Across large parts of India, agriculture is under growing pressure. Years of monocropping, intