Rebuilding Nal Sarovar's Water Regime Through Coordinated Action
Nal Sarovar spreads across more than 120 square kilometres of seasonal wetland, grassland, and open water on the outskirts of Ahmedabad in Gujarat. Recognised internationally as a Ramsar site in 2012, it forms one of the most important wintering grounds along the Central Asian Flyway, hosting hundreds of thousands of flamingos, pelicans, painted storks, and sarus cranes each year.
The wetland's annual rhythm of flooding and drying once shaped both the landscape and the livelihoods of surrounding villages. Over recent decades, a combination of upstream diversions, irrigation withdrawals, silt-laden inflows, and unregulated fish farming has disturbed the natural water cycle, leaving sections of the sanctuary either chronically flooded or parched at the wrong time of year.
Gujarat's Forest and Environment Department, working with the State Wetland Authority, the Central Water Commission, and several research partners, has begun a coordinated programme to readjust the water regime. The work combines engineering fixes with ecological restoration, hydrological monitoring, and structured community participation through the Joint Forest Management programme.
The challenges faced at Nal Sarovar echo those confronted in other wetland regions, including Australia. The Ramsar-listed floodplains of Kakadu National Park in the Northern Territory have struggled with altered flows caused by invasive species, salinity intrusion, and changing rainfall patterns, prompting parallel restoration experiments that Australian ecologists and Indian wetland managers now share.
The Hydrological Challenge at Nal Sarovar
The sanctuary depends on seasonal runoff from the Sabarmati and smaller tributaries, supplemented by treated releases from the Nalsarovar Dam. Until the late 1990s, this combination reliably filled the basin to a depth of one to two metres during the south-west monsoon, gradually receding through winter and producing the shallow, nutrient-rich margins that filter feeders depend on.
That pattern has unravelled. Upstream irrigation schemes now abstract much of the early monsoon flow. Silt from agricultural runoff has raised the bed of feeder channels by as much as a metre, reducing the volume of water that can move into the sanctuary at peak rainfall. Unregulated aquaculture bunds have fragmented the lake, blocking fish migration and trapping water in pools that grow increasingly saline as they evaporate.
The result is an unreliable water regime in which some sections remain dry for years while others sit too deep for wading birds. State forest surveys between 2018 and 2022 documented a steady decline in peak-season waterbird numbers, particularly among longer-legged species that require precise water depths. Similar declines have occurred at Australian Ramsar sites, where the federal Environment Protection and Biodiversity Conservation Act 1999 requires developers and water users to offset impacts on migratory shorebird habitat.
Engineering and Ecological Restoration Measures
The physical phase of restoration began in 2021 with a multi-year desilting operation on the four main feeder channels connecting the catchment to the central lake. Mechanical dredgers removed an estimated 1.4 million cubic metres of sediment over the first two seasons, restoring channel cross-section and allowing monsoon flows to spread across the full floodplain.
Hydrological engineers re-engineered the sluice gate on the Nalsarovar Dam to allow controlled releases timed with the lunar high tides that historically flushed the basin. New earthen bunds were raised along the eastern fringe to prevent saline intrusion from the Little Rann of Kutch, while unregulated bunds inside the sanctuary were removed to reconnect fragmented pools.
Ecological work has run in parallel. A team from the Wildlife Institute of India mapped vegetation cover and soil salinity across a 40-square-kilometre reference area to set restoration benchmarks. Native grass species, including Desmostachya bipinnata and Dichanthium annulatum, have been reintroduced on exposed islands to stabilise substrate and provide nesting cover. The approach mirrors water regime repair works at Brisbane's Boondall Wetlands, where tidal gate management has been combined with native sedge replanting to recover shorebird feeding habitat.
Community-Led Wetland Stewardship
Restoration at Nal Sarovar cannot be imposed from above. The sanctuary is bordered by more than 40 villages whose inhabitants have fished, grazed livestock, and cut reed from its margins for generations. A central plank of the recovery plan is therefore a structured community engagement framework that turns villagers into paid stewards of the wetland.
Through village-level wetland committees, residents participate in bird counts, monitor sluice gate operations, and report illegal fishing or bund construction. A modest honorarium is paid for survey days, and a share of the desilting contracts is reserved for local labour. Women from surrounding villages have been trained as wetland guides, leading visitors through designated birding trails during peak flamingo season.
