Drainage System of India
TGPRB Constable / SI · 2–3 direct questions per paper. Learn the rivers on the map, then attach the facts - that is exactly how the exam asks them.
Current Affairs
How TGPRB tests this topic
Cover all six and you have everything TGPRB has ever asked about drainage here. Anything outside these six is context, not exam material.
The Map
This is your anchor. Rivers are spatial - that is how the exam tests them (tributary order, dam placement, which river ends where). Learn the shape first, then click a river to attach its PYQ-marked facts.
System Layout: Tributaries & Major River Basins (Wikimedia Commons / Public Domain)
Hierarchy at a glance
Indian Drainage System
├── Himalayan Rivers (perennial, glacier-fed)
│ ├── Indus → 5 tributaries (J C R B S, west→east)
│ │ Doabs: Sindh Sagar · Chaj · Rechna · Bari · Bist
│ ├── Ganga → Largest basin; delta = Sundarban
│ └── Brahmaputra → antecedent · Tsangpo→Dihang→Brahmaputra
└── Peninsular Rivers (seasonal, rain-fed)
├── East-flowing (deltas): God > Kri > Maha > Cau
├── West-flowing (estuaries): Narmada, Tapi (rift valleys)
└── Inland (no sea): Luni → Rann of KutchIntroduction
A drainage system is the network of rivers, streams, and lakes draining a particular area. India's drainage pattern is shaped by its geological structure, rock type, slope, and climate - making it one of the most diverse on Earth.
Why this topic matters for TGPRB
28 verified PYQs across Constable + SI papers (2015–2023). Expect 2–3 per paper. Top question types follow the coverage strip above: tributaries, dam–river–state, waterfalls, doabs and drainage termination.
8+
Godavari PYQs
5+
Narmada PYQs
4+
Krishna PYQs
Deep Dive
Read each system, then hit map to jump to it on the physical map - see the fact where it happens.
A. Himalayan Rivers perennial · glacier-fed
1 · Indus System
- Origin
- Near Lake Mansarovar, Tibet → Ladakh → Pakistan
- Length
- 2,880 km total · 709 km in India
5 tributaries, east → west - mnemonic S R B C J (see them on the map)
| River | Ancient name | Doab |
|---|---|---|
| Sutlej | Shatudri | Bist (with Beas) |
| Beas | Vipasha | Bari (with Ravi) |
| Ravi | IravatiPYQ | Rechna (with Chenab) |
| Chenab | Asikni | Chaj (with Jhelum) |
| Jhelum | Vitasta | Sindh Sagar (with Indus) |
PYQ alert
"Which river is known as Iravati?" → Ravi [Constable 2015]
2 · Ganga System
- Origin
- Gangotri Glacier (Bhagirathi) → meets Alaknanda at Devprayag
- Length
- 2,525 km · largest basin in India
- Delta
- Sundarban Delta - largest river delta in the world
Left bank
Ramganga · Gomti · Ghaghara · Gandak · Kosi · Mahananda
Right bank
Yamuna · Son · Damodar
3 · Brahmaputra System
- Origin
- Near Lake Mansarovar, Tibet
- Names
- Tsangpo (Tibet) → Dihang (Arunachal) → Brahmaputra (Assam)
- Key fact
- Antecedent river - older than the Himalayas, cuts through them
PYQ alert
"Brahmaputra is antecedent / called Tsangpo in Tibet" - direct assertion PYQ.
B. Peninsular East-Flowing Rivers deltas → Bay of Bengal
Mnemonic - by length
God KriMa Cau - Godavari (1,465) → Krishna (1,400) → Mahanadi (858) → Cauvery (800)
| River | Origin | Length | Key tributaries | States |
|---|---|---|---|---|
| Godavari | Nasik, MH | 1,465 km | Pranahita, Indravati, SabariPYQ, Manjira | 7PYQ |
| Krishna | Mahabaleshwar, WG | 1,400 km | Bhima, Tungabhadra, Musi | MH, KA, TS, AP |
| Mahanadi | Sihawa, CG | 858 km | Seonath, Hasdeo | CG, OR |
| Cauvery | Brahmagiri Hills, Coorg | 800 km | Hemavati, Kabini | KA, TN, KL |
PYQ traps on Godavari
Easternmost tributary → Sabari (NOT Indravati) - spot it on the map. States in catchment → 7 (MH, TS, AP, CG, MP, KA, OR).
