Mahanadi River System – UPSC

• The Mahanadi River system is the third largest of Peninsular India, after the Godavari and Krishna, and the largest river of Odisha.
  • The name joins two Sanskrit words: maha, “great”, and nadi, “river”.
• Among the east-flowing rivers it ranks second only to the Godavari in water potential and flood-producing capacity.

The Mahanadi River and Its Basin

Basin

• States: chiefly Chhattisgarh and Odisha, with smaller portions in Jharkhand, Maharashtra and Madhya Pradesh.
• Area: about 1.4 lakh sq km, more exactly 1,41,589 sq km, or 4.3% of India’s area. The 2019 Central Water Commission (CWC) assessment puts it at 1,44,905 sq km.
  • Older State figures give undivided Madhya Pradesh (now mostly Chhattisgarh) 75,136 sq km, Odisha 65,580, Jharkhand 635 and Maharashtra 238.
• Bounded by the Central India hills on the north, the Eastern Ghats on the south and east, and the Maikala range on the west.
• Physiography: four regions, namely the Northern Plateau, the Eastern Ghats, the Coastal Plain and the erosional plains of the Central Table Land.
• Soils: red and yellow, mixed red and black, laterite and deltaic.
• Land use: agricultural land covers 54.27% of the basin.
• Other streams: small streams between the Mahanadi and the Rushikulya that drain directly into Chilka Lake also count as part of the basin. There are six of them.
• Water: older average flow is about 67,000 million cubic metres. The 2019 CWC figure is 73 billion cubic metres.
• Silt: it is one of the most active silt-depositing streams in the Indian subcontinent.

Course

• Length: older accounts vary. The figure of 560 miles (900 km) overstates it, and 857 km is the common older value. CWC now gives 851 km.
• Source: the northern foothills of Dandakaranya, near Sihawa, at an elevation of 442 m.
  • Older accounts place this in Raipur District. It now lies in Dhamtari district of Chhattisgarh, at a pool 6 km from Farsiya village.
• Upper course: it runs north-east across the saucer-shaped Chhattisgarh Plain.
  • After receiving the Seonath, past Seorinarayan, it turns east and enters Odisha.
• Hirakud: at Sambalpur, the Hirakud Dam, one of the largest dams in India, has formed a man-made lake 35 miles (55 km) long.
  • Below the dam the river swings south, and it turns east again near Sonepur.
• Gorge: it crosses the Eastern Ghats through a narrow gorge of about 23 km, near Tikarpara. This stretch forms the Satkosia gorge.
• Delta: it leaves the hills at Naraj, some 11 km from Cuttack on its western side, and spreads over the Odisha plains.
  • It reaches the Bay of Bengal at False Point by several channels, with Paradip at one mouth.
  • This delta spreads across about 9,500 sq km, with a width of more than 150 km.
• Puri: older accounts place the pilgrimage centre at one of the mouths. Puri in fact stands on the coast at the southern edge of the delta, whose distributaries pass near it.

Tributaries

• The upper course lies in the Chhattisgarh Plain. Hills enclose this plain except to the east, so tributaries converge on the river from three sides.
• Left bank: the Seonath, the Hasdeo, the Mand and the Ib.
• Right bank: the Ong, the Tel and the Jonk.

Seonath

• It rises from Panabaras Hill (625 m) and flows north-east.
• It supports the people and industries of Durg District.
• Its total length is 345 km. It is also spelt the Sheonath.

Hasdeo

• It rises in Chhattisgarh and runs through Bilaspur and Korba Districts.
  • Older accounts describe it as flowing south of Chhattisgarh. Its course in fact runs south across northern Chhattisgarh to join the Mahanadi.
• It is 333 km long and drains 9,856 sq km.
• Rocky and hilly ground and thin forest line the river.

Mand

• A left-bank tributary, it joins at Chandrapur before the Mahanadi reaches Hirakud Dam.
• It is 241 km long and drains about 5,200 sq km.
• The Mand River dam stands in Raigarh district of Chhattisgarh.

Ib

• A left-bank tributary, it rises in the hills of Raigarh district in Chhattisgarh.
• It runs about 252 km and drains 12,447 sq km.
• The Ib river valley is known for its rich coal belt.

Ong

• A right-bank tributary, it flows across Odisha (Orissa) and drains about 5,128 sq km.
• It joins the Mahanadi about 11 km upstream of Sonepur, where the Tel merges. Older accounts name the confluence as Sambalpur, but this point lies well below that town.

Tel

• It rises in Nabarangpur district.
• It flows through Kalahandi, Balangir and Sonpur districts of Odisha.
• It is the second-largest river of Odisha.

