CONSIST OF MAJOR RIVERS AND DAMS IN TAMILNADU (FULL DESCRIPTION) AND MAJOR RIVERS OF INDIA (LIST)

1. WELCOME

2. PROSPECTS OF RIVER BASIN SYSTEM
OF IRRIGATION IN TAMILNADU
CHAIRMAN
Dr. G. B. SUDHAGAR RAO
Assistant Professor
Dept. of Agronomy
MEMBERS
Dr. K. THANUNATHAN
Professor and Head
Dept. of Agronomy
Dr. M.V. SRIRAMACHANDRASEKHARAN
Professor
Dept. of Soil Science and Agricultural Chemistry PRESENTED BY
E.T.VIGNESH
II M.Sc. Agronomy
Reg. no: 11633

3. INTRODUCTION
A river is a natural flowing watercourse, usually
freshwater, flowing towards an ocean, sea, lake or
another river.
Small rivers can be referred to using names such as
stream, creek, brook, rivulet, and rill.
Potamology is the scientific study of rivers, while
limnology is the study of inland waters in general.
Rivers are part of the hydrological cycle.

4. The average annual precipitation received in India is 4,000 km3,
out of which 700 km3 is immediately lost to the atmosphere, 2,150
km3 soaks into the ground and 1,150 km3 flows as surface runoff.
The total water resources in the country have been estimated as
1,953 km3. Nearly 62% or 1,202 km3 of the total water resources
is available in the Ganga-Brahmaputra-Meghna basin.
 The remaining 23 basins have 751 km3 of the total water
resources.
The annual water availability in terms of utilizable water resources
in India is 1,122 km3.

5. PER CAPITAAVAILABILITY OF WATER
- (://nihroorkee.gov.in/rbis/India_Information/Water%C2%A0Budget.htm)
Year 1951 1991 2010 2025 2050
Population (106) 361 846.3 1,157 1,333 1,581
Average Water Resources
(m3/person/year)
3,008 128.3 938 814 687

6.  Meghna River Basin
 Brahmaputra River Basin
 Ganges River Basin
 West Bengal Coastal
 Odisha Coastal
 Godavari River Basin
 Krishna River Basin
 Pennar River Basin
 Cauvery River Basin
 Tamil Nadu Coastal Rivers
IMOPRTANT RIVER BASIN IN INDIA
RIVERS FLOWING INTO BAY OF BENGAL

7.  Indus River Basin
 Sabarmati River Basin
 Mahi River Basin
 Narmada River Basin
 Tapi River Basin
 Maharashtra Coastal Rivers
 Coastal rivers of Goa
 Karnataka Coastal Rivers
 Kerala Coastal Rivers
RIVERS FLOWING INTO ARABIAN SEA

8. LIST OF RIVERS IN TAMILNADU
 Adyar river
 Amaravati river
 Arani river
 Arasalar river
 Bhavani river
 Chittar river
 Cooum river
 Cheyyar river
 Gingee river
 Gomukhi river
 Goddar river
 Gadananathi river
 Hanumannathi river
 Harichandra river
 Jambunathi river
 Kabini river
 Cauvery river
 Kedilam river
 Kollidam river
 Komugi river
 Kundha river
 Kowsika river
 Kosasthalaiyar river
 Manimuthar river Cond..,

9.  Moyar river
 Mudikondan river
 Mottaiyar river
 Mullaiyar river
 Noyyal river
 Naganathi river
 Nattar river
 Pachaiyar river
 Pambar river
 Palar river
 Ponnaiyar river
 Pykara river
 Sankaraparani river
 Shanmuganadhi river
 Siruvani river
 South pennar river
 Sarabanga river
 Thamirabarani river
 Thenpennai river
 Thennar river
 Uppar river
 Vaigai river
 Vaippar river
 Vanniyar river
 Varaganathi river
 Vellar river
 Vettar river
 Vennar river

10. LIST OF MAJOR RIVERS IN TAMILNADU
According to India- WRIS (Water Resources Information System of
India) these are the major rivers of Tamilnadu
1. Cauvery River
2. Palar River
3. Thenpennai
4. Vaigai River
5. Thamirabarani River

11. CAUVERY RIVER
 The Cauvery (or Kaveri in Tamil) is a large Indian river.
 The origin of the river is at Talakaveri, Kodagu in Karnataka, flows
generally in southeast direction through Karnataka and Tamil Nadu, and
emptying into the Bay of Bengal through two principal mouths in
Poompuhar, Tamil Nadu.
 The Cauvery basin is estimated to be 81,155 square Kilometres with many
tributaries including the Shimsha, Moyar River, Hemavati, Arkavati,
Honnuhole, Lakshmana, Kabini, Lokapavani, Bhavani River, the Noyyal
and the Amaravati River.