C. West-Flowing Rivers Arabian Sea · rift valleys
Key rule
Narmada & Tapi flow through rift valleys - no deltas, they form estuaries instead. The map shows them squeezed between the Vindhya (N) and Satpura (S) ranges.
| River | Origin | Length | Key feature |
|---|---|---|---|
| Narmada | Amarkantak, MP | 1,312 km | Rift valley, Vindhyas (N) & Satpuras (S) - no deltaPYQ |
| Tapi | Multai, Betul, MP | 724 km | Rift valley, parallel to Narmada |
| Sabarmati | Aravalli Hills, RJ | 371 km | Gulf of Khambhat |
| Luni | Pushkar Valley, RJ | 495 km | Rann of Kutch - inland, never reaches the seaPYQ |
D. Dams & River Projects dam–river–state matching
| Dam / Project | River | State |
|---|---|---|
| Bhakra-Nangal | Sutlej | HP / Punjab |
| Sardar Sarovar | Narmada | Gujarat |
| Ukai PYQ | Tapi | Gujarat |
| Matatilla PYQ | Betwa | Uttar Pradesh |
| Hirakud | Mahanadi | Odisha |
| Tehri | Bhagirathi | Uttarakhand |
| Salal PYQ | Chenab | J&K |
| Sriram Sagar TS | Godavari | Telangana (Nizamabad) |
| Kaleshwaram TS | Godavari | Telangana |
| Lower Manair TS | Manair | Telangana (Karimnagar) |
| Kadam TS | Kadam | Telangana (Adilabad) |
| Jayakwadi | Godavari | Maharashtra |
PYQ trap - Salal Project
Salal → Chenab. The 2018 Prelims tested the Salal–Tapi pair as the WRONG option - see Salal in the far north on the map, nowhere near Tapi.
E. Waterfalls & Rivers
| Waterfall | River | Note |
|---|---|---|
| Jog (Gersoppa) | Sharavathi | Highest in India |
| Dhuandhar PYQ | Narmada | Also: Marble Falls |
| Kapildhara | Narmada | Near Amarkantak origin |
| Dudhsagar | Mandovi | Goa |
| Hogenakal | Cauvery | Tamil Nadu |
Data & Comparisons
Major rivers - quick reference
| River | Origin | Length | Drains into | Key fact |
|---|---|---|---|---|
| Ganga | Gangotri Glacier | 2,525 km | Bay of Bengal | Largest basin in India |
| Brahmaputra | Tibet (Mansarovar) | 2,900 km | Bay of Bengal | Antecedent · Tsangpo |
| Godavari | Nasik, MH | 1,465 km | Bay of Bengal | "Dakshin Ganga" · 7 states |
| Krishna | Mahabaleshwar | 1,400 km | Bay of Bengal | 2nd largest peninsular |
| Narmada | Amarkantak | 1,312 km | Arabian Sea | Rift valley · no delta |
| Tapi | Multai, Betul | 724 km | Arabian Sea | Parallel to Narmada |
| Cauvery | Brahmagiri Hills | 800 km | Bay of Bengal | Sacred river of South |
| Mahanadi | Sihawa, CG | 858 km | Bay of Bengal | Hirakud Dam |
| Luni | Pushkar Valley, RJ | 495 km | Rann of Kutch | Inland drainage only |
Doab reference
SI Prelims favourite| Doab | Between rivers |
|---|---|
| Bist | Beas - Sutlej |
| Bari | Beas - Ravi |
| Rechna | Ravi - Chenab |
| Chaj | Chenab - Jhelum |
| Sindh Sagar | Jhelum - Indus |
Mnemonic BiBarReChaJ → Bist, Bari, Rechna, Chaj, Jech - east to west
Memory Hacks
Mnemonics exist only for the parts the map can't carry - mostly east-to-west ordering. Spatial facts live on the map; these are the residual sequences.
Peninsular east-flowing rivers - by length
God KriMa Cau
Godavari (1,465 km) → Krishna (1,400 km) → Mahanadi (858 km) → Cauvery (800 km)
Indus tributaries - west to east
J C R B S
Jhelum · Chenab · Ravi · Beas · Sutlej
Doabs - east to west
BiBarReChaJ
Bist · Bari · Rechna · Chaj · Jech (Sindh Sagar)
Brahmaputra names across regions
T → D → B
Tsangpo (Tibet) → Dihang (Arunachal) → Brahmaputra (Assam)
The Tilted Table
Think of India like a tilted table: the Western Ghats are the high edge on the west. Pour water - most flows east to the Bay of Bengal. Narmada and Tapi found cracks in the table (rift valleys) and escaped westward. Rebel Luni just gives up halfway - on the map it is the dashed river that fades into the Rann of Kutch.
PYQs
Real TGPRB questions
All are from your extracted papers (2015–2023). Each card is tagged with the coverage pattern it tests - click an option to attempt, the reveal shows the trap.
Which of the following is the easternmost tributary of the Godavari river system?
The number of states at present which fall in the catchment area of the Godavari river:
Matatilla Project was built on which of the following rivers?
Ukai dam is situated across which of the following rivers?
Read the following statements: (a) River Narmada flows in a rift valley. (b) Vindhya mountains are located to the south of river Narmada. (c) River Narmada is a west flowing river. Which of the above statement/s is/are correct?
On which river is the “Rajoli Banda Diversion Scheme” built?
Arrange these west-flowing rivers from north to south: Mahi, Sabarmati, Tapi, Luni.
Which of the following is/are NOT tributaries of the Krishna river? (a) Panchganga (b) Malaprabha (c) Purna (d) Pravara
The Luni river, which originates in the Pushkar valley of the Aravalli range, ends in which of the following?
The Dhuandhar (Marble) Falls are a waterfall on which river?