The Delta Distributaries

Kathajodi River

• The Kathajodi is an arm of the Mahanadi in Odisha. It branches off at Naraj and divides almost at once.
  • The southern branch is the Kuakhai, meaning “Crow’s pool”, which flows into Puri district. A bar closes its mouth, so little water enters except in floods.
• A little below Cuttack the Kathajodi divides again. The right branch is the Sidhua, and the left keeps the name Kathajodi (Khatajodi).
• Cuttack City stands between the Mahanadi and the Kathajodi.
• Other distributaries include the Paika, Birupa, Chitrotpala (Chitroptala), Genguti and Lun.

Sukapaika River

• The Sukapaika is one of the distributaries of the Mahanadi in Odisha.
• Course: it leaves the parent river at Ayatpur village in Cuttack district and rejoins it lower down.
  • Older accounts give about 40 kilometres to Tarapur. The State’s 2021 affidavit gives 27.50 km to Bankala.
• It drains a tract of over 425 villages in three blocks of Cuttack: Cuttack Sadar, Raghunathpur and Nichintakoili.
• Flood role: it has been an important relief channel, taking floodwater and helping maintain flow towards the Bay of Bengal.
• Decline and revival: the river’s sudden barrenness has a known cause. Its mouth was closed in about 1950 for the Taladanda canal system and for flood protection.
  • The National Green Tribunal (2022) ordered it revived, with a new sluice near Ayatpur. In May 2025 the State reported the work as almost complete.

Chitrotpala River

• The Chitrotpala is a distributary of the Mahanadi in Odisha, lying in Kendrapara and Cuttack districts.

Development of the Basin

Important Cities

• On this small map, “Nepal” is misplaced. The land north-east of Cuttack is India: Odisha and then West Bengal. “Sambhalpur” is Sambalpur.

Projects on the Mahanadi River

• Pre-Plan period: the Mahanadi main canal and Tandula reservoir in Chhattisgarh.
• Plan period: Hirakud dam, the Mahanadi delta project, Hasdeo Bango and the Mahanadi Reservoir Project.
• Hirakud Dam: one of the first major multipurpose river valley projects taken up after Independence, near Sambalpur in Odisha.
  • Purpose: to control floods in the Mahanadi basin and provide irrigation and municipal water supply, along with power.
  • Size: the main dam is 4.8 km long and about 61 m high. With its earthen dykes the structure runs to 25.8 km, once the longest earth dam in the world.
  • Reservoir: 743 sq km at full level, against an older figure of 630 sq km. Gross storage is now given as 5,896 million cubic metres, against an older design figure of 8,100.
  • Dates and use: formally commissioned in 1957. It has an installed capacity of 307.5 MW and protects 9,500 sq km of delta from floods.
  • A new additional spillway is being built with World Bank support, after CWC raised the design flood in 1997 to 69,632 cumecs.
• Gangrel Dam: also called the R. S. Sagar Dam, across the Mahanadi in Dhamtari district of Chhattisgarh.
• Dhudhwa Dam: across the Mahanadi, also in Dhamtari district.
• Other canals: the Mahanadi canal system irrigates about 3 lakh hectares in Chhattisgarh. The delta canals, some 3,650 km long, irrigate about 4 lakh hectares in Cuttack and Puri.
• Hydropower: the basin’s assessed potential is 627 MW at 60% load factor.

Industry in the Mahanadi River Basin

• Urban centres: Raipur, Durg and Cuttack.
• The basin’s rich minerals and adequate power give it a favourable industrial climate.
• Main industries:
  • Iron and steel at Bhilai.
  • Aluminium at Hirakud and Korba.
  • Paper near Cuttack.
  • Cement at Sundargarh.
• Sugar and textile mills draw on farm produce.
• Mining of coal, iron and manganese is also important.

Floods in the Mahanadi River Basin

• The basin suffers severe occasional flooding in the delta, because the channels cannot carry the flood peak.
• The multipurpose Hirakud dam gives some relief by storing part of the floodwater.
• The problem persists, and a lasting solution is still needed.

The Water Dispute

• Parties: Odisha and Chhattisgarh. Odisha’s complaint of 19 November 2016 says upstream barrages cut lean-season flow into Hirakud.
• Tribunal: the Mahanadi Water Disputes Tribunal was constituted on 12 March 2018, after a Supreme Court direction.
• Status: its tenure now runs to 13 January 2027.
  • The two States are also trying a settlement, with Central Water Commission mediation opening on 29 July 2026.
  • Press reports say 15 of 46 framed issues are settled, leaving equitable apportionment and lean-season sharing unresolved.