India Currents, in collaboration with bioGraphic and the California Academy of Sciences, is publishing a 3 part series on Chennai’s relationship with water. To reduce flooding and bridge droughts, India’s southern coastal metropolis is using ancient knowledge, community action, and wetlands restoration to better harness its monsoon rains.
Half the story
From a minivan on the shoulder of Old Mahabalipuram Road on the south side of Chennai, hemmed in by honking trucks and autorickshaws, we watch a painted stork (Mycteria leucocephala) move with studied dignity through the long grasses of Pallikaranai Marsh. With each step, knee flexing toward the rear, the webbed foot closes, then spreads open again to find purchase on the soft land. As it tips toward a fish, striped white-and-black tail feathers spread, flashing a surprising red whoosh. Nearby an endangered spot-billed pelican (Pelecanus philippensis) swirls in for a landing, green-backed herons (Butorides striata) fish, and gray-headed swamphens (Porphyrio poliocephalus) tend to young among cattails and sedges—just a few of the 349 species of flora and fauna found here. We are watching from the vehicle because, with the traffic hurtling by, it’s not safe to get out. It’s a claustrophobic feeling—for myself, but more so for this delicate ecosystem. Just across the marsh, not far away, a network of power lines, buildings, and roads stretch beyond view.
In the last 50 years, this marsh has been literally decimated, losing 90 percent of its area to malls, restaurants, hotels, hospitals, and information technology firms. It’s part of a global problem. Over the past three centuries, 85 percent of the world’s marshes, sloughs, swamps, fens, and bogs have been drained, filled in, and built or planted upon. The relatively new IT corridor here is an echo of California’s Silicon Valley, where Google and Facebook squat on filled-in marsh. Over the past few decades, Chennai has sprawled into India’s fourth-largest city, from 48 square kilometers (18.5 square miles) in 1980 to more than 426 square kilometers (165 square miles) today.
And that development has not just harmed Pallikaranai Marsh. The natural landscape on which Chennai was built is particularly rich in water. Pallikaranai is linked hydrologically with a complex system of rivers, backwaters, coastal estuaries, mangrove forests, and ancient human-built lakes in a mosaic of movement—freshwater, brackish, salt—that once covered 186 square kilometers (72 square miles). But an assessment by a local NGO, Care Earth Trust, found that Chennai lost 62 percent of its wetlands between 1980 and 2010. That destruction has depleted habitat for wildlife and spawned dueling water problems for the people of Chennai.
In summer 2019, Chennai grabbed international headlines when it ran out of water. Government trucks made deliveries to roadside tanks, where people queued with vessels and occasionally brawled, resulting in at least one death. When I visited in mid-November, water trucks still plied the streets. But 2019 wasn’t an anomaly. Over the past two decades, Chennai has regularly run out of water during summer months. That’s because paved surfaces throughout the city prevent rain from being absorbed and replenishing groundwater that could be used during the dry season, says Balaji Narasimhan, a professor of engineering who specializes in hydrology at the Indian Institute of Technology Madras. The simple fact is, Chennai shouldn’t be running out of water at all. During its few months of monsoon, the city actually receives 1.5 times more rainfall than it consumes annually. But today’s water managers do their best to rush rain away in stormwater drains and canals, moving it rapidly out to sea. When they need water later, they turn to dwindling groundwater, distant supplies, and desalination plants.
During monsoon rains, water often floods vast swaths of the city. Among Chennai residents, more emotionally and politically jarring than routine water scarcity was the 2015 flood that killed at least 470 people, displaced hundreds of thousands, and left many stranded in their homes for weeks. Ironically, it was likely the local mindset of water scarcity that made the flood more deadly. As writer Krupa Ge documents in her book about the flood, Rivers Remember, reservoir managers were reluctant to release stored water ahead of the monsoon rains; when they finally recognized the threat, they discharged too much, too fast.
In addition to poorly planned development, climate change is also exacerbating these water swings. The city has seen increasingly frequent and intense cycles of both flooding and drought over the past two decades. As moderate rain fell early last December and streets began to flood, one local aptly captured Chennai’s dysfunctional relationship with water in a tweet: “till last week, the residents were booking water tankers and from today they will book rescue boats. What a city!”
These bifurcated water disasters are all the more tragic because early Tamil people, whose cultural and linguistic heritage continues proudly in today’s residents, developed an elegant system for capturing the precipitation that fell during monsoons, saving it for the dry season. Their method also replenished groundwater and minimized erosion from heavy rains. And it supported rather than devastated wetland habitats.