12. - (INDIA - WRIS Project)

13. Conts…,
 The river's basin covers three states and one Union territory, as follows: Tamil
Nadu, 43,856 square kilometres, Karnataka, 34,273 square kilometres, Kerala,
2,866 square kilometres, and Puducherry 160 square kilometres.
 In Mandya district, it forms two islands Srirangapatna and Shivanasamudra.
First comes the Srirangapatna and then comes Shivanasamudra. At
Shivanasamudra the river drops 98 meters (320 ft), forming the famous
Shivanasamudra Falls.
 Where, Asia's first hydroelectric plant (built in 1902) was on the left falls and
supplied power to the city of Bangalore.

14.  The primary uses of Cauvery is providing water for irrigation, water for
household consumption and the generation of electricity.
 An estimate at the time of the first Five Year Plan puts the total flow of the
Cauvery at 15 cubic kilometres, of which 60 percent was used for
irrigation.
 Dams, such as the Krishna Raja Sagara Dam has a capacity of 49 TMC.
and the Mettur Dam or Stanley Reservoir has a capacity of 93.4 TMC.
(Thousand Million Cubic ft), store water from monsoon periods and
release the water during the dry months.
 Even so, during the months of February–May, water levels are often quite
low, and some channels and distributaries riverbeds may become dry.
Flow generally begins to increase in June or July.
IRRIGATION

15. Krishna Raja Sagara Dam (KRS)

16. Mettur Dam

17.  In Tamilnadu Cauvery flows through districts such as Krishnagiri, Dharmapuri,
Salem, Erode, Namakkal, Karur, Tiruchirapalli, Thanjavur, Thiruvarur, Cuddalore
and Nagapattinam.
 The crops grown in the basin vary from region to region, however major crops
are Paddy, sugarcane and Jowar. Apart from these, some other crops such as
Banana, Betel vine, Gingili, Onion, Cotton, Black gram are also grown.
- (K.Palanisami et al.,2011)

18. AREA UNDER PADDY
 Major paddy producing areas
are eastern coastal or deltaic
regions of Tamil Nadu i.e.
Thanjavur and Nagapattinam.
Cuddalore and Pudukottai are
also the areas where paddy
cultivation is done at a large
scale.
- (www.indiawaterportal.org)

19. AREA UNDER SUGARCANE
 Cuddalore in Tamil Nadu is
the major sugarcane growing
district in the entire basin.
Dharampapuri, Erode and
Namakkal are other areas that
cultivate sugarcane in some
areas.
- (www.indiawaterportal.org)

20. AREA UNDER JOWAR
 Coimbatore, Dindigul in Tamil
Nadu are the districts that
cultivate jowar. some other
areas also under jowar
cultivation as in the south east
of the basin. Jowar, it appears
is not grown in the costal belt.
- (www.indiawaterportal.org)

21. WATER BUDGET FOR CAUVERY RIVER
 Keeping in view the damages caused by the recent floods, as a measure
of permanent flood control initiatives, this Government will take up
flood prevention works like widening the drainage channels and
strengthening bunds and river banks in Cuddalore District at a cost of
Rs.140 crores with the financial assistance of NABARD during 2016-
2017.
- (Budget speech – Tamilnadu 2016- 2017).

22. BHAVANI RIVER
 Bhavani is a major river in Kongu Nadu region of Tamil Nadu, India.
 It is the second longest river in Tamil Nadu and a major tributary of the Cauvery River.
IRRIGATION
 Bhavani river originates from Nilgiri hills of the Western Ghats, enters the Silent Valley National Park in
Kerala and flows back towards Tamil Nadu.
 The Bhavani is a 217-kilometre long perennial river fed mostly by the southwest monsoon and
supplemented by the northeast monsoon.
 Its watershed drains an area of 0.62 million hectares spread over Tamil Nadu (87%), Kerala (9%) and
Karnataka (4%).
 About 90 per cent of the river's water is used for agriculture irrigation.
 It has two dams namely Bhavanisagar dam (Capacity of 32.8 TMC) and Kodiveri dam, it was constructed
by Kongalvan in the year 1125 AD.

