Silent Valley National Park is a national park in Kerala, India. It is located in the Nilgiri hills and has a core area of . It is surrounded by a buffer zone of . This national park has some rare species of flora and fauna. Silent Valley National Park was explored in 1847 by the botanist Robert Wight. It is located in the border of Mannarkkad Taluk of Palakkad district, Nilambur Taluk of Malappuram district, Kerala, and Nilgiris district of Tamil Nadu.
It is located in the rich biodiversity of Nilgiri Biosphere Reserve. The Karimpuzha Wildlife Sanctuary, New Amarambalam Reserved Forest, Nedumkayam Rainforest in Nilambur Taluk of Malappuram district, Attappadi Reserved Forest in Mannarkkad Taluk of Palakkad district, and Mukurthi National Park of Nilgiris district are located around Silent Valley National Park. Mukurthi peak, the fifth-highest peak in South India, and Anginda peak are also located in its vicinity. The Bhavani River, a tributary of the Kaveri River, and Kunthipuzha River, a tributary of Bharathappuzha river, originate in the vicinity of Silent Valley. The Kadalundi River also originates in Silent Valley National Park.
The national park is one of the last undisturbed tracts of South Western Ghats mountain rain forests and tropical moist evergreen forest in India. Contiguous with the proposed Karimpuzha National Park () to the north and Mukurthi National Park (78.46 km2) to the north-east, it is the core of the Nilgiri Biosphere Reserve (1,455.4 km2), and is part of the Nilgiri Sub-Cluster (6,000+ km2), Western Ghats World Heritage Site, recognised by UNESCO in 2007.
Plans for a hydroelectric project that threatened the park's biodiversity stimulated an environmentalist social movement in the 1970s, known as the Save Silent Valley movement, which resulted in cancelling the project and creating the park in 1980. The visitors' centre for the park is at Sairandhri.
History
The first Western investigation of the watersheds of the Silent Valley area was in 1857 by the botanist Robert Wight. The British named the area Silent Valley because of a perceived absence of noisy cicadas. Another story attributes the name to the anglicisation of Sairandhri. A third story refers to the presence of many lion-tailed macaques Macaca silenus. In 1914, the forest of the Silent Valley area was declared a reserve forest. Between 1927 and 1976, portions of the Silent Valley forest area were subjected to forestry operations. In 1928, the location on the Kunthipuzha River at Sairandhri was identified as an ideal site for electricity generation, and in 1958 a study and survey of the area was conducted and a hydroelectric project of 120 MV costing Rs. 17 crore was proposed by the Kerala State Electricity Board.
Environmental concerns
Silent Valley is home to the largest population of lion-tailed macaques, an endangered species of primate. Public concern over threats to their habitat led to the establishment of Silent Valley National Park.
In 1973, the valley became the focus of "Save Silent Valley", India's fiercest environmental movement of the decade, when the Kerala State Electricity Board decided to implement the Silent Valley Hydro-Electric Project (SVHEP), centered on a dam across the Kunthipuzha River. The resulting reservoir would flood 8.3 km2 of virgin rainforest and threaten the lion-tailed macaque. In 1976, the Kerala State Electricity Board announced plans to begin dam construction and the issue was brought, to public attention. Romulus Whitaker, founder of the Madras Snake Park and the Madras Crocodile Bank, was probably the first person to draw public attention to the small and remote area.
On 7 September 1985 the Silent Valley National Park was formally inaugurated and a memorial at Sairandhri to Indira Gandhi was unveiled by Rajiv Gandhi, her son and the next prime minister. On 1 September 1986 Silent Valley National Park was designated as the core area of the Nilgiri Biosphere Reserve. Since then, a long-term conservation effort has been undertaken to preserve the Silent Valley ecosystem.
In 2001 a new hydro project was proposed and the "Man vs. Monkey debate" was revived. The proposed site of the dam (64.5 m high and 275 m long) is just 3.5 km downstream of the old dam site at Sairandhiri, 500 m outside the National Park boundary. The Kerala Minister for Electricity called The Pathrakkadavu dam (PHEP) an "eco-friendly alternative" to the old Silent Valley project. The claim was that the submergence area of the PHEP would be a negligible .041 km2 compared to 8.30 km2 submergence of the 1970s (SVHEP). From January to May 2003, a rapid Environmental Impact Assessment (EIA) was carried out. On 15 November, Minister for Forest Binoy Viswam said that the proposed buffer zone for Silent Valley would be declared soon.
On 21 February 2007 ex-Chief Minister A. K. Antony told reporters after a cabinet meeting that "when the Silent Valley proposal was dropped, the centre had promised to give clearance to the Pooyamkutty project. This promise, however, had not been honoured. The Kerala government has not taken any decision on reviving the Silent Valley Hydel Project".
On 18 April 2007, Kerala Chief Minister V S Achuthanandan and his cabinet approved the Pathrakkadavu Hydro-electric project and sent it to the Union Government for environmental approval.
Buffer zone Territorial forests located around the national park have been subject to a working-plan to accomplish revenue oriented objectives such as extraction of bamboo and reed which affect the long-term conservation of the park. In addition, illegal activities such as ganja (Cannabis sativa) cultivation has caused habitat degradation.
On 21 November 2009, Union Minister of Forest and Environment Jairam Ramesh and Kerala Forest Minister Binoy Viswam declared, while inaugurating the silver jubilee celebration of Silent Valley National Park in Palakkad, that the buffer zone of the Park would be made an integral part of it in order to ensure better protection of the area.
