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Rivers of Andhra Pradesh

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SwaPrep presents · A chapter in Geography

Rivers of Andhra Pradesh

From the gorges of the Eastern Ghats to the deltas of the Bay of Bengal, four great rivers carry the life of a state.

7 acts · 14 scenes · scroll to play↓

I

The Lifeblood

The lifeblood

Four rivers, one state, one sea

Rivers are the lifeblood of Andhra Pradesh: the Godavari, Krishna, Pennar and Vamsadhara systems together drain the entire state, feed its rice deltas, power its hydroelectric stations and sustain more than five crore people. Every one of them flows eastward into the Bay of Bengal. The Krishna's waters are almost fully allocated among its riparian states, while the Godavari still runs a surplus — which is why a single project that moves Godavari water to the Krishna's deficit has become the most important in AP. In 2015 the Pattiseema Lift Irrigation became India's first operational inter-basin river-linking scheme.

Marks-winning facts

  • All AP rivers flow east into the Bay of Bengal
  • Krishna — almost fully allocated; Godavari — still in surplus
  • Pattiseema Lift Irrigation (2015) — India's first operational inter-basin river link
  • The rivers sustain 5+ crore people and AP's rice deltas
The four systems

From the Godavari to the Nagavali

Four great systems and a handful of smaller rivers carve up the state. The Godavari, 1,465 km in all, runs about 775 km through AP and drains the East Godavari, West Godavari, Konaseema and Eluru districts. The Krishna, 1,400 km long, flows some 612 km in AP across the largest drainage area of any of them — roughly 76,252 square kilometres from Kurnool to NTR district. The Pennar covers 536 of its 597 km inside AP through Rayalaseema, while the Vamsadhara and Nagavali drain the far north-east around Srikakulam and Vizianagaram.

Marks-winning facts

  • Godavari — 1,465 km total, ~775 km in AP
  • Krishna — 1,400 km total, ~612 km in AP; largest AP drainage (~76,252 sq km)
  • Pennar — 597 km total, 536 km in AP (Rayalaseema)
  • Vamsadhara & Nagavali — drain Srikakulam / Vizianagaram in the north-east

II

Dakshin Ganga

The southern Ganga

The Dakshin Ganga enters the plains

The Godavari — revered as the Dakshin Ganga, the Ganga of the south — enters Andhra Pradesh near Bhadrachalam from Telangana and runs on to the Bay of Bengal. Between Bhadrachalam and Rajahmundry it cuts the dramatic Papikondalu gorge through the Eastern Ghats. As it nears the sea the river splits into two great distributaries, the Gautami Godavari to the north and the Vasishta Godavari to the south. Its main tributary inside AP is the Sabari, which joins near Kunavaram in the Alluri Sitharama Raju district.

Marks-winning facts

  • Enters AP near Bhadrachalam (from Telangana); the 'Dakshin Ganga'
  • Papikondalu gorge — through the Eastern Ghats, Bhadrachalam to Rajahmundry
  • Delta splits into Gautami Godavari (north) and Vasishta Godavari (south)
  • Tributary in AP: Sabari (joins near Kunavaram, ASR district)
The engineer's river

Cotton's barrage and the Coringa mangroves

The Godavari delta was tamed by an engineer's vision. At Rajahmundry stands the Sir Arthur Cotton Barrage, whose original anicut was raised in 1852 and whose present barrage was built between 1970 and 1982 to feed the delta canals. Where the river meets the sea lies the Coringa mangrove forest, the second largest in India. And at Pattiseema, the 2015 lift-irrigation scheme pumps Godavari water across into the Krishna — the first inter-basin link to operate in the country.

Marks-winning facts

  • Sir Arthur Cotton Barrage at Rajahmundry — anicut 1852, barrage 1970–82
  • Coringa — 2nd largest mangrove forest in India
  • Pattiseema Lift Irrigation (2015) links the Godavari to the Krishna

III

The Dammed Giant

The border river

The Krishna and the gravity dam at Srisailam

The Krishna enters AP as a border, dividing the state from Telangana for about 290 km from Srisailam down to Pulichintala. On it stands the Srisailam Dam, a gravity dam 143 metres high and 512 metres long, holding 216 TMC of water and housing India's second largest underground powerhouse. Its turbines generate around 770 megawatts. From here the Krishna turns fully into Andhra Pradesh on its way to the delta.

Marks-winning facts

  • Krishna forms the AP–Telangana border ~290 km (Srisailam to Pulichintala)
  • Srisailam Dam — gravity dam, 143 m high, 512 m long, 216 TMC
  • India's 2nd largest underground powerhouse — ~770 MW
The masonry colossus

Nagarjuna Sagar and the barrage at Vijayawada

Downstream waits Nagarjuna Sagar, built at Vijayapuri and completed in 1967 — at the time of its construction the largest masonry dam in the world, impounding 312 TMC. Closer to the coast the Prakasam Barrage at Vijayawada carries a road across the river and controls the Krishna delta canals, while the Pulichintala Dam, also called K.L. Rao Sagar, was finished in 2009 with a capacity of 45.77 TMC. The Krishna's major tributary, the Tungabhadra, joins it near Kurnool, its own dam shared with Karnataka.

Marks-winning facts

  • Nagarjuna Sagar (Vijayapuri) — 312 TMC, completed 1967; world's largest masonry dam at the time
  • Prakasam Barrage (Vijayawada) — road bridge; controls Krishna delta canals
  • Pulichintala / K.L. Rao Sagar — 45.77 TMC, completed 2009
  • Major tributary: Tungabhadra (joins near Kurnool)

IV

The Rayalaseema Lifeline

The seasonal river

The Pennar, lifeline of Rayalaseema

The Pennar, or Penna, is the great river of the parched Rayalaseema region, though it is semi-seasonal and dries up significantly through the summer. Its largest reservoir is the Somasila Dam, with a capacity of 75 TMC. The ambitious Telugu Ganga Project carries water by canal all the way from Srisailam to Chennai under an inter-state sharing agreement. The Pennar gathers in tributaries such as the Jayamangali, Kunderu, Sagileru, Cheyyeru, Chitravathi and Papagni.

Marks-winning facts

  • Pennar — lifeline of Rayalaseema; semi-seasonal
  • Somasila Dam — 75 TMC
  • Telugu Ganga Project — canal from Srisailam to Chennai
  • Tributaries: Jayamangali, Kunderu, Sagileru, Cheyyeru, Chitravathi, Papagni
The smaller streams

Four rivers off the beaten track

Beyond the giants run a clutch of smaller rivers, each with its own claim to fame. The Tungabhadra, 531 km long, is the Krishna's major tributary and feeds the Tungabhadra Dam near Kurnool. The Swarnamukhi flows near Tirupati through the Tirupati and Nellore districts, while the Gosthani threads through the Borra Caves in Visakhapatnam. The Sarada, running through Visakhapatnam and Anakapalli, supplies water to the city of Vizag.

Marks-winning facts

  • Tungabhadra — 531 km; major Krishna tributary; TB Dam
  • Swarnamukhi — flows near Tirupati (Tirupati, Nellore)
  • Gosthani — flows through the Borra Caves (Visakhapatnam)
  • Sarada — supplies Visakhapatnam's water

V

The Works of Water

The great dams

Ranked by the water they hold

Andhra Pradesh's dams line up in a clear order of capacity, and that order is the single most-tested fact in the chapter. Nagarjuna Sagar leads with 312 TMC, followed by Srisailam at 216 and the Tungabhadra Dam at 133, with Somasila on the Pennar holding 75 TMC. The Krishna carries the heaviest hardware — Srisailam, Nagarjuna Sagar, the Prakasam Barrage and Pulichintala — while the Godavari has the Sir Arthur Cotton Barrage and, rising now, Polavaram. Each was built to irrigate, to generate power, or to hold back floods.

Marks-winning facts

  • Capacity order: Nagarjuna Sagar 312 > Srisailam 216 > Tungabhadra 133 > Somasila 75 TMC
  • Krishna dams: Srisailam, Nagarjuna Sagar, Prakasam Barrage, Pulichintala
  • Godavari works: Sir Arthur Cotton Barrage; Polavaram (under construction)
  • Srisailam ~770 MW · Nagarjuna Sagar ~816 MW hydropower
Rivers turned to canals

The web that waters the fields

From these rivers spreads a web of canals that turns stored water into harvests. The Godavari and Krishna Delta systems irrigate the coastal districts of the two great rivers, while the Nagarjuna Sagar Left Canal carries Krishna water to Guntur and Prakasam. The Kurnool-Cuddapah Canal draws on the Tungabhadra for Rayalaseema, and the Telugu Ganga Canal sends Krishna water as far as Chennai. The longest of the modern lifts, the Handri-Neeva Sujala Sravanthi, pushes Krishna water across Kurnool, Anantapur, Kadapa and Nellore.

