Rahuldeb Biswas
Environmental Activist & Researcher | Poribesh Dot Com

Abstract
The Ichhamati River, once a mighty watercourse, has now been reduced to a moribund canal primarily in its upper and middle courses. Although the river has not dried up entirely across its entire length, this research paper comprehensively investigates the actual causes behind the dying of these specific stretches through a longitudinal analysis of satellite imagery (1984–2025), riverine geomorphological behavior, and historical channel mapping. While public perception largely attributes this decline to the Farakka Barrage, this study reveals that the channel migration of the Ganga-Padma river system, geomorphological competition with the Churni River, and unregulated anthropogenic interventions are the primary drivers of this riverine disaster. Furthermore, the historical context of the Damodar River’s avulsion (shift in course) between the 15th and 18th centuries, along with the severance of the Ichhamati’s connection with the Bhairab and Jalangi rivers, played a crucial role in the demise of these rivers.

1. Introduction
The rivers of the Ganges Delta region are not static waterlines; they essentially behave as living entities. Over centuries, they have altered their courses and naturally assimilated their identities into other rivers. The Ichhamati River is one such vital hydrological artery of the Ganga-Padma delta. Although it appears as a narrow drain on Google Maps or contemporary satellite imagery, the numerous oxbow lakes scattered along its basin bear irrefutable testimony to its historical grandeur. Currently, the river is almost dead in its upper course and has completely lost its past glory in its middle course. On the other hand, the faint, thread-like stream barely surviving on the map, now choked with water hyacinth, was the mighty and fearsome Yamuna River of Bengal merely five hundred years ago. The primary objective of this paper is to deeply investigate the actual causes of the demise of these rivers in light of modern science, satellite data, and 250-year-old historical records and maps.

2. Identity in History and Literature
Evidence of the rivers’ past expansiveness is not confined merely to geography; it is equally prominent in literature. In the late 15th century (1495 CE), poet Bipradas Pipilai described the vastness of the Yamuna River near the Triveni confluence in his epic ‘Manasamangal,’ writing: “Ganga and Saraswati, Yamuna is immensely vast”. Similarly, in 1770 CE, during the Great Bengal Famine, the poet Vijayram Sen Bisharad of Bhajanghat village in Nadia, while introducing himself in his ‘Tirtha-Mangal’ poetry, wrote: “On the banks of the Nonaganj Ichhamati. A resident of Bhajanghat village…”. These literary artifacts prove that the name ‘Ichhamati’ had deep roots over 250 years ago, and people considered the settlements built along its banks as an integral part of their identity.

3. Tectonic Shift and the Fall of the Yamuna
Between the 12th and mid-16th centuries, a slow but highly significant tectonic shift or geomorphological transformation began in the Bengal Basin. Consequently, the gradient of the entire Ganges Delta gradually tilted towards the east. This geomorphological change had far-reaching impacts on the rivers:

  • Instead of flowing straight south past the Rajmahal Hills, the main discharge of the Ganges began flowing vigorously along the eastern gradient through the ‘Padma’ channel.
  • As the main Ganges flow shifted towards the Padma, the base flow or water volume of the Bhagirathi-Hooghly River decreased drastically.
  • Due to the reduced force of the current in the parent river, rapid siltation began at the origins of the Yamuna and Saraswati rivers emerging from Triveni. Consequently, these rivers gradually became disconnected from their original water source or the main flow of the Ganges.

4. Damodar’s Hydraulic Push and Shift
Even after the Ganges shifted to the Padma, the Yamuna River did not lose its existence immediately. Until the 16th century, the Yamuna retained its colossal form through the grace of the Damodar River. In ancient times, the Damodar flowed eastward past Bardhaman and coursed through the channels of the Behula and Kunti rivers, crashing straight into the Bhagirathi in the Kalna-Triveni region.

  • During the monsoons, this massive hydraulic pressure from the Damodar coming from the west would cross the Bhagirathi and enter directly into the Yamuna’s channel, which faced east, thereby keeping the Yamuna alive.
  • However, in the mid-18th century, particularly after the devastating floods of the 1762–1770 decade, the Damodar River abandoned its millennia-old eastward path near Jamalpur in Bardhaman and took a right-angle turn. Thereafter, it started flowing south towards the Mundeswari and Rupnarayan rivers.
  • With the Damodar shifting south, this hydraulic push at Triveni ceased overnight. As a result, rapid siltation at the source completely severed the Yamuna River from the Ganges, sealing its demise.

5. Rennell’s Map and Bhairab (The Primordial Mother of the Ichhamati)
In the famous ‘Bengal Atlas’ created by Major James Rennell, a surveyor of the East India Company, between 1764 and 1776, the line of a massive river piercing through Bongaon is distinct, yet the name ‘Ichhamati’ does not exist there.

  • An analysis of Rennell’s map reveals that the original mother of the present Ichhamati is not the Mathabhanga, but rather the mighty ‘Bhairab’ River.
  • During that period, the vast sweet water of the Ganges would flow south through the Jalangi into the Bhairab River. This Bhairab River bifurcated near Majhdia-Shibnibas, giving birth to the Kapotaksha and the present-day Ichhamati.
  • At that time, the original off-take of the Mathabhanga was merely a faint line emerging from the Ganges, and it was choking up with silt.
  • In the eyes of the British, this entire basin was identified as the dominion of the Bhairab, where the Ichhamati’s own name found no place.

