Aliyar () Reservoir is a

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

located in Aliyar village near

Pollachi Pollachi is a town and municipality in Coimbatore district of the Indian state of Tamil Nadu. It is the administrative headquarters of Pollachi taluk. It is situated near the center of the South Indian Peninsula, surrounded by Western Gha ...

town in

Coimbatore District Coimbatore District is one of the 38 districts in the state of Tamil Nadu in India. Coimbatore is the administrative headquarters of the district. It is one of the most industrialized districts and a major textile, industrial, commercial, educa ...

Tamil Nadu Tamil Nadu (; , TN) is the southernmost States and union territories of India, state of India. The List of states and union territories of India by area, tenth largest Indian state by area and the List of states and union territories of Indi ...

South India South India, also known as Southern India or Peninsular India, is the southern part of the Deccan Peninsula in India encompassing the states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and Telangana as well as the union territories of ...

. The dam is located in the foothills of Valparai, in the

Anaimalai Hills The Anamala or Anaimalai, also known as the Elephant Mountains, are a range of mountains in the southern Western Ghats of central Kerala ( Idukki district, Ernakulam district, Palakkad district, Thrissur district) and span the border of wester ...

of the Western Ghats. It is about from Coimbatore. The dam offers some ideal getaways including a park, garden, aquarium, play area and a mini Theme-Park maintained by Tamil Nadu Fisheries Corporation for visitors enjoyment. The scenery is beautiful, with mountains surrounding three quarters of the reservoir. Boating is also available.Pollachi Dams
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History

The Aliyar Dam was constructed during 1959-1969 across the Aliyar river, mainly for

irrigation Irrigation (also referred to as watering of plants) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has bee ...

purposes. Aliyar Dam was inaugurated on 2 October 1962 (Gandhi Jayanti day) by then Prime minister of India, Pandit Jawaharlal Nehru, K Kamaraj, the Chief Minister of Tamil Nadu state presided over the function. The project was commissioned in September 2002 to generate Hydro Electric Power.

Hydrography

Aliyar lake receives water from Upper Aliyar Reservoir through the

hydroelectric Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

power station in Navamali and the Parambikulam reservoir through a contour canal. Aliyar dam, built as a part of Parambikulam aliyar project (PAP), retains a large reservoir. The dam is around in length. The lowest level outlet of the reservoir is above

Mean Sea Level A mean is a quantity representing the "center" of a collection of numbers and is intermediate to the extreme values of the set of numbers. There are several kinds of means (or "measures of central tendency") in mathematics, especially in statist ...

(MSL) and the canal intake is above MSL. The

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

is above MSL and the FRL (Full Reservoir Level) is above MSL. The maximum surface area is (1,600 acres). The volume of water at FRL is 3.864

Tmcft Tmcft, (Tmc ft), (TMC), (tmc) is the abbreviation of thousand million cubic feet (1,000,000,000 = 109 = 1 billion), commonly used in India in reference to volume of water in a reservoir or river A river is a natural stream of fresh wa ...

(). The maximum depth is and the mean depth . The volume development is 1.2 m. The highest inflow usually occurs during July and August. The shoreline is poorly indented, the shore development is poor and shallow and the

Aquatic plant Aquatic plants, also referred to as hydrophytes, are vascular plants and Non-vascular plant, non-vascular plants that have adapted to live in aquatic ecosystem, aquatic environments (marine ecosystem, saltwater or freshwater ecosystem, freshwater ...

s and

limnology Limnology ( ; ) is the study of inland aquatic ecosystems. It includes aspects of the biological, chemical, physical, and geological characteristics of fresh and saline, natural and man-made bodies of water. This includes the study of lakes, ...

of the

littoral zone The littoral zone, also called litoral or nearshore, is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely flood ...

is also very limited.Limnological studies on parambikulam Aliyar-project-I Aliyar Reservoir (Madras State), India
Journal Aquatic Sciences - Research Across Boundaries, Birkhäuser Basel, ISSN 1015-1621 (Print) 1420-9055 (Online), Volume 32, Number 2 /, September, 1970, DOI 10.1007/BF02502556, pp 405-417, SpringerLink, 11 October 2006

Fisheries

Ailyar reservoir was studied by the Central Inland Fisheries Research Institute
CFRI
for eleven years from 1982 to 1992. The rate of energy conversion at primary producer level and at the fish production level at Aliyar is considered higher than in any other Indian reservoir. The indigenous fish of the reservoir includes 40 species belonging to 13 families, plus seven stocked species

Hydel Power Project

This project consists of a series of dams interconnected by tunnels and canals for harnessing the waters of the Parambikulam, Aliyar, Sholiyar, Thunakadavu, Thekkadi and Palar rivers, flowing at various elevations, for irrigation and power generation. The scheme is an outstanding example of engineering skill. At present, the discharges are being let down through three sets of sluices/ canals, viz., Pollachi Canal, Vettaikaranpudur Canal and the river sluices. Under this scheme, the irrigation discharges let down through river sluices of the Aliyar Dam utilized for power generation in a power house at the toe of the dam. Being a micro hydel scheme, this project is subsidized by the Ministry of Non-conventional Energy Sources,

Government of India The Government of India (ISO 15919, ISO: Bhārata Sarakāra, legally the Union Government or Union of India or the Central Government) is the national authority of the Republic of India, located in South Asia, consisting of States and union t ...

Visitor information

Aliyar dam is a popular tourist destination. Near Aliyar dam are some visitor attractions including a park, garden, aquarium, play area and a mini Theme-Park maintained by Tamil Nadu Fisheries Corporation for visitors enjoyment. Temple of Consciousness is situated near Aliyar dam entrance at Arutperunjothi Nagar, where Vethathiri Maharishi resides. The scenery is beautiful, with mountains surrounding three quarters of the reservoir. Boating is also available.

Monkey Falls Monkey Falls are natural waterfalls located near the uphill ghat road Valparai on the Pollachi- Valparai road in the Anaimalai Hills range, in Coimbatore district.

is located at 6 km from the dam next to Arutperunjothi Nagar and Forest Department Checkpost. Overnight stay is possible in the forest rest house. A treetop house provides accommodation for the adventurous.Infrastructure Development & Tourism, Govt. of Tamil Nadu
/ref> The Dam and Park and the overall surroundings of the dam are very poorly maintained as of 2017.

References