Canal Systems of Odisha

The Mahanadi Delta Canal System

The Mahanadi delta canal system is the oldest and most extensive canal network in Odisha, serving the coastal districts of Cuttack, Puri, Jagatsinghpur, Kendrapara, and Khordha. The system dates back to the 19th century when the British administration, recognising the need for improved navigation and irrigation in the fertile but flood-prone delta, constructed the Jobra Anicut (1865) across the Mahanadi at Cuttack and the canals radiating from it. The original design served the dual purpose of navigation and irrigation, reflecting the pre-railway era when waterways were the primary means of transporting goods and people across the delta.

The modern delta canal system, with the Naraj Barrage (completed later to replace and supplement the Jobra Anicut) at its head, consists of a complex network of main canals, branch canals, distributaries, and field channels totalling thousands of kilometres. The principal canals include the Taldanda Canal, the Machhagaon Canal, the Patamundai Canal, the Kendrapara Canal, and the Puri Main Canal. The Taldanda Canal and its branches irrigate the central delta and supply water to Bhubaneswar city. The Puri Main Canal traverses the southern delta and reaches the temple town of Puri, serving both irrigation and municipal water supply. The delta canal system is designed as a run-of-the-river (diversion) scheme without storage, dependent entirely on the regulated releases from Hirakud and the inflows from the unregulated catchment below the dam. During the monsoon, the canals often carry floodwater as the delta’s natural drainage is supplemented by canal flows, a unique aspect of the Mahanadi delta’s water management.

The Hirakud Canal System

The Hirakud dam releases water into three principal canal systems on the right and left banks of the Mahanadi in the Central Tablelands. The Bargarh Main Canal on the left bank is the largest, running for about 86 kilometres and serving the Bargarh plain — the “Rice Bowl of Odisha”. The Sason Main Canal on the right bank irrigates the Sambalpur and Bolangir tracts. The Sambalpur distributary serves areas closer to the dam. These are contour canals, constructed following the natural contours of the gently undulating terrain to maintain the gradient and minimise cutting and filling. The canals supply water through a hierarchical network of branches, distributaries, minors, and watercourses to the individual farm plots. The total command area of the Hirakud canals exceeds 2.5 lakh hectares, and the system has been operational for over six decades.

The Hirakud canals are gravity-flow systems that depend on the head available at the dam. Siltation in the reservoir and the canals themselves, unauthorised pumping from the canals, and the decay of the field-channel network in many areas have impaired the efficiency of water delivery. Tail-end farmers frequently complain of water not reaching their fields, while head-reach farmers use water liberally, a classic inequity of large canal systems. The introduction of Pani Panchayats (Water User Associations) in the Hirakud command area has been an attempt to address these management challenges by involving farmers in the distribution, operation, and maintenance of the canal network.

Other Canal Systems

Challenges and Modernisation

Odisha’s canal infrastructure, some of it over 150 years old, faces significant challenges. Physical deterioration — breaches, seepage, siltation, and weed growth — reduces conveyance efficiency, with water losses between the head and the tail often exceeding 40-50 per cent in older systems. Encroachment on canal banks and even within canals in some stretches disrupts flow and makes maintenance difficult. Inadequate field channels — in many command areas, the water reaches the minor or the outlet (mogha) but does not flow from there to individual fields because farmers have not been able to construct field channels due to cost and coordination challenges. Waterlogging and salinity in the coastal canal commands, where inadequate drainage accompanies irrigation, have degraded substantial areas of what was once prime agricultural land.

The State Government, with central assistance, has undertaken several canal modernisation programmes. These include the lining of canals (particularly in porous sandy stretches) to reduce seepage, the rehabilitation and remodelling of older canal structures, the installation of measuring devices at key points for volumetric allocation of water, and the construction of field channels as part of Command Area Development (CAD) programmes. The Odisha Integrated Irrigation Project for Climate Resilient Agriculture (OIIPCRA), supported by the World Bank, has the modernisation of select canal systems as a core component, with the objective of improving water use efficiency, strengthening the institutional capacity of Water User Associations, and introducing conjunctive use of surface and groundwater. The shift towards a more participatory, demand-driven irrigation management regime, combined with technological upgrades, represents the future trajectory for canal irrigation in Odisha.