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he Cauvery basin extends over states of Tamil Nadu, TKarnataka, Kerala and Union Territory of Puducherry draining an area of 81,155 Sq.km which is nearly 2.7% of the total geographical area of the country with a maximum length and width of about 560 km and 245 km. It lies between 75°27’ to 79°54’ east longitudes and 10°9’ to 13°30’ north latitudes. It is bounded by the Western Ghats on the west, by the Eastern Ghats on the east and the south and by the ridges separating it from Krishna basin and Pennar basin on the north.
The Cauvery River is one of the major rivers of the peninsula. It rises at an elevation of 1,341 m at Talakaveri on the Brahmagiri range near Cherangala village of Symbol Elevation (m) Area (Sq. km) % of Total Area Symbol Rainfall (mm) Area (Sq. km) % of Total Area < 5 2058.03 2.54 600-800 24247.84 29.88 Kodagu district of Karnataka. The 5-10 1444.14 1.78 total length of the river from origin 10-50 4120.77 5.08 800-1000 32471.31 40.01 50-100 3297.20 4.06 1000-1200 9216.18 11.36 to outfall is 800 km. Its important 100-200 7202.59 8.88 tributaries joining from left are 200-300 8903.69 10.97 1200-1400 5664.54 6.98 the Harangi, the Hemavati, the 300-400 6957.78 8.57 1400-1600 2422.55 2.99 400-500 2837.79 3.50 1600-2000 3748.45 4.62 Shimsha and the Arkavati whereas = Operational Structures 500-750 12718.66 15.67 750-1000 25890.97 31.90 2000-2500 2408.66 2.96 the Lakshmantirtha, the Kabbani, GSC = Gross Storage Capacity (Original) 1000-1500 3938.50 4.85 2500-3000 748.84 0.92 the Suvarnavati, the Bhavani, the LSC = Live Storage Capacity (Original) 1500-2000 975.24 1.20 Noyil and the Amaravati joins from IC = Installed Capacity (Mega Watt) 2000-3000 809.63 1.00 3000-4000 226.64 0.28 PSS = Pumped Storage Schemes right. The river drains into the Bay of Bengal. Land Use / Land Cover (2005-06) Parliamentary Constituencies (2009) The major part of basin is covered Major Water Resources Projects of Cauvery Basin Nandyal with agricultural land accounting to Bellary Anantapur 66.21% of the total area and 4.09% Culturable Ultimate Haveri Nellore Command Irrigation Power Kadapa of the basin is covered by water Name of Project Associated Structures Type Status Area Potential (MW) Davanagere bodies. The basin spreads over (Th ha) (Th ha) 33 parliamentary constituencies Chitradurga Hindupur Harangi Project (KA) Harangi Dam Major Completed 54.82 53.54 9 Shimoga (2009) comprising 18 of Tamil Nadu, Tirupati Rajampet 11 of Karnataka, 3 of Kerala and 1 of Puducherry. Hemavathi Irr.Project (KA) Hemavathi Dam Major Ongoing 283.29 283.58 Chikkaballapura Krishnaraj Sagar Irr. Project Udupi Chikmagalur Krishnaraj Sagar Dam Major Completed 79.31 79.31 Tumkur Kolar Chittoor (KA) Bangalore North Tiruvallur Dr.D. Urs. Canal Irr. Project Hassan Krishnaraj Sagar Dam Major Completed 32.88 Bangalore South Bangalore Central Arakkonam (KA) Dakshina Kannada Vellore Bangalore Rural Krishnagiri Salient Features of Kabini Project (KA) Kabini Dam Major Completed 87.89 81.90 20 Mandya Kancheepuram Arani Cauvery Basin Tiruvannamalai Mettur Canal System (TN) Mettur Dam Major Completed 18.21 18.21 Mysore
Basin Extent Longitude 75° 27’ to 79° 54’ E Kannur Chamrajnagar Dharmapuri Cauvery-Mettur Irr. Project Viluppuram Latitude 10° 9’ to 13° 30’ N Mettur Dam Major Completed 130.55 130.55 240 (TN) Wayanad Length of Cauvery River (Km) 800 Vadakara Salem Kallakurichi
Kattlai Irr. Project (TN) Mettur Dam Major Completed 49.45 49.45 Nilgiris Tiruppur Cuddalore Catchment Area (Sq.km.) 81155 Kozhikode Namakkal Average Water Resource Potential Lower Bhavani Irr. Project 21358 Lower Bhavani Dam Major Completed 83.77 83.77 Malappuram Perambalur Chidambaram (MCM) (TN) Coimbatore Mayiladuthurai 16 Palakkad Erode Ponnani Puducherry Utilizable Surface Water Resource Kodivery Anicut System (TN) Lower Bhavani Dam Major Completed 19.83 19.83 19000 Nagappattinam (MCM) Alathur Karur Cauvery Delta Irr. Project Thrissur Pollachi Tiruchirappalli Thanjavur Live Storage Capacity of Completed Grand Anicut Major Completed 504.64 504.64 Dindigul 8597.2 (TN, PY) Projects (MCM) Chalakudy Lower Coleroon Anicut Symbol Category Area (Sq. km) % of Total Area Live Storage Capacity of Projects Lower Coleroon Anicut Major Completed 66.00 66.00 Ernakulam 269.82 System (TN) Built Up Land 3256.37 4.01 Madurai Shivaganga Under Construction (MCM) Idukki Theni Avalanche, Emerald, Agricultural 53736.30 66.21 Kottayam Total Live Storage Capacity of Kundha Palam, Alappuzha 8867.02 Forest 16636.66 20.50 Projects (MCM) Pegumbahallah Virudunagar Grassland 1075.80 1.33 No. of Hydrological Observation Kundah HE Complex (TN) Forebay, Pillur, Upper Major Completed - - 585 Pathanamthitta Ramanathapuram 34 Bhavani, Porithimond, Wasteland 3133.94 3.86 Tenkasi Cauvery Basin Stations Thoothukkudi Cauvery Basin Parson’s valley Dam & Waterbodies 3315.92 4.09 Mavelikkara No. of Flood Forecasting Stations 0 Nirallapallam Weir Kollam
C.38 *Th. ha = Thousand Hectare, MW = Mega Watt, MCM = Million Cubic Meter Attingal Tirunelveli C.39