Why in news?
Devotees gathered on both sides of the Kushiyara River for Durga idol immersion on 21 October 2026. The Times of India's report describes celebrations at Sribhumi in Assam and Zakiganj in Bangladesh's Sylhet district. Immersion marks the farewell to the goddess at the close of Durga Puja. Here, the same river carried ceremonies held within two countries. Kushiyara is a branch of the Barak River that forms part of the India–Bangladesh boundary before continuing through Bangladesh's drainage network. Its location makes it important not only to neighbouring communities, but also to irrigation and river transport. The immediate news is a cultural gathering along the border, not a newly signed water-sharing agreement or permission to cross it. The river's geography and the existing withdrawal arrangement explain the wider setting of that shared occasion.
Two banks, without assuming an open border
The newspaper identifies Kalibari Ghat in Sribhumi town and Customs Ghat in Zakiganj as the respective immersion locations. It describes crowds and celebrations visible across the river. That account establishes a shared occasion across a boundary, not movement of devotees from one country into the other. It also places the event within the wider Durga Puja celebrations of Assam's Barak Valley. A local cultural connection should not be confused with a change in the legal management of an international border.
How the Barak becomes two branches
A distributary is a channel that branches away from a river, unlike a tributary that joins it. The signed India–Bangladesh water memorandum identifies Amalshid, at the international border, as the Barak's division into the Surma and Kushiyara. Bangladesh's Joint Rivers Commission describes Surma as the north-western arm and Kushiyara as the south-western arm. Kushiyara follows a common border stretch before continuing into Bangladesh. This places the river in the southern Assam–Sylhet connection, not in the separate Brahmaputra channel farther north and west.
The surrounding hills and plains help explain the larger drainage relationship. Bangladesh's river commission describes connections with streams descending from the Mizoram and Tripura hills. It lists Longai and Singla from the Mizoram side, and Juri, Manu, Dhalai and Khowai from Tripura. These are basin connections, not a claim that every named stream meets the same short border reach. The water system extends beyond the line visible between two immersion ghats. Upstream catchments, connecting channels and downstream users are parts of the same geographical setting.
The route towards the Meghna and the sea
The downstream system changes names and divides through connected channels rather than remaining one simply named river throughout. Banglapedia describes the Bibiyana and Kalni reaches and a connection with the Dhanu, a Surma branch. The river commission summarises the combined Surma–Kushiyara network as becoming the Upper Meghna above Bhairab Bazar. Farther south, the Padma joins near Chandpur, and the Lower Meghna carries the combined waters towards the Bay of Bengal. Saying that Kushiyara ultimately drains into the Meghna is therefore useful shorthand, but it leaves out intermediate connections.
The choice of reach also matters when quoting a river's length. Banglapedia gives approximately 161 kilometres for Kushiyara, while the river commission describes a 281-kilometre border-to-Bhairab extent. Those figures should not be presented as measurements with unambiguously identical endpoints. The named channel and the longer connected downstream reach need to be identified before comparing them. The commission also calls Kushiyara perennial and meandering: it carries water throughout the year and follows a winding course. Perennial does not mean its discharge remains constant in every season.
What the 2022 memorandum permits
India's Ministry of Jal Shakti and Bangladesh's Ministry of Water Resources signed a Memorandum of Understanding in New Delhi on 6 September 2022. It permits withdrawal of up to 153 cusecs by each side from the common Kushiyara stretch during 1 November–31 May. The document describes Bangladesh's intended Upper Surma–Kushiyara irrigation project, covering about 5,000 hectares, and an intake channel called Rahimpur Khal. It also records India's intention to withdraw an equal amount. These are permitted withdrawals and project intentions, not proof that all irrigation works or benefits were completed.
The signed text provides for a joint team of engineers and other representatives to monitor actual dry-season withdrawals. It includes representatives of the two countries' border forces. The memorandum entered into force on signature, set a fifteen-year term and allows renewal or amendment by mutual agreement. It explicitly places this withdrawal understanding before a formal agreement on sharing the river's water. The document therefore should not be described as an allocation of the entire river, or as a new arrangement announced during the 2026 festival.
A flow allowance is not a fixed share of the whole river
A cusec is one cubic foot of water passing a point each second. It measures a rate of flow, not a stored quantity or an annual allocation. A rate of 153 cusecs is approximately 4.33 cubic metres per second. The total amount withdrawn depends on how long the withdrawal continues and at what rate. An upper limit does not establish that the full quantity is being taken continuously. Nor does the equal limit establish that the river itself is divided into two equal national shares.
India's Cabinet gave approval to the memorandum on 28 September 2022. Its announcement specifically identified Assam's ability to withdraw water and the proposed joint monitoring arrangement. The dry-season window is important: a river can carry water year-round while still facing competing demands when flows are lower. A permission to take water during specified months is not, by itself, a solution to monsoon flooding. Irrigation access, actual withdrawals, channel works and flood management are related issues, but they are not interchangeable outcomes.
One arrangement within a wider river relationship
The September 2022 bilateral joint statement linked the Kushiyara understanding with irrigation in Bangladesh and water projects in South Assam. The same statement separately discussed the Teesta, river pollution and navigability. It also referred to a 2019 Feni River memorandum for drinking-water supply to Sabroom in Tripura. These examples show why each river's instrument, purpose and permitted quantity must be read separately. Kushiyara should not be labelled the first bilateral water arrangement since 1996 by overlooking the intervening Feni understanding.
Transport adds another function to the river. A November 2022 Indian shipping-ministry release placed the Karimganj terminal on Kushiyara along an India–Bangladesh protocol route. It distinguished that facility from Badarpur on the Barak. Karimganj is the historical place-name used in that record; the current festival report uses Sribhumi. The older release also described joint river surveys and terminal works then under way. It establishes the navigation connection, not the completion of every project or a particular level of cargo traffic in October 2026.
Conclusion
The immersion gathering draws attention to a river that is both a political boundary and part of a connected regional landscape. Its branches link the Barak with the Meghna system, while its border stretch supports cultural, irrigation and transport uses. The practical distinction is between shared geography and the particular permissions agreed for using it. The festival does not alter the border, and the water memorandum does not divide or regulate every function of the river.