23. VIEW OF BHAVANI RIVER
- (INDIA – WRIS project)

24. CROPS GROWN & WATER BUDGET FOR BHAVANI
RIVER BASIN
 It flows majorly in Erode and Coimbatore districts of Tamilnadu. The Major crop
of this basin are Paddy, Sugarcane, Banana, Turmeric, Tapioca and Millets.
 The Lower Bhavani Project was the first major irrigation project initiated in India
after independence in 1948. It was completed by 1955 and opened for use in 1956.
 The dam was constructed at a cost of ₹210 million.
- (Budget speech – Tamilnadu 2016- 2017).

25. Bhavanisagar Dam

26. CHANGING CROPPING PATTERN IN THE LOWER
BHAVANI PROJECT CANAL: 1952/53 TO 1962/63
- (Velayutham Saravanan, 2001)
YEAR PADDY
(in acres)
COTTON
(in acres)
MILLETS
(in acres)
OTHER CROPS
(in acres)
AREA
CULTIVATED
(in acres)
1952/3 - - 2,947 - 2,947
1953/4 1,271 1,416 4,138 2,358 9,183
1954/5 12,510 26,825 24,995 8,709 73,019
1955/6 17,190 36,015 27,971 20,737 101,913
1956/7 32,529 43,136 39,787 21,011 136,463
1957/8 61,898 29,031 44,134 53,127 188,190
1958/9 66,557 19,886 48,229 74,541 209,250
1959/60 27,797 8,989 22,489 50,141 154,416
1960/1 82,446 7,887 15,981 42,077 148,391
1961/2 115,714 3,648 16,655 45,753 181,720
1962/3 130,094 5,208 10,499 33,150 178,948

27. PALAR
The Palar Basin is an important basin among the 12 basins lying
between the Pennar and the Cauvery basins.
Though most of the drainage area lies in Tamil Nadu, its drainage area
extends to cover the South-East and South-Western parts of Karnataka
and Andhra Pradesh respectively.
The Palar drains an area of 17,871 Sq.Kms out of which nearly 57
percent lies in Tamil Nadu and the balance in the states of Karnataka
and Andhra Pradesh.

28. IRRIGATION
 The river Palar rises beyond Talagvare village in the Kolar district of
Karnataka state at an elevation of about 900 m above MSL.
 The total length of this river from its origin to its outfall into the Bay of
Bengal is about 348 Km.
 The flow is generally in the South-Easterly direction for the first 93
KM, in the Kolar District of Karnataka, before entering the Chittoor
District of Andhra Pradesh, through which it flows for another 33 Km.
 After traversing for another 222 Kms in Vellore and Kanchipuram
Districts in Tamil Nadu, the river Palar finally discharges into Bay of
Bengal near Kuvattur.

29. – (India WRIS project)

30. Conts…,
 Palar has two important tributaries i.e the Poini and the Cheyyar.
 The net irrigated area under Palar basin in Tamilnadu was about 5.3
lakh ha.
 It flows majorly in Vellore and Kanchipuram districts of Tamilnadu.
The Major crop of this basin are Paddy, Jowar, Ragi, Redgram,
Sugarcane, Banana, Coconut and Cotton.
- (K.Palanisami et al.,2011)

31. PONNAIYAR
 The Ponnaiyar (South Pennar) is a river in southern India.
 It rises on the hill of Nandidurga in Chikkaballapura District of
Karnataka state, flowing south and then east for 400 km through
Karnataka and Tamil Nadu, emptying into the Bay of Bengal at
Cuddalore.
 Tiruvannamalai is the largest city in the path of Ponnaiyar River.
 The South Pennar River is known as Dakshina Pinakini in Kannada and
Thenpennai in Tamil. It is also referred as Ponnaiyar .
 The river is dry for the most part of the year. Water flows during the
monsoon season when it is fed by the south-west monsoon in catchment
area and the northeast monsoon in Tamil Nadu.

32. Conts…,
 The sand build of the river is quite impressive, suggesting that it may have
been a perennial river with much larger water flow in the past.
 Mention of the river is found in Sangam and medieval literature.
 There are various temples on its banks.

