Rivers of Andhra Pradesh

Subject: Geography | Unit: AP Geography | Topic: AP Rivers Exam: AP Group 2 (APPSC)

Introduction

Rivers are the lifeblood of Andhra Pradesh. The Godavari, Krishna, Pennar, and Vamsadhara systems together drain the entire state, feeding its rice deltas, powering hydroelectric stations, and sustaining 5+ crore people. AP's irrigation infrastructure — from the 19th-century Sir Arthur Cotton Barrage to the under-construction Polavaram project — is inseparable from its river systems. This is arguably the highest-yield AP geography topic for APPSC exams.

Context

All AP rivers flow eastward into the Bay of Bengal. The Krishna is almost fully allocated among riparian states, while the Godavari still has surplus water — making Polavaram (which links Godavari surplus to Krishna deficit) the single most important infrastructure project for AP. The Pattiseema Lift Irrigation, commissioned in 2015, was India's first operational inter-basin river linking project.

Core Content

Major Rivers of AP

Godavari in AP — "Dakshin Ganga"

• Enters AP near Bhadrachalam (from Telangana); exits at Bay of Bengal (East Godavari/Konaseema)
• Papikondalu gorge: Dramatic gorge through Eastern Ghats (Bhadrachalam to Rajahmundry)
• Sir Arthur Cotton Barrage: At Rajahmundry; original anicut 1852; current barrage 1970-82
• Coringa mangrove delta: 2nd largest mangrove in India
• Pattiseema Lift Irrigation: Links Godavari to Krishna (2015) — first inter-basin link operational in India
• Delta splits into Gautami Godavari (north) and Vasishta Godavari (south)
• Tributary in AP: Sabari (joins near Kunavaram, ASR district)

Krishna in AP

• Forms AP-Telangana border from Srisailam to Pulichintala (~290 km)
• Srisailam Dam: Gravity dam; 143m height, 512m length; 216 TMC; India's 2nd largest underground powerhouse
• Nagarjuna Sagar Dam: At Vijayapuri; 312 TMC; completed 1967; world's largest masonry dam at its time
• Prakasam Barrage: At Vijayawada; serves as road bridge; controls delta canals
• Pulichintala Dam (K.L. Rao Sagar): 45.77 TMC; completed 2009
• Major tributary: Tungabhadra (joins near Kurnool; TB Dam shared with Karnataka)

Pennar (Penna)

• Major river of Rayalaseema; semi-seasonal (dries up significantly in summer)
• Somasila Dam: Capacity 75 TMC
• Telugu Ganga Project: Canal from Srisailam to Chennai (inter-state water sharing)
• Tributaries: Jayamangali, Kunderu, Sagileru, Cheyyeru, Chitravathi, Papagni
• Pennar is the lifeline of Rayalaseema

Other Rivers

Major Dams and Projects

Polavaram Project — "Lifeline of AP"

• Multi-purpose irrigation project on Godavari near Polavaram village, Eluru district
• National Project status under AP Reorganisation Act 2014
• Designed to irrigate 7.2 lakh acres in 7 districts
• Drinking water to 540+ villages; 960 MW hydroelectric power
• Links Godavari surplus to Krishna deficit
• One of largest dam projects in India; under construction

Major Canal Systems

Inter-State Water Disputes

• KWDT (Krishna): AP, Telangana, Karnataka, Maharashtra
• GWDT (Godavari): AP, Telangana, Maharashtra, MP, Karnataka, Odisha
• Vamsadhara Tribunal: AP-Odisha

Key Points Summary

1. AP is drained by 4 major systems: Godavari, Krishna, Pennar, Vamsadhara — all flow east
2. Godavari = longest peninsular river; enters AP near Bhadrachalam
3. Sir Arthur Cotton Barrage at Rajahmundry on Godavari
4. Krishna flows ~612 km in AP; has Srisailam, Nagarjuna Sagar, Prakasam Barrage
5. Srisailam: India's 2nd largest underground powerhouse (770 MW)
6. Nagarjuna Sagar: world's largest masonry dam at time of construction (312 TMC)
7. Prakasam Barrage at Vijayawada controls Krishna delta canals
8. Pennar: 536 km in AP; lifeline of Rayalaseema; Somasila Dam (75 TMC)
9. Polavaram: "Lifeline of AP"; national project; irrigates 7.2 lakh acres
10. Pattiseema: first inter-basin river linking project operational in India (2015)
11. Telugu Ganga Canal: Krishna water from Srisailam to Chennai
12. Godavari delta: Coringa mangroves (2nd largest in India)
13. Kolleru Lake between Krishna and Godavari deltas (Ramsar site)
14. Krishna water almost fully allocated; Godavari has surplus
15. Budameru rivulet caused devastating Vijayawada floods (2024)

Exam Strategy

• Dam-river-district matching: Most frequently tested; memorize the table above
• Capacity in TMC: Nagarjuna Sagar (312) > Srisailam (216) > Tungabhadra (133) > Somasila (75)
• Polavaram facts: National project, Godavari, Eluru district, 7.2 lakh acres, 960 MW, 540 villages
• Key barrages: Arthur Cotton = Godavari/Rajahmundry; Prakasam = Krishna/Vijayawada
• Trick: Srisailam is on KRISHNA (not Godavari); Nagarjuna Sagar also on KRISHNA

Key Terms Glossary