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| Mullaperiyar Reservoir | |
|---|---|
| Name | Mullaperiyar Reservoir |
| Location | Idukki district, Kerala — near Thekkady, Periyar National Park |
| Country | India |
| Coordinates | 9.796°N 77.119°E |
| Type | Reservoir |
| Inflow | Periyar River |
| Outflow | Periyar River |
| Catchment | Periyar Basin |
| Basin countries | India |
| Operator | Kerala Water Resources Department / Government of Tamil Nadu |
| Dam type | Masonry gravity dam |
| Length | 365 m |
| Height | 53.6 m |
| Volume | 3.4 million m³ |
| Opening | 1895 |
Mullaperiyar Reservoir The Mullaperiyar Reservoir is an artificial impoundment created by a 19th-century masonry gravity dam on the Periyar River at the confluence of the Western Ghats in Kerala and used largely to provide irrigation and hydroelectric regulation for Tamil Nadu. The project, conceived during the British Raj and executed with colonial-era engineering, remains central to inter-state water allocation, legal contestation, structural safety debates, and regional ecology involving Periyar National Park, local tribal communities, and downstream agrarian districts such as Dindigul and Madurai.
The reservoir originated from a 19th-century agreement between the Travancore Kingdom and planters in Madras Presidency driven by irrigation needs in Cumbum Valley, implemented under policies of the British East India Company and later oversight by the Madras Presidency bureaucracy. Major actors included the Diwan of Travancore office, colonial engineers influenced by techniques pioneered after the Great Famine of 1876–78, and contractors linked to Thomas Munro-era civil works traditions. Key milestones involved the 1886 signing of the lease framework, the 1895 completion of the dam under the supervision of engineers associated with institutions like the Institution of Civil Engineers (London), and subsequent modifications during the Indian Independence era under successive administrations such as the State of Madras and later Tamil Nadu and Kerala governments.
The dam is a masonry gravity structure built using lime mortar and stone masonry techniques contemporary to late 19th-century works similar to projects around the Nilgiris and the Anamalai Hills. Lead engineers drew upon precedents from the Ganges Canal era and training at establishments connected to the Royal Indian Engineering College. The structure spans the Periyar gorge near Mullaperiyar village and interfaces with diversion works feeding the Suruliyar Dam system and irrigation canals historically serving the Cumbum and Theni regions. Construction logistics involved pack-animal routes through the Cardamom Hills, materials supplied from quarries near Thodupuzha, and survey inputs referencing maps from the Survey of India.
The reservoir impounds water from the Periyar catchment within the Western Ghats rainforest complex and exhibits seasonal storage variations governed by the Southwest Monsoon and Northeast Monsoon cycles. Normal storage capacity, full tank level, and maximum water level are engineering parameters maintained by structured measurements using techniques endorsed by the Central Water Commission and the Irrigation Department of Tamil Nadu. The reservoir supports regulated releases to the Mullaiperiyar diversion tunnel that transfers flows across the Palakkad Gap-proximate ridge into the Vaigai River basin, sustaining irrigation extents mapped in district plans for Dindigul district and Theni district.
Inter-state water allocation has been contested in litigation invoking instruments like the Inter-State River Water Disputes Act, 1956 and adjudication forums including the Supreme Court of India and various Tamil Nadu and Kerala government negotiation committees. Central legal episodes include petitions heard in the Supreme Court by benches comprising jurists with reference points to precedents such as disputes over the Cauvery River. The lease arrangements originating from the Travancore era and subsequent renewal attempts have prompted arbitration-like proceedings, directed commission reports, and interventions by the Ministry of Water Resources and parliamentary committees.
Safety debates encompass assessments by civil engineering bodies like the Indian National Academy of Engineering and monitoring agencies such as the Central Water Commission and state-level irrigation departments. Concerns cited include aging mortar, seepage, hydrostatic uplift, and seismic vulnerability due to proximity to faults linked to the Bengal and Bombay Shield tectonic blocks and seismic events recorded at the Seismological Observatory network. Proposed interventions have ranged from periodic re-mortaring, construction of replacement concrete dams modeled after projects like Idukki Dam and Bhakra Dam, to construction of an alternative storage in Kundala-adjacent basins. Episodes of public mobilization have involved elected representatives from Kerala Legislative Assembly and Tamil Nadu Legislative Assembly, technical committees chaired by alumni of the Indian Institute of Science, and recommendations referencing standards from the Bureau of Indian Standards.
The reservoir lies adjacent to biodiverse landscapes including Periyar Tiger Reserve and habitats for species catalogued by conservationists from the Tamil Nadu Forest Department and Kerala Forest Department. Impoundment has affected endemic flora and fauna distributions noted in surveys by researchers affiliated with Tropical Botanic Garden and Research Institute and the Salim Ali Centre for Ornithology and Natural History. Hydrological alteration has influenced sediment transport to the Vaigai River basin, riparian floodplain dynamics near Cumbum, and habitat connectivity in corridors used by Asian elephant populations monitored by the Wildlife Institute of India. Environmental impact assessments have been produced in consultation with NGOs such as the World Wide Fund for Nature and scholars from institutions like the University of Madras.
The reservoir underpins irrigation for agricultural districts cultivating crops tied to markets in Madurai, Chennai, and export routes via the Chennai Port. Water from the diversion sustains livelihoods of farmers in taluks including Cumbum and Periyakulam and supports ancillary sectors such as sugarcane processing linked to mills in Tirunelveli and Dindigul. Politically, the dam figures in electoral discourse involving leaders from parties like the Dravida Munnetra Kazhagam and the Communist Party of India (Marxist), and negotiation interventions by central ministries during coalition governments including the United Progressive Alliance and the National Democratic Alliance. The reservoir’s future implicates regional planning authorities, disaster management agencies such as the National Disaster Management Authority, and transboundary resource frameworks modeled on examples like the Indus Water Treaty in terms of dispute resolution mechanics.
Category:Dams in Kerala Category:Reservoirs in India