33. – (India WRIS project)

34.  It has a catchment area of 1,424 square miles located in Karnataka, Tamil
Nadu and Andhra Pradesh states.
 From its origin, the river generally flows in the Southern direction for a
length of 79 km, through Kolar and Bangalore districts of Karnataka
before entering the Dharmapuri district of Tamil Nadu.
 The river flows another 247 Km generally in the South-Easterly direction
in the districts of Dharmapuri, Vellore, Tiruvannamalai, Villupuram and
Cuddalore, before it drains in Bay of Bengal.
 The river Ponnaiyar branches into two, the Gadilam and the Ponnaiyar
below the Tirukoyilur anicut.
 The Gadilam joins the near Cuddalore and the Ponnaiyar near the Union
Territory of Pondicherry, to Bay of Bengal.
IRRIGATION

35. Conts…,
 The Krishnagiri dam(Capacity 2.5 TMC) & Sathanur Dam(Capacity 10.8
TMC) are also built across this river.
 The net irrigated area under Ponniyar basin in tamilnadu of about 7.2 lakh
ha.
 Of which the major crop of this basin are Paddy (2.7 lakh ha), Groundnut
(1.3 lakh ha) Sugarcane (0.7 lakh ha), Ragi (1.2 lakh ha). Other crop such
as Bajra, Black gram, Horse gram, Mango, and Cashewnut.
- (Rajkumar et al.,2011)

36. Krishnagiri Dam

37. Sathanur Dam

38. VAIGAI RIVER
 The Vaigai is a river in Madurai, Tamil Nadu state of southern India.
 It originates in Varusanadu hills, the Periyar Plateau of the Western Ghats
range, and flows northeast through the Kambam Valley, which lies
between the Palani Hills to the north and the Varushanad Hills to the
south.
 The Vattaparai Falls are located on this river. As it rounds the eastern
corner of the Varushanad Hills, the river turns southeast, running through
the region of Madurai and sivagangai.
 The river empties into the Palk Strait in Ramanathapuram District.

39. - (India WRIS project)

40. The Vaigai is 258 kilometres long, with a drainage basin 7,031
square kilometres large.
The Vaigai river rises on the Eastern slopes of the Varushanadu
hills at an elevation on 1,200 m above MSL near Kottaimalai in
the Madurai district.
It flow through Madurai, Sivagangai and Ramanathapuram
districts.
After traversing for about 258 Km, the river Vaigai discharges
into Bay of Bengal in Ramnad.
On its way, the Vaigai receives two important tributaries namely,
the Suruliyar and the Manjalar.
IRRIGATION

41.  Vaigai dam with a capacity of 6.14 TMC, was built across the river.
 The net irrigated area under Vaigai basin of about 3.8 lakh ha.
 It flows majorly in Madurai, Sivagangai and Ramanathapuram districts
of Tamilnadu. The Major crop of this basin are Paddy, Chillies,
Sugarcane, Gingelly and Bajra.
- (N.Ajjan et al.,2011)

42. Vaigai Dam

43. THAMIRABARANI RIVER
The Thamirabarani River (Porunai) is a perennial river, It flows through
Tirunelveli and Tuticorin districts of the Tamil Nadu state of southern
India.
The old Tamil name of the river is Porunai. The river is about 128
kilometres long and is the only perennial river in South India.
The Thamirabarani River originates from the peak of the Pothigai hills
on the eastern slopes of the Western Ghats at an elevation of 1,725 MSL.
 The river is joined by its tributaries Peyar, Ullar, Pambar before it flows
into the Kariyar reservoir.
Servalar joins the Thamirabarani before it enters into the Papanasam
lower reservoir.

45. IRRIGATION
 The many anicuts, dams and reservoirs on the Thamirabarani river, along with the
Manimuthar River, provide a large proportion of the water for irrigation and
power generation for Tirunelveli district.
 It is fed by both the monsoons – the south west and the north-eastern and is seen
in full spate.
 The Gadananathi River has 6 anicuts and irrigates 38.87 square kilometres of
wetlands.
 The Ramanadhi has 7 anicuts and irrigates 20.23 square kilometres of wetlands.
 Pachaiyar River has 12 anicuts and irrigates 61.51 square kilometres of wet and
dry lands.
 The net irrigated area under Thamirabarani river basin was about 2.4 lakh ha.
 The major crops of this basin is Paddy, Millets, Groundnut, Cotton, Sugarcane,
Fruit Crops, Vegetables, Plantation crops and Species
- (N.Ajjan et al.,2011)

46. Papanasam Dam

47. LIST OF MAJOR ANICUT ACROSS THAMIRABARANI
RIVER
 Kannadian anicut – irrigate 2,266.69 hectares (5,601.1 acres)
 Ariyanayagipuram anicut - irrigate 4,767.30 hectares (11,780.3 acres)
 Palavur anicut - irrigate 3,557.26 hectares (8,790.2 acres)
 Suthamalli anicut - irrigate 2,559.69 hectares (6,325.1 acres)
 Marudur anicut - irrigate 7,175.64 hectares (17,731.4 acres)
- (INDIA - WRIS Project)

48. WATER BUDGET FOR THAMIRABARANI
RIVER
 Meanwhile, Tamil Nadu has already taken up the inter-linking of
Tamirabarani, Karumeniyar and Nambiyar rivers in Tirunelveli and
Thoothukudi Districts.
 The budgetary allocation for the Water Resources Department in the
Revised Budget Estimates 2016-2017 is Rs.3,406.69 crores.
- (Budget speech – Tamilnadu 2016- 2017).

49. COMPARING TAMILNADU WITH THAMIRABARANI RIVER BASIN
- (Kalimuthu Senthilkumar, 2008)
Parameters Tamilnadu
Thamirabarani river basin
Tirunelveli district Thoothukudi district
Total geographical area (M. ha) 13 0.68 0.46
Agricultural area (%) 46 29 39
Agricultural area under
irrigation (%)
56 70 26
Agricultural area under rice
(%)
34 43 11
Land holding less than 2 ha
(%)
90 - 81
Average min and max
temperature(•C)
22.4 – 33.8 22.5 – 30.5 24 – 35.8
Mean annual rainfall (mm) 959 815 656

50. ADVANTAGES
Irrigation purposes
 This is the act of transporting water into large tracts of land for
agricultural purposes, particularly in areas that face severe drought.
 In Cauvery delta zone more than 14.47 lakh ha is benefited by river
cauvery. In this zone rice is a principle crop. In the rice based cropping
system, it is either single or double cropped.
 Pulses, black gram and green gram are next importance grown in the
rice fallows throughout the delta region from January.

51. Conts…,
 Canals are the major source of irrigation in Tamilnadu. As the system tanks
get supply from a permanent storage like reservoirs, dams etc. Canal
irrigation accounted for 26.4% the net area irrigated by all sources in the
state.
 The Total net area irrigated by canals in the state is highest in Thiruvarur
district with 150564 ha (19.9%) followed by Thanjavur district with
134554 ha (17.8%) and Nagapattinam district with 123696 ha (16.3%).

52. GENERATES ELECTRICITY
 Dams are usually built across rivers so that water can help in generating
hydro-electric power, which is either used domestically or for industrial
purposes.
 Asia's first hydroelectric plant (built in 1902), at Shivanasamudra the river
drops 98 meters (320 ft.) in Cauvery River, Karnataka and supplied power to
the city of Bangalore.
 Tamil Nadu has been a pioneer State in the field of hydro power
development in India.
 The State has the highest head hydro power plant in India and has developed
every type of hydro power schemes.

53.  Major sources of electricity in
Tamil Nadu are thermal power
plants, natural gas power plants,
diesel power plants, nuclear power
plant, wind mill power plants and
hydroelectric power plants.
S.NO CATEGORY OF
INSTALLATION
TOTAL
INSTALLED
CAPACITY (MW)
% CONTRIBUTION TO
TOTAL INSTALLED
CAPACITY
1 Thermal
i) Coal 11875.10 45.2
ii) Gas 1027.18 3.9
iii) Diesel 411.66 1.6
Sub – total (Thermal) 13313.94 50.6
2 Nuclear 986.50 3.8
3 Hydro (Renewable) 2212.20 8.4
4 RES (MNRE) 9777.30 37.2
Total 26282.94 100

54. HYDROELECTRIC POWER PLANTS IN TAMILNADU
S.NO NAME OF HYDRO POWER
SCHEME
NO OF UNITS ×
MW
INSTALLED
CAPACITY (MW)
16 Lower Mettur – IV 2×15 30
17 Mettur Dam 4×12.5 50
18 Mettur Tunnel 4×50 200
19 Moyar 3×12 36
20 Papanasam 4×8 32
21 Parson’s valley 1×30 30
22 Periyar 4×35 140
23 Pykara 3×7+2×13.6×1×11 59.20
24 Pykara ultimate 3×50 150
25 Sarkarpathy 1×30 30
26 Sholayar - I 2×35 70
27 Sholayar – II 1×25 25
28 Suruliyar 1×35 35
29 Kadamparai 4×100 400
Total 2212.2
S.NO NAME OF HYDRO POWER
SCHEME
NO OF UNITS ×
MW
INSTALLED
CAPACITY (MW)
1 Aliyar 1×60 60
2 Bhavani kattalai barrage - I 2×15 30
3 Bhavani kattalai barrage – II 2×15 30
4 Bhavani kattalai barrage – III 2×15 30
5 Kodayar - I 1×60 60
6 Kodayar – II 1×40 40
7 Kundah - I 3×20 60
8 Kundah – II 5×35 175
9 Kundah – III 3×60 180
10 Kundah – IV 2×50 100
11 Kundah – V 2×20 40
12 Kundah – VI 1×30 30
13 Lower Mettur - I 2×15 30
14 Lower Mettur – II 2×15 30
15 Lower Mettur - III 2×15 30

55. DOMESTIC PURPOSE
 Water from the river is mainly used for cooking, bathing and washing and
provides a steady supply of food to people, since people were consuming fish.
 Tamil Nadu is urbanizing rapidly. Consequently, the domestic water requirements
are projected to increase by more than 50 percent from 2222 MCM in 2001 to
3460 MCM in 2050.
 Water quality is also becoming a serious concern due to pollution by industrial
effluents, sewage, etc. and also due to naturally occurring phenomena.
 The Government of Tamil Nadu has indicated that water security, i.e. provision of
drinking water to the people will be the highest priority of the Government.

56. GREAT TOURIST ATTRACTION
Rivers with magnificent views make great tourist
attractions. In fact, almost all countries have river cruises
that allow tourist to enjoy the sounds and sights of the vast
land around them.
 In addition, this can help to create employment in form of
tour guides and waiters in beach resorts.
Tamil Nadu which lies in the tropical region is blessed
with a lot of natural places. The mix of natural and
cultural wealth makes the state a tourist haven.
In Thamirabrani river basin Papanasam and Agasthiyar
falls are some of the important tourist place.

57. Conts…,
Papanasam, Located around 60 kms from Tirunelveli. The famous
Papanasa Nathar temple dedicated to Lord Siva, is located at the foot
hill of the Western Ghats and also very near to the origin of River
Tamaraparani.
Agasthiyar Temple and Falls, This is 4 kms from Papanasam Sivan
temple, midway to Banatheertham, adjoining Agasthiar Falls. 3 km
trekking will lead the pilgrims to this temple.
 Likewise, In Bhavani river basin Kodiveri Falls and Sangameshwarar
Temple are some of the important tourist place.
PROVIDES FERTILE SOIL
The delta and flood plain that are formed by rivers provide fertile
soil, thus make the land suitable for cultivation. Moreover, this
encourages settlement when the deltas and flood plains are flat.

58. Crop output (₹ in crores) from (1991-92 to1993-94) – (2003-04 to 2005-06)
- (C.R.Ranganathan et al.,2011)
S.No Name of the basin Net Irrigared
area (in ha)
(average area)
1st Triennium
ending average
2nd Triennium
ending average
% change
1991-92 to 1993-94 2003-04 to 2005-06
1 Palar River Basin 500127 1855.76 3722.11 100.57
2 Ponnaiyaar River Basin 483752 2693.65 6941.13 157.68
3 Cauvery River Basin 1799856 6557.22 15026.05 129.15
4 Vaigai River Basin 258421 1027.28 1540.40 49.95
5 Thambaraparani River
Basin
172689 510.48 608.71 19.24

59. Net area irrigated input (Area in ha) from (1991-92 to1993-94) – (2003-04 to 2005-06)
- (C.R.Ranganathan et al.,2011)
S.No Name of the basin 1st Triennium ending
average
2nd Triennium
ending average
% change
1991-92 to 1993-94 2003-04 to 2005-06
1 Palar River Basin 607258 540136 -11.05
2 Ponnaiyaar River Basin 614772 548106 -10.84
3 Cauvery River Basin 2218516 2058522 -7.21
4 Vaigai River Basin 320771 274977 -14.28
5 Thambaraparani River
Basin
234047 201083 -14.08

60. CONCLUSION

61. DISCUSSION

62. THANK YOU