Marks-winning facts

  • Godavari & Krishna Delta systems — coastal irrigation
  • Nagarjuna Sagar Left Canal — Guntur, Prakasam (Krishna)
  • Kurnool-Cuddapah Canal — Tungabhadra, for Rayalaseema
  • Handri-Neeva Sujala Sravanthi — Krishna water to Kurnool, Anantapur, Kadapa, Nellore

VI

The Lifeline of AP

The lifeline

Polavaram, the lifeline of Andhra Pradesh

No project matters more to Andhra Pradesh than Polavaram, a multi-purpose dam rising on the Godavari near Polavaram village in Eluru district. The AP Reorganisation Act of 2014 granted it National Project status, and it is designed to irrigate 7.2 lakh acres across seven districts. It will bring drinking water to more than 540 villages and generate 960 megawatts of hydroelectric power. Above all it links the Godavari's surplus to the Krishna's deficit, which is why it is called the lifeline of the state.

Marks-winning facts

  • Polavaram — multi-purpose dam on the Godavari, Eluru district
  • National Project status under the AP Reorganisation Act, 2014
  • Irrigates 7.2 lakh acres in 7 districts; 540+ villages drinking water; 960 MW
  • Links Godavari surplus to Krishna deficit; ~194 TMC capacity

VII

Sharing the Waters

Sharing the waters

When rivers cross borders

Because these rivers rise in one state and empty in another, their waters are fought over in tribunals. The Krishna Water Disputes Tribunal divides the Krishna among Andhra Pradesh, Telangana, Karnataka and Maharashtra. The Godavari tribunal spreads its much wider basin across Andhra Pradesh, Telangana, Maharashtra, Madhya Pradesh, Karnataka and Odisha, while a separate Vamsadhara Tribunal settles claims between Andhra Pradesh and Odisha. Between the Krishna and Godavari deltas lies Kolleru Lake, a Ramsar wetland and a reminder of how closely these systems are bound together.

Marks-winning facts

  • KWDT (Krishna): AP, Telangana, Karnataka, Maharashtra
  • GWDT (Godavari): AP, Telangana, Maharashtra, MP, Karnataka, Odisha
  • Vamsadhara Tribunal: AP–Odisha
  • Kolleru Lake (Ramsar site) lies between the Krishna and Godavari deltas
The exam armoury

The matchings that win marks

APPSC examiners love this chapter because it is built on matchings. Memorise which dam sits on which river in which district, and the capacities in descending order: Nagarjuna Sagar 312, Srisailam 216, Tungabhadra 133, Somasila 75 TMC. Hold the Polavaram facts ready — national project, on the Godavari, in Eluru district, 7.2 lakh acres, 960 megawatts, 540 villages. And keep the two key barrages straight: the Arthur Cotton Barrage is on the Godavari at Rajahmundry, the Prakasam Barrage on the Krishna at Vijayawada.

Marks-winning facts

  • Dam–river–district matching is the most frequently tested item
  • TMC order: Nagarjuna Sagar 312 > Srisailam 216 > Tungabhadra 133 > Somasila 75
  • Polavaram: National project, Godavari, Eluru, 7.2 lakh acres, 960 MW, 540 villages
  • Arthur Cotton = Godavari / Rajahmundry; Prakasam = Krishna / Vijayawada
The traps

Mind which river the dam sits on

The classic trap in this chapter is the river behind the dam. Srisailam and Nagarjuna Sagar both stand on the Krishna, never on the Godavari, and a careless candidate will reverse them. Remember too that the Pattiseema Lift Irrigation was India's first operational inter-basin river link, commissioned in 2015, and that the Budameru rivulet caused the devastating Vijayawada floods of 2024. Read every option to the end before you mark it.

Marks-winning facts

  • Trap: Srisailam and Nagarjuna Sagar are on the KRISHNA, not the Godavari
  • Pattiseema (2015) — first operational inter-basin river link in India
  • Budameru rivulet — caused the 2024 Vijayawada floods

End of chapter

Now make it yours

The dam–river–district table is the single most-tested asset in this chapter. Open the full notes, then test yourself.

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