Home Environment Ignored by Pakistan, the Indus delta is being lost to the sea

Ignored by Pakistan, the Indus delta is being lost to the sea

Ignored by Pakistan, the Indus delta is being lost to the sea
Floodplains covered by mangroves are fast disappearing [image by: Altaf Siyal]

Known as the vertebra of Pakistan’s ecology and economy, the Indus delta is the fifth largest in the world and home to the seventh biggest mangrove forest. In recognition of its international importance, the wetland was designated as a Ramsar site in 2002.

Zofeen Ebrahim

“What you don’t see, you cannot feel.” This phrase was used by Tanzeela Qambrani, Pakistan’s first lawmaker of African descent, to encapsulate the plight of the impoverished communities living in the once-flourishing Indus delta. Qambrani, whose Sheedi community is concentrated in the coastal regions of Makran in Balochistan province and Sindh, said the level of poverty is “incredible”.

Known as the vertebra of Pakistan’s ecology and economy, the Indus delta is the fifth largest in the world and home to the seventh biggest mangrove forest. In recognition of its international importance, the wetland was designated as a Ramsar site in 2002.

It forms where the mighty Indus River flows into the Arabian Sea, creating a complex system of swamps, streams and mangrove forests. A triangular piece of fertile land is created when the fast-flowing river deposits rich sediment as it empties into the sea.

However, dam construction and mismanagement of water by the government have significantly reduced river flows, causing the delta to shrink, and threatening both human life and its ecology. The absence of flowing freshwater allows seawater into the delta, destroying the soil and the aquifers, making it unfit for humans, animals or crops.

The Third Pole reported that around 1.2 million people from the delta have already migrated to Karachi.

For years, the communities in the delta have reported the loss of livelihood, an increase in disease and forced migration to cities which are already densely populated. “Almost everyone you know has tested positive for Hepatitis C,” said Qambrani.

There are acres of land where nothing can grow, and people are forced to remain only because they do not have the resources to migrate. To understand the extent of their despondency, she said, Pakistan’s Prime Minister Imran Khan must visit the delta himself.

Yet, despite pleas from the communities and compelling recommendations made by experts in a first-of-its-kind study published in 2018, not much has changed.

Scale of loss

The study made some startling revelations. Among the most shocking discoveries is evidence that, over the last two centuries, the delta has shrunk by 92%.

With the help of remote sensing and geospatial tools, the 15-month long study conducted by five university researchers found that nearly 60% of the tidal floodplain was barren, while 32% was under water. Satellite images revealed that from 16% in 1990, the floodplain covered by mangroves had been reduced to 10%. By 2017, even with the concerted efforts of the government and conservationists, it increased to just 13%.

Communities living in delta area
For years the disadvantaged communities living in the delta have been largely ignored [image by: Altaf Siyal]
Altaf Siyal, a professor at the Mehran University of Engineering and Technology (MUET) in Jamshoro which led the study, was its lead author. “When the delta was a flourishing ecosystem, it had 17 creeks,” he told thethirdpole.net. “Today, there are just two active ones left.”

The evidence pointed to the following reasons: decreased river flow to the delta resulted in reduced sediment deposits; surface and subsurface seawater intrusion;  land subsidence, sea level rise, climate change, and anthropogenic activities — all of which have contributed to the shrinkage and degradation of one of the largest ecosystems in the world.

A glacier fed system

As the glaciers of the Hindu Kush Himalayas —which make up 80% of the Indus flow — melt at a faster rate, there should be more water to sustain a sizable population in the short term, but in an increasingly unpredictable manner. However, detrimental policies and ill-informed projects have destroyed both the delta and the groundwater.

The findings mirror the experiences of the residents. Gulab Shah, who lives near the village of Kharo Chan in Thatta district, said his family has 6,500 acres of land that they want to sell and move to the city but there are no buyers. Even if he wanted to cultivate crops, he is unable to find farmhands as people have migrated from his village due to the acute shortage of drinking water. “It is giving me sleepless nights,” he said.

The study also found that 88.4% of the population of the delta lived below the poverty line, of which 31.4% were the “poorest of the poor”.

Economy over ecology

Many experts feel that taming the mighty Indus through dams and barrages was perhaps the biggest mistake.

Nasir Panhwar, an environmentalist and former coordinator for WWF’s Indus for All Program, said the reservoirs on the Indus and its tributaries were constructed to serve the needs of expanding agriculture as well as the subsequent industrial development. He said that today the delta is starved of sediment because economic priorities overruled the ecological consequences that will haunt us for years to come. He blamed the severe degradation of the delta on the upstream diversions of the river. “It is one of the worst examples of human interventions in nature.”

Another factor, he added, is the intricate system of canals, barrages and reservoirs which transferred supplies from the Indus, Jhelum and Chenab rivers to the areas formerly fed by the eastern rivers. This was done in order to compensate for water lost to India under the Indus Waters Treaty signed between India and Pakistan in September 1960, he said.

