Narmada river

Geography glossary

Topic: Drainage System of India: Rivers, Basins and Patterns · NCERT: Class 11, Ch 2 "Structure and Physiography"; Class 11, Ch 3 "Drainage System"

Meaning

The Narmada is the largest west-flowing river of the Peninsula. It rises on the western side of the Amarkantak plateau (about 1,057 m) in Madhya Pradesh. It flows west for about 1,312 km through a rift valley (a valley made where land sank between two faults) between the Vindhyan Range to the north and the Satpura Range to the south. It ends in a 27 km long estuary south of Bharuch, Gujarat.

It matters for two reasons. It is the standard example of a rift-valley river that forms an estuary rather than a delta. Its big dams also raise key questions about water sharing between states and the displacement of people.

Explanation

Why it flows west, and how the rift valley shapes it

The Peninsula tilts east, but the Narmada flows west

  • The Peninsular plateau slopes gently towards the Bay of Bengal. So most big rivers (Mahanadi, Godavari, Krishna, Kaveri) flow east.
  • The Narmada does not follow that slope. It flows along a rift valley made by faulting (cracking of the Earth's crust).
  • Trough fault: the sunken block of land between two faults. The Narmada runs inside this block.

Rift valley → shape of the basin

  • Steep fault walls stand on both sides.
  • So most of its tributaries are short.
  • The basin is long and narrow, not fan-shaped.

Course and basin

  • Origin: western flank of the Amarkantak plateau, Madhya Pradesh, at about 1,057 m.
  • Course: flows west between the Vindhya (north) and the Satpura (south).
  • Length: about 1,312 km. Catchment: about 98,796 sq km.
  • Mouth: Arabian Sea (Gulf of Khambhat), south of Bharuch, Gujarat. The estuary is about 27 km long.
  • Basin states: Madhya Pradesh (most of the basin), plus Gujarat and Maharashtra [2].
  • Tributaries: the basin has about 41 important tributaries [2].
  • Left bank, from the Satpura side: Burhner, Banjar, Sher, Shakkar, Dudhi, Tawa, Ganjal, Chhota Tawa, Kundi, Goi, Karjan [2].
  • Right bank, from the Vindhyan side: Gaur, Hiran, Barna, Tindoni, Kolar, Chankeshwar, Kanar, Man, Uri, Orsang [2].

Marble Rocks and Dhuandhar Falls

  • At Bhedaghat, near Jabalpur (Madhya Pradesh), the river cuts a narrow, deep gorge (a valley with steep sides) through white marble. This place is called the Marble Rocks.
  • Here the river also drops about 30 m at the Dhuandhar Falls.
  • "Dhuandhar" means "smoke-mist". The falling water breaks into fine spray that looks like smoke.

Why it forms an estuary, not a delta

Estuary: a wide, open river mouth where tides mix river water with sea water. The sediment (sand and mud carried by the river) is washed away, so no new land builds up.

  • Cause: the river flows in a fault-made trough over hard rock, so it picks up little silt.
  • Process:
  • Its last stretch is short and steep. The water moves fast and does not drop its load.
  • Strong tides in the Gulf of Khambhat wash out (scour) the mouth twice a day.

  • Parts of the west coast are submerged (drowned by the sea), which leaves the mouth wide and open.

  • Result: an estuary, not a delta.

Where it occurs

  • Madhya Pradesh: the source at Amarkantak, the Marble Rocks and Dhuandhar Falls at Bhedaghat near Jabalpur, and the Indira Sagar dam. Most of the basin lies here.
  • Maharashtra: a basin state with a small share of the basin [2].
  • Gujarat: the Sardar Sarovar multipurpose dam, and the estuary south of Bharuch on the Gulf of Khambhat.
  • Rajasthan: it is not a basin state, but it gets Narmada water under the Narmada Water Disputes Tribunal award (1979).
  • Parallel river: the Tapi runs parallel to the Narmada to the south. The Satpura separates the two. The Tapi has its own rift valley and reaches the sea near Surat.

Don't confuse with

  • Tapi: also a west-flowing rift-valley river, but it is the second-largest. It rises at Multai, Betul (MP), flows between the Satpura and the Ajanta–Satmala hills, and reaches the sea near Surat. The Narmada flows between the Vindhya and the Satpura and reaches the sea near Bharuch.
  • Mahi and Sabarmati: they also flow west into the Gulf of Khambhat, but they are not rift-valley rivers.
  • East-flowing delta rivers (Mahanadi, Godavari, Krishna, Kaveri): they carry a lot of silt from soft alluvium and enter the weak-tide Bay of Bengal, so they build deltas. The Narmada builds an estuary.
  • Jog Falls: this waterfall is on the Sharavati in Karnataka (about 253 m). The Narmada's waterfall is Dhuandhar in Madhya Pradesh (about 30 m).

Prelims Hooks

  • Narmada: rises at Amarkantak (about 1,057 m) → reaches the sea south of Bharuch (27 km estuary). Length 1,312 km, basin 98,796 sq km. It is the largest west-flowing Peninsular river.
  • Rift valley position: Vindhya to the north, Satpura to the south. Trap: the Satpura is between the Narmada and the Tapi.
  • Dhuandhar Falls – Narmada – Madhya Pradesh (Bhedaghat, Jabalpur, marble gorge).
  • Narmada, Tapi and Mahi are the only three major Peninsular rivers that flow from east to west. Of these, only the Narmada and Tapi flow in rift valleys.
  • "The Narmada forms a delta" is a trap. It forms an estuary.
  • NWDT award (1979) shared the water among Gujarat, Madhya Pradesh, Maharashtra and Rajasthan. Rajasthan is not a basin state.

Mains Points

  • Why the Narmada forms an estuary (GS-I, east coast vs west coast landforms):
  • It flows along a trough fault over hard rock and carries little silt.
  • Its final course is short and steep, and the strong tides of the Gulf of Khambhat scour its mouth.

  • The result is an open estuary that suits ports (Bharuch) rather than delta farming.

  • Big dams on a rift-valley river (GS-III):

  • Benefits: irrigation, drinking water for drought-prone Saurashtra, Kachchh and Rajasthan, and power from Sardar Sarovar and Indira Sagar.
  • Costs: displacement of villagers, many of them tribal, whose land the reservoirs flooded. This gave rise to the Narmada Bachao Andolan.

  • Sharing the water between states needed an interstate tribunal (NWDT award, 1979).

  • Conservation: Madhya Pradesh's "Namami Devi Narmade" mission aims to keep the river clean and to plant trees along its banks. It shows how river health is being linked with protecting the catchment.

Related concepts

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Sources

  1. 1Class 11, Ch 2 "Structure and Physiography"; Class 11, Ch 3 "Drainage System" (primary)
  2. 2Central Water Commission, Narmada & Tapi Basin Organisation — About Basinscwc.gov.in · tier 1