substantial water resources during its construction phase, estimated at about 16.95 kilolitres per day. The project has been categorized as a Category A proposal for environmental appraisal due to its location within the tiger reserve, despite the fact that its command area would typically classify it under Category B1. This classification reflects the heightened scrutiny that such projects face when they intersect with protected ecosystems.

Proponents of the project argue that the reservoir would expand the irrigated area from the current 1,225.66 ha to 9,091.5 ha, which is critical for farmers in drought-prone regions such as Alangulam, Manur, and Tirunelveli taluks. These areas have been experiencing significant water scarcity, and the assurance of irrigation is seen as a vital step towards improving agricultural yields and livelihoods. Additionally, the project is expected to stabilize existing irrigation systems, enhance groundwater recharge, and mitigate downstream flooding, which are all pressing concerns for local communities.

However, the EAC has expressed serious concerns regarding the ecological implications of the project, particularly given its location within the KMTR. This reserve is recognized for its rich biodiversity, being home to various species including tigers, Nilgiri langurs, and a range of endemic flora and fauna that could be adversely affected by the construction of the reservoir. The committee highlighted that the project would require 819.21 ha of land, of which 186.74 ha is forest land and 632.48 ha is non-forest land. Notably, the submergence area would cover 278.11 ha, including 156.44 ha of reserve forest, raising alarms about habitat destruction and loss of biodiversity.

Furthermore, the EAC pointed out that the project proponent had not yet applied for Stage-I forest clearance, which is a necessary step for projects that involve the use of forest land. This omission raises questions about the preparedness and environmental compliance of the project proposal. The committee also noted that the proponent had not sufficiently explored alternative options that could deliver similar irrigation benefits without the associated ecological risks. It recommended that the Water Resources Department (WRD) consider alternative reservoir sites in the headwaters of the Chittar basin, which could potentially augment the capacities of existing tanks such as Manur and Pallamadai. This approach could provide the intended irrigation benefits with lower financial investments and minimized environmental impacts.

During the deliberations, the EAC further suggested examining the feasibility of relocating the proposed dam to other undammed tributaries of the Chittar river basin that lie outside the tiger reserve. Such a move could significantly mitigate the adverse effects on wildlife habitats and the overall ecosystem. The committee emphasized the importance of conducting a comprehensive analysis of alternatives, which should include different project locations, configurations, and designs. This analysis is expected to be supported by site-specific studies, maps, and technical, ecological, and economic comparisons that would provide a clearer picture of the potential impacts and benefits of the project.

In summation, the EAC's decision to defer the Koraiyar reservoir project reflects a broader commitment to balancing developmental needs with environmental protection. As the demand for water resources increases in the face of climate change and population growth, projects like these will continue to be scrutinized for their ecological footprints. The committee's directive for a thorough examination of alternatives not only aims to protect the sensitive ecosystems of the KMTR but also encourages a more sustainable approach to resource management that could serve as a model for future projects in similar contexts. The implications of this decision extend beyond the immediate project, highlighting the need for ongoing dialogue and collaboration between governmental bodies, environmental organizations, and local communities to achieve sustainable development goals.

The Koraiyar reservoir project is emblematic of the challenges faced by many developing nations, where the need for infrastructure development often clashes with environmental conservation efforts. In India, where agriculture is a primary source of livelihood for a significant portion of the population, the demand for irrigation facilities is particularly acute, especially in regions prone to drought. The project was envisioned as a solution to these challenges, aiming to alleviate water scarcity and improve agricultural productivity in a region that has historically struggled with insufficient water supply.

However, the ecological costs of such projects can be substantial. The KMTR is not just a protected area; it is a critical habitat for a variety of species that are already threatened by habitat loss and climate change. The presence of tigers, for instance, indicates a healthy ecosystem, as they are apex predators that rely on a balanced environment to thrive. Any disruption to this habitat can have cascading effects on the entire ecosystem, impacting not just the species that inhabit it but also the local communities that depend on these natural resources for their livelihoods.

The EAC’s decision to defer the project until further studies and alternative options are explored reflects a growing recognition of the importance of sustainable development practices. By advocating for a comprehensive analysis of alternatives, the committee is not only prioritizing environmental concerns but also emphasizing the need for innovative solutions that can meet the demands of development without compromising ecological integrity. This approach is in line with global trends towards more sustainable project planning and implementation, where environmental assessments are integral to project design and approval processes.

In conclusion, the Koraiyar reservoir project serves as a case study in the complexities of balancing development with conservation. The EAC's decision to defer the project highlights the need for a thoughtful and inclusive approach to resource management that considers the long-term implications of development projects on both the environment and local communities. As India continues to grapple with the impacts of climate change and the demands of a growing population, the lessons learned from this project could inform future initiatives, ensuring that they are both economically viable and environmentally responsible.