1000 sq. km
2. KRISHNA RIVER SYSTEM
CATCHMENT AREA IN SQ.MILES
Name of the tributary
Origin , Altitude & Length
Name of the state
Westren ghats, 2,900 feet 176 miles
3. CAUVERY RIVER SYSTEM
Karaikkal region of Pondicherry
Catchment area in Sq.kms.
Pushpagiri Hills of Western ghats 1,067 metres 50 km
Ballarayana Durga in western Ghats, 1,219 metres, 245 km
Westren ghats in Kerala, 2,140 metres, 230 km
Taraka,Hebballa, Nugu, Gundal
Karnataka, Kerala & Tamiln Nadu
Nasrur ghat Range, Length 88 km.
Westren ghats, 1,950 metres, 131 km.
Tumkur district, 914 meters, 221 km.
Veeravaishnavi, kanihalla, chickkhole, Hebbahalla, Mullahalla & Kanva
Nandidurga 1,480 meters 161 km
Kumaudavat-hy, Manihalla & kuttehole, Vrishabhava-thy
Karnataka & Tamil Nadu
4. GODAVARI RIVER SYSTEM
The river Godavari rises in the Nasik district of Maharastra about 50 miles from the shore of Arabian sea, at an elevation of 3500 feet, after flowing for about 910 miles in a general south-easterly direction, through Maharastra and Andhra Pradesh, Godavari falls into the Bay of Bengal above Rajamundry. The Godavari has a drainage area of about 121,000 sq.miles.
NAME OF THE BASIN STATE
The principal tributaries of Godavari are the Pravara, the Purna, the Manjra, the Pranahita, the Indravathy and the Sabari. The brief description of Manjra River, having its partial catchment area in the State of Karnataka is given below.
Catchment area in Sq.miles.
Balaghat range of hills,
5. WEST FLOWING RIVER SYSTEM
The Western Ghats provides a principal geographical barrier in the path of the Arabian Sea branch of the Southwest monsoon, and is principally responsible for the heavy rainfall over the western coastal belt. The Southwest monsoon season (june to september) is the principal rainy season, over 90 % of annual rainfall is realised in this period.
The rivers in the Western Ghats region generally originate at an elevation ranging from 400 meters to 1,600 meters above the mean sea level, close to the Western Ghats ridge. The rivers generally flow westward and meet the Arabian Sea after a short run varying from 50 kms to 300 kms. the rivers are very steep in the upper reaches and fairly steep in the middle reaches. It is only near the sea that they have relatively flat gradients and some sort of flood plain.
The list of west flowing rivers, their important tributaries and the states through which these are flowing are given in the following table. There are a number of free catchments, between the identified river basins, which have small streams directly draining into the Arabian Sea. These free catchments are close to the sea and are at lower elevation.
Western ghats, Belgaum district, 600meters 87 kms.
Western ghats, Bidi village, 600 meters, 153 kms.
Pandhari, Tatti-halla and Nagi
Western ghats south Of Dharwad 700 meters, 152 kms.
Western ghats Near Sirsi, 500 meters 84 kms.
Westren ghats Humacha in Shimoga district, 700 meters, 122 kms.
East of Kodachadri in Shimoga district, 600 meters, 52 kms.
Kavaledur-ga in the Shimoga district, 600 meters, 66 kms
Bellarayan-a Durga in the Dakshina Kannada, 1,000 meters, 103 kms
Gundiahole, Kumaradara and Shisiahole.
Brahamagiri Ghat Reserve Forest in Coorg , 900 meters, 110 kms
Karnataka & Kerala
In addition to the above main river basins there are other independent catchment in the West Flowing River system, which are indicated as below.
There are numbers of independent streams joining the arabian seas. Kollur River, Ghantihole, Venkatapur, Baindurhole, Shankargundi, Kumbarhole and Yedamavinahole are the important streams in this reach. The entire catchment of the streams coming in this reach lies in the state of Karnataka.
b. Independent catchment between Varahi and Netravathi river.
The independent catchment comprises of streams namely Swarna, Seethanadhi, Mulki river, Pavanje, Nadisalu, Gurpur,Yennehole and Madisalhole. The entire catchment of the streams coming in this reach lies in the state of Karnataka.
c. Independent catchment between Netravathy and Chandragiri (Payaswani)
The main streams draining are Chandragiri ( payaswani) and Shiriya river. The Chandragiri rises west of Mercara in Coorg District of Karnataka State at an elevation of about 600 Mts. Pyayaswani River originates from Patti Ghats reserve forest in Coorg District of Karnataka at an elevation of 1350 Mts. The two river joins together at Machipana about 15 kms upstream of their out fall point into Arabian sea near Kasaragud. It drains catchment area of 1406 Sq kms out of which 836 Sqkms lies in Karnataka state and the balance portion in Kerala state.
6. NORTH PENNAR RIVER SYSTEM
Name of the tributary
Uttara Pinakini (North Pennar River )
Nandi hills of Kolar
Jayamangali, Kumadavath-y, Chitravathy and papagni
Karnataka, Andhra Pradesh
7. SOUTH PENNAR RIVER SYSTEM
Name of the tributary
Karnataka, Tamil Nadu
8. PALAR RIVER SYSTEM
Catchment area in Sq.kms
Talagavara village in Kolar, 900 meters , 348 kms.
Karnataka, Andhra Pradesh Tamil Nadu