6. Estuary Crisis: Ichhamati vs. Yamuna
Following Rennell’s map further south towards Charghat or Taki, it is observed that the wide Ichhamati merged with a very narrow Yamuna (Jubunah R.) river coming from the east. Surprisingly, the map shows that the wide Ichhamati lost its name and advanced towards the Bay of Bengal under the identity of the narrow Yamuna. For the East India Company, this Yamuna River was the principal navigational route from the Hooghly River to East Bengal. Due to this immense commercial significance, the massive Ichhamati lost its identity to the narrow Yamuna under the sheer weight of trade dynamics.

7. Farakka Barrage and Channel Migration
In contemporary geography, the Mathabhanga River originates from the Padma River near Mahishkundi village in the Kushtia district of Bangladesh. It subsequently bifurcates into two branches named Churni and Ichhamati at Pabakhali village in Majhdia, Nadia district, West Bengal.

  • Although public perception singularly blames the Farakka Barrage for the moribund state of the Ichhamati, the Churni—another river originating from the Mathabhanga—survives to this day. This irrefutably proves that Farakka is not the sole cause of the Ichhamati’s demise.
  • An analysis of 40 years of satellite data collected from 1984 to 2025 reveals that the main channel or trench of the Ganga and Padma has shifted repeatedly.
  • Due to this channel migration of the Padma, the off-take of the Mathabhanga has sometimes been directly connected with the powerful currents of the Padma, and at other times, entirely severed. This extreme hydrological uncertainty has severely impacted the water levels of both the Churni and Ichhamati.

8. Ichhamati vs. Churni: Geomorphological Competition
Comparing the origin points of both rivers, the Churni has been capable of drawing significantly more water than the Ichhamati. Behind this lies solid scientific rationale:

  • There is a significant disparity in the bed elevation of the Churni and Ichhamati; the Churni is deeper by approximately 14 feet(?). According to natural hydrological principles, water flows more readily along the comparatively easier and steeper gradient.
  • The course of the Churni River is relatively straight and simple, whereas the Ichhamati is highly meandering.
  • For the incoming water, flowing through the straight path of the Churni was hydraulically much easier than navigating the long, complex curves of the Ichhamati.

9. Field Reality and Human Intervention
Stepping out of history and science and looking at the ground reality reveals a tragic scene. Today, the origin of the Ichhamati at Pabakhali in Majhdia is completely dry.

  • The riverbed, choked with nearly 14 feet(?) of silt, is now cultivated with jute and sugarcane, and auto-rickshaws drive straight through its heart.
  • The local ‘Palda’ River, which once acted as a spill channel for the Jalangi River and was a major water supplier for this basin, has now turned into a half-dead wetland (beel).
  • As a man-made obstruction, the pillars of the Majhdia Railway Bridge have accelerated the rate of siltation, obstructing the natural flow of the Ichhamati.
  • Advancing from the source of the Ichhamati towards Swarupnagar, it becomes evident that vast stretches of the riverbanks and riverbed in its upper and middle courses have been extensively encroached upon.
  • The natural stream of the river has been completely suffocated by illegal constructions, unbridled agriculture, and pollution.

10. Conclusion
The drying up of the Ichhamati is not a single, isolated accident, nor is it solely the consequence of the Farakka Barrage. It is the story of the fall of a long-standing river empire in the Ganga-Padma delta. The death warrant of the Ichhamati was written on the very day its original connection with the Jalangi and Bhairab was severed and capillaries like the Palda dried up. Similarly, under the pincer attack of the Damodar’s course shift, the Yamuna River has today been reduced merely to a local canal fed by monsoon rains. To save these dying rivers, deep scientific surveys must be conducted starting from their origins, particularly targeting the critical zones in their upper and middle courses. Coordinated measures must be urgently undertaken to evict encroachments and restore the natural flow of the rivers.

11. Supplementary Note: Multimedia Documentation & Public Accessibility Traditional research papers often remain incomprehensible to the general public due to their heavy reliance on complex graphs, large data tables, and technical formatting. To bridge this gap and make this research accessible to all, we have provided the detailed information in our YouTube video documentary. In the video, we have comprehensively illustrated these findings using dynamic infographics, time-lapse satellite imagery, local oral history (public memories), and firsthand community statements.

References / Sources:

Historical Texts & Maps

  • Pipilai, Bipradas. Manasamangal (1495 CE).
  • Sen Bisharad, Vijayram. Tirtha-Mangal (1770 CE).
  • Rennell, Major James. A Bengal Atlas (1764–1776), Surveyed for the East India Company.

Geospatial & Satellite Data

  • Google Earth Pro Historical Imagery (1984–2025).
  • Landsat Satellite Archive (USGS / NASA).
  • Sentinel-2 Satellite Imagery (Copernicus Programme).
  • Google Maps Satellite Imagery.

Academic Literature & Official Records

  • Rudra, Kalyan. Rivers of Bengal.
  • Rudra, Kalyan. The Encroaching Ganges and Social Conflicts: The Farakka Barrage Issue.
  • West Bengal District Gazetteers (Nadia).
  • Irrigation & Waterways Department, Government of West Bengal.
  • River Research Institute, West Bengal.
  • Biswas, Rahuldeb. Field Observations & Geomorphological Analysis of the Ichhamati and Yamuna Basins (Poribesh dot com Documentary Data, 2026).

Youtube Video 1 –