Back to the future?
Beneath the peepal (Ficus religiosa) and tamarind (Tamarindus indica) trees, amongst the flower stalls and idli restaurants, greater Chennai’s 11 million people go about their business as cows and dogs wander and nap at will, and jungle crows (Corvus culminatus), Oriental magpie-robins (Copsychus saularis), and dragonflies swirl above the fray. Chennai is more chill than the northern megalopolises Delhi and Mumbai, but it shares that quintessentially Indian sheen of chaos that, upon longer observation, reveals an innate order. An unspoken dialogue of push and pull among countless beings following their individual paths somehow manages to keep the whole in a constant state of flow.
Non-human lives, though, have less and less space to exist across India, where 1.4 billion—with a “b”—people jostle to survive and thrive in a land area one-third the size of the United States. Even so, solutions to this inherent tension don’t have to be an either/or. Reclaiming some of the ancient ways, restoring flow paths and space for water on the land, could provide greater water resiliency for humans and other organisms alike. Today a loose team of people in government, academia, and NGOs are working toward that vision.
The 2015 flood forced the city to acknowledge that poor development planning played a role in amplifying its water disasters. The Dutch office of International Water Affairs advised officials on flood recovery, underscoring that message. The following year, it offered them the opportunity to participate in a multi-year design and development program, called Water as Leverage, in partnership with local water experts and communities. Together they produced two reports that linked existing projects and laid out new ones that would conserve and restore natural and human-built water systems across the entire watershed. The aim was to harness nature, because protecting and restoring natural ecosystems and organisms is a way to also provide resources that people need.
This concept is part of a “slow water” movement that’s beginning to take hold around the world. Generally speaking, modern humans have forgotten that water’s true nature is to flex with the rhythms of the earth, expanding and retreating in an eternal dance upon the land. In our many attempts to control nature, we’ve sped up water, channeled it, and rushed it away. We’ve forgotten the fact that when we give water a chance to linger on the landscape, floods are softened, water is stored, and natural systems are sustained. Champions of the slow water movement think that the key to greater resilience, particularly in the face of climate change, is a kind of de-engineering that reclaims space for water to pause on land, supporting natural and human-made communities.
Although it may seem like an unimaginable challenge to restore space for water within a densely inhabited city, many experts think it’s possible. It requires thinking differently. Unlike standard gray infrastructure—dams, levees, stormwater tanks—slow water approaches typically involve many small projects scattered across a landscape that each absorb and hold some water. This dispersed approach is similar to the way that solar panels on every house can add up to a significant amount of electricity generation.
That any natural water arteries still remain in Chennai is thanks in significant part to Jayshree Vencatesan, a 50-something biologist who founded the NGO Care Earth Trust in 2001 to protect Pallikaranai Marsh and other bodies of water around Chennai. When she began, “people said it was the stupidest thing anyone could do,” she says. “But if people challenge me, saying you cannot do a bit of work, I will take it up.” Based on her years of accumulated knowledge, in 2014 Vencatesan documented the cascading system of 61 wetlands and ancient human-built water bodies across the watershed that drain into Pallikaranai and later juxtaposed them with time-series maps showing what’s been lost. Catalyzing public awareness, her findings were the basis for a ruling by the Honorable High Court of Madras to prohibit further encroachment on wetlands by development, and to implement a state plan to restore some of these ecosystems.
Vencatesan and Care Earth Trust have been heavily involved with the Dutch-local Water as Leverage initiative. Initially, she says, “the government was amused” by the groups’ presentations, given the officials’ general bias in favor of the more typical development approaches of desalination plants, dikes, and filling in wetlands to “reclaim” land. But “when they looked at the final proposal, they were taken by … the in-depth understanding about the city and its hydrology,” she says. This initiative, the court ruling, and other recent events have put the city on course for change. “Until now, nature has been treated in Chennai as an externality, never factored into urban planning.” As this revolutionary shift takes shape, she predicts that sand dunes, marshes and other wetlands, and remnant patches of dry forest will once again become “the natural buffers to the city’s shocks.”
To be continued next week…
Erica Gies is an independent journalist who covers science and the environment from Victoria, British Columbia, and San Francisco, California. Her work appears in the New York Times, Scientific American, Nature, Ensia, The Economist, bioGraphic, National Geographic, and other outlets.
Photographs by Dhritiman Mukherjee.
This story originally appeared in bioGraphic, an online magazine about nature and sustainability powered by the California Academy of Sciences.