The irrigation system was developed in the British era to increase crop production, which turned the basin into a densely populated area. Extensive human interventions since then have led to adverse ecological consequences.

Siyal added that a series of dams were erected: the Warsak dam in 1965, followed by the Mangla dam in 1967, and the Tarbela from 1968-76.

He warned that construction of more dams might result in “no flow”, to the detriment of the delta. If electricity is needed, maybe run-of-the-river plants may be considered, as they do not obstruct water as much. Still, he emphasized that wind and solar are better options, especially when both the resources are found in abundance.

A blow to biodiversity

According to Siyal, deltas need to be kept alive as they are biologically the most “productive places” in the world, due to their rich biodiversity which provides shelter and a natural breeding ground to migratory birds and animals. In addition, he said they provide livelihood to millions of people both in and around the delta, especially those working in agriculture.

The construction of dams upstream, however, led to a decline in sediment which has translated to a massive loss in agriculture for the inhabitants of the Indus delta. Panwhar cited a 2019 World Bank study which noted that from an estimated 270 million tons per year at pre-development levels, the sediment that reaches the delta today is a mere 13 million tons.

Indus-river-delta-1400x786“Flow reductions have led to significant salinity in the delta, leading to a reduction in plant diversity.” He added that four out of eight plant species that thrived in the delta have disappeared in recent years.

In addition, the MUET’s United States-Pakistan Centre for Advanced Studies in Water which conducted the study found that up to 78% of the water available is unfit for either drinking or farming.

The groundwater is as bad, if not worse. Evidence showed that up to 94% of groundwater samples had chloride concentration higher than the safe limit.

“We even found arsenic beyond the permissible limit prescribed by the WHO in water samples collected from installed reverse osmosis (RO) plants,” said Ghulam Shabbir Solangi, a member of the research team that went by boat to collect samples of water and soil from the creeks.

Despite the significant degradation, Siyal said, the most imperiled part of Pakistan fails to draw public attention.

Poor understanding of Indus delta

There is little understanding among the public or policymakers about why the flow of the river is important for the sea. “The delta is considered a wasteland. The release of freshwater from the Indus is also termed ‘wastage’,” said Panhwar. “It is imperative to educate and sensitize everyone about the significance of the Indus delta.”

If the delta fails to get fresh water from the Indus, Siyal said it may die. He shared the example of central Asia’s Aral Sea which dramatically shrank because of the damming of the Syr Darya River upstream.


The report’s lead author said that for surface seawater intrusion, the construction of dykes and levees is very important. He added that this was among the demands of the local communities in the delta as it will provide them quick and easy access to the markets of Karachi.

Water resources expert, Hassan Abbas, however, said dykes interfere with tidal action necessary for mangrove forests and roads on dykes can block high floods from draining out to the sea, trapping the communities in un-drained floodplains for months to come.

“A coastal highway through the delta is a good idea as long as it does not interfere both with the tidal action as well as natural flood flows,” he concluded. The study recommended the expansion of the 38 kilometer coastal highways to up to 200 kilometers in length.

Some work had already started long before Siyal’s report. Qambrani pointed to the 87 kilometer Sindh Coastal Highway terming it a “good initiative” but added it would take a decade to complete.

Siyal further said there was field evidence that whenever levees were built in the delta, there was minimum surface seawater intrusion. He gave the example of the Netherlands, where levees have been built to protect seawater flooding.

Other recommendations included the promotion of bio saline agriculture; encouraging shrimp and crab farming in natural water bodies; imposing a ban on overgrazing and cutting of mangroves for wood; restoring dried up river channels like Ochito and Old Pinyari; ensuring water availability at the tail end of canals, such as Pinyari and Phuleli; and reviving saline lakes by adding freshwater.

But the most important thing, the study noted, is ensuring 8.6 million acre feet (MAF) of water flows annually below Kotri barrage as recommended by an international panel of experts.

Sadly, almost three years since the report was made public, none of the recommendations has been taken up by the government.

“We were approached by the Ministry of Planning Development and Special Initiatives a year back. They had seen our study and wanted to carry out a discussion with us on how to improve the delta conditions, but nothing concrete has happened based on the report so far,” said Bakhshal Lashari, Project Director at the USPCAS-W.

Lawmaker Qambrani had not read or heard about Siyal’s report. But as someone who hails from the coastal town of Badin, she was well aware of the issues of sea intrusion, waterlogging and salinity.

“We have been crying ourselves hoarse to bring this to the notice of the federal and provincial governments. If they do not take the plight of the delta seriously, the map of Pakistan will change in the coming 50 years, when all of the delta will be submerged in the Arabian Sea.”


Zofeen-Ibrahim-e1444375844809-2Zofeen was previously Pakistan editor at The Third Pole. She is an independent journalist based in Karachi.

Courtesy: The Third Pole