On 6 June 2007 the Kerala cabinet approved the buffer zone proposal. The new 147.22 km2 zone will include 80.75 km2 taken from Attapady Forest Range, 27.09 km2 from Mannarkkad Forest Range and 39.38 km2 from Kalikavu Forest Range and consolidated to form a new range, Bhavani Forest Range, of 94 km2 and 54 km2 would be brought under the existing Silent Valley Range of the National Park. The Cabinet also sanctioned 35 staff to protect the area and two new forest stations in Bhavani range at Anavai and Thudukki. Forest Minister Benoy Viswom said "the zone would have reserve forest status and tribals in the area would not be affected. The decision reaffirmed the commitment of the LDF Government to protection of environment. The zone is a necessity, not just of the State but also of the nation."
The proposal was then sent to Kerala Minister for Electricity, A. K. Balan, who has voiced the need for setting up the Pathrakadavu hydroelectric project in the proposed southwest buffer zone of the National Park, the Thenkara Range of the Mannarkkad Forest Division. As of 9 May 2007 Balan has not given his opinion on the buffer zone proposal.
In August 2006, the new Minister for Forests, Benoy Viswam, approved a proposal from the Conservator of Forests for a 148 km2 buffer zone around the core area of the park. The proposal says: "It is felt absolutely essential that an effective buffer of forests should be immediately formed around the national park in order to save the world famous Silent Valley National Park from all potential dangers. This can only be achieved by bringing the management of Silent Valley National Park as well as the proposed buffer zone under one management umbrella to insulate the park from all possible dangers." The proposed buffer zone will have 94 km2 in Attappady Reserve Forest east of the Kunthipuzha and 54 km2 taken from the Mannarkaad range and Nilambur south division west of the river.
In January 2006, the former Kerala Minister for Forest and Environment, A. Sujanapal, said the Government would consider the demand for a 600 km2 buffer zone for Silent Valley National Park made by Bharathapuzha Protection Committee, Malampuzha Protection Committee, One Earth One Life and Jana Jagratha. A buffer zone proposal was made in the 1986 park management plan but not implemented.
In 1979, M.S. Swaminathan, then Secretary to the Department of Agriculture, visited the Silent Valley area and suggested that 389.52 km2 including the Silent Valley (89.52 km2), New Amarambalam (80 km2), Attappadi (120 km2) in Kerala and Kunda in Coimbatore (100 km2) reserve forests, should be developed into a National Rainforest Biosphere Reserve.
On 27 October 2020 draft notification was made by Govt. of India for the area around the National park declaring it as eco sensitive zone.
Geography
Silent Valley is rectangular, twelve kilometres from north to south and seven from east to west. Located between 11°03' to 11°13' N (latitude) and 76°21' to 76°35' E (longitude) it is separated from the eastern and northern high altitude plateaus of the (Nilgiris Mountains) by high continuous ridges including Sispara Peak (2,206 m) at the north end of the park. The park gradually slopes southward down to the Palakkad plains and to the west it is bounded by irregular ridges. The altitude varies from 658 m to 2328 m at Anginda Peak, but most of the park lies within the altitude range of 880 m to 1200 m. Soils are blackish and slightly acidic in evergreen forests where there is good accumulation of organic matter. The underlying rock in the area is granite with schists and gneiss, which give rise to the loamy laterite soils on slopes.
Rivers The Kunthipuzha River drains the entire 15 km length of the park from north to south into the Bharathapuzha River. Kunthipuzha River divides the park into a narrow eastern sector of width 2 kilometers and a wide western sector of 5 kilometers. The river is characterized by its crystal clear water and perennial nature. The main tributaries of the river, Kunthancholapuzha, Karingathodu, Madrimaranthodu, Valiaparathodu and Kummaathanthodu originate on the upper slopes of the eastern side of the valley. The river is uniformly shallow, with no flood plains or meanders. Its bed falls from 1,861 m to 900 m over a distance of 12 km, the last 8 km being particularly level with a fall of only 60 m. Kunthipuzha is one of the less torrential rivers of the Western Ghats, with a pesticide-free catchment area.
Climate
Silent Valley gets copious amounts of rainfall during the monsoons, but the actual amount varies within the region due to the varied topography. In general, rainfall is higher at higher altitudes and decreases from the west to the east due to the rain shadow effect. Eighty per cent of the rainfall occurs during the south-west monsoon between June and September. The park also receives a significant amount of rainfall during the north-east monsoon between October and November.
The park being completely enclosed within a ring of hills, has its own micro-climate and probably receives some convectional rainfall, in addition to rain from the two monsoons. In the remaining months, condensation on vegetation of mist shrouding the valley is estimated to yield 15 per cent of the total water generated in the rainforest.
In 2006, the Walakkad area of the park received the highest ever annual rainfall of 9,569.6 mm. In 2000, the figure was 7,788 mm; in 2001, 8,351.9 mm; in 2004, 8465.3 mm; and in 2005, 9,347.8 mm. The annual rainfall received in the valley (at Sairandhri?) was 7,788.8 mm in 2000; 8,361.9 mm in 2001. In 2002, 4,262.5 mm; in 2003, 3,499.65 mm; in 2004, 6,521.27 mm, in 2005, 6,919.38 mm; in 2006, 6,845.05 mm; in 2007, 6,009.35 mm; and in 2008 it was 4386.5 mm. The figure till October 2009 was 5,477.4 mm. Average annual rainfall in the park between 2000 and 2008 was thus 6,066 mm.