This model draws on long-standing experience in joint forest management across Gujarat, set out in the Joint Forest Management programme. Comparable arrangements exist in Australia, where the Murray-Darling Basin Plan requires water holders to consult with local communities and Indigenous nations when allocating environmental water, and where restoration projects on the Murray floodplain rely on partnerships between catchment authorities, conservation groups, and Traditional Owners.
Waterbird Recovery and Migratory Connectivity
The biological objective of the work is straightforward: bring back the seasonal abundance that once made Nal Sarovar a draw for birdwatchers and researchers from across the world. Preliminary results from the 2023 and 2024 waterfowl censuses suggest the engineering work is paying off, with flamingo numbers at peak season recovering to within fifteen per cent of the long-term average.
Sarus cranes, which require shallow, well-vegetated margins for nesting, have reappeared in paddies adjacent to the sanctuary after several years of absence. Painted stork colonies, formerly threatened by colony collapse when water levels fluctuated unpredictably, have stabilised on the central islands. Early signals match those seen at the Western Port Ramsar site south-east of Melbourne, where managed environmental water releases have boosted red-necked avocet and chestnut teal populations.
Citizen science is woven into the monitoring effort. Indian birders working with the methodology of the Australian Waders Study Group conduct monthly counts at designated stations, contributing data to a regional flyway database.
| Indicator | Before Restoration (2018–2020) | After Initial Restoration (2023–2024) |
|---|---|---|
| Average monsoon water depth in main lake | 0.4 m | 1.1 m |
| Open water coverage at peak season | 38 km² | 76 km² |
| Peak-season salinity (parts per thousand) | 18–24 | 6–9 |
| Flamingo count at peak season | ~85,000 | ~165,000 |
| Village monitors trained and active | 0 | 312 |
| Feeder channels desilted | 0 of 4 | 4 of 4 |
Policy Coordination and Funding
Restoring a water regime of this scale requires sustained finance and clear institutional mandates. Funding for the Nal Sarovar programme has come from a combination of the Compensatory Afforestation Fund managed by the Gujarat Forest Department, central wetland mission grants under the National Plan for Conservation of Aquatic Ecosystems, and contributions from the state environment cell.
Coordination has been the harder challenge. Water management in India is split across multiple ministries and departments, from irrigation to fisheries, environment, and disaster management. At Nal Sarovar, the state has responded by establishing a multi-stakeholder Wetland Restoration Authority with representatives from each of these bodies, chaired by the Chief Wildlife Warden. The Authority approves seasonal release schedules, audits bund construction, and publishes annual hydrological reports.
The governance architecture parallels reforms under way in Australia, where the Murray-Darling Basin Authority oversees water allocation across four states and the Australian Capital Territory under a basin-wide plan. Both systems demonstrate that restoring a wetland's water regime is as much an institutional challenge as a technical one. Stable, well-funded authorities with the power to coordinate across competing water users are essential to keep restored flows intact.
Cross-Continental Lessons from Wetland Practice
The lessons emerging from Nal Sarovar resonate with practitioners working on wetland recovery across the Indo-Pacific. Both India and Australia face intensifying pressures on freshwater ecosystems from agricultural expansion, urban growth, and shifting rainfall patterns. Both have committed to the Ramsar Convention and both manage flyways used by the same species of migratory waterbirds.
Information exchange between the two countries is strengthening. Indian wetland scientists have visited Boondall and Western Port to study Australian experience with environmental water allocations, while Australian specialists have toured Nal Sarovar to observe sluice gate operations and community monitoring. The bilateral exchanges are shaping how each side plans future restoration cycles.
The shared experience highlights three principles that travel well across jurisdictions. Engineering works only when paired with ecological monitoring that tracks outcomes over decades. Community stewardship provides the on-the-ground vigilance that no agency can deliver alone. Governance structures must be empowered to make binding decisions across competing water users, or restored flows will gradually erode.
For visitors, volunteers, researchers, and policy partners interested in supporting the work, the Gujarat Forest Department invites participation through its wetland adoption programme, citizen science bird counts, and structured field visits. To learn more about ongoing restoration efforts and how to contribute, explore the state's wider portfolio of recovery work, including cheetah reintroduction in Kuno and similar landscape initiatives.