Krishna River

The Krishna River is the principal east-flowing river of the Deccan plateau and, after the Godavari, the second-longest river of peninsular India, with a course of roughly 1,400 kilometres. It rises near the temple town of Mahabaleshwar in the Satara district of Maharashtra, at an elevation of about 1,337 metres on the eastern slopes of the Western Ghats, and discharges into the Bay of Bengal through a deltaic mouth in Andhra Pradesh. The river drains a basin of approximately 258,000 square kilometres, the fourth-largest in India, spread across Maharashtra, Karnataka, Telangana and Andhra Pradesh. As a rain-fed river dependent on the southwest monsoon, the Krishna exhibits pronounced seasonal flow variation, distinguishing it sharply from the Himalayan rivers that enjoy perennial glacial and snowmelt feed. Its basin lies almost entirely within the semi-arid rain-shadow zone east of the Ghats, a geographic fact that conditions both its hydrology and the intensity of competition over its waters.

The river's drainage follows the eastward tilt of the peninsular block, a structural feature shared by the Godavari, Kaveri and Mahanadi, all of which rise in the Western Ghats and traverse the plateau to reach the Bay of Bengal. After leaving Mahabaleshwar the Krishna flows generally southeast through Maharashtra into northern Karnataka, then turns to cross Telangana before entering Andhra Pradesh, where it forms a broad delta. The two largest tributaries are the Tungabhadra, itself formed by the confluence of the Tunga and Bhadra rivers in Karnataka, which joins the Krishna near Alampur; and the Bhima, which rises in the Bhimashankar hills of Maharashtra and meets the main stem near Raichur. Other significant tributaries include the Koyna, Ghataprabha, Malaprabha, Musi and Munneru. The river's deltaic distributaries fan out below Vijayawada, where the Prakasam Barrage anchors an extensive canal-irrigation network across the coastal districts of Krishna and Guntur.

The Krishna basin is among the most intensively dammed river systems in India. The Nagarjuna Sagar Dam, constructed across the river in the 1960s near the border of present-day Telangana and Andhra Pradesh, was for a time the world's largest masonry dam and remains a centrepiece of the basin's irrigation and hydropower infrastructure. Upstream, the Srisailam Dam generates hydroelectric power and feeds inter-basin transfers, while the Koyna Dam on the Koyna tributary supplies a major hydroelectric project in Maharashtra. The Almatti and Narayanpur dams in Karnataka, part of the Upper Krishna Project, and the Tungabhadra Dam at Hospet, complete a cascade of storage works that has rendered the river one of the most regulated in the subcontinent. These structures convert a monsoonal, flashy river into a managed irrigation resource, but they also concentrate the political stakes of every drop allocated across state lines.

The allocation of Krishna waters has generated one of India's longest-running inter-state disputes. The first Krishna Water Disputes Tribunal, constituted in 1969 under the Inter-State River Water Disputes Act of 1956 and chaired by Justice R. S. Bachawat, delivered its award in 1973, apportioning the dependable yield among Maharashtra, Karnataka and undivided Andhra Pradesh. A second tribunal under Justice Brijesh Kumar, established in 2004, issued its award in 2010 with later modifications. The bifurcation of Andhra Pradesh in 2014, which created Telangana under the Andhra Pradesh Reorganisation Act, reopened the question of sharing between the two successor states and produced fresh litigation before the Supreme Court and demands for a renewed tribunal reference. The Krishna River Management Board, a central body, now supervises the operation of major projects pending a durable settlement.

The Krishna should not be conflated with the Godavari, the larger peninsular river immediately to its north, with which it is frequently paired in examination geography; nor with the Kaveri to its south, whose own tribunal disputes between Karnataka and Tamil Nadu parallel but are legally distinct from the Krishna's. Unlike the Narmada and Tapi, which flow westward into the Arabian Sea through rift valleys, the Krishna is a true east-flowing peninsular river that builds a delta. The Polavaram project and various Godavari–Krishna link proposals have raised the prospect of inter-basin transfers that would further entangle the two systems, but the rivers remain hydrologically separate drainage units.

Recent developments centre on the unresolved Telangana–Andhra Pradesh apportionment and on the contested heightening of the Almatti Dam in Karnataka, which Maharashtra and downstream users argue alters dependable yields below the storage. Climate variability has sharpened these tensions: successive deficit-monsoon years have left Nagarjuna Sagar and Srisailam at critically low levels, forcing emergency allocation decisions and exposing the limits of awards calculated on historical flow assumptions. The Krishna Water Disputes Tribunal-II's terms of reference were the subject of a 2023 central notification expanding its mandate to include Telangana, a procedural step that practitioners follow closely because it determines which forum will settle the post-bifurcation share.

For the working practitioner and the civil-services aspirant, the Krishna illustrates the intersection of physical geography and federal water governance that defines India's river-basin politics. Its source at Mahabaleshwar, its Tungabhadra and Bhima tributaries, its Nagarjuna Sagar and Srisailam dams, and its tribunal history are recurring elements of the UPSC General Studies Paper I geography syllabus. More substantively, the river demonstrates how constitutional allocation of water to the states under Entry 17 of the State List, tempered by Parliament's power over inter-state rivers under Entry 56 of the Union List and Article 262, shapes a continuing negotiation among riparian governments whose stakes only intensify under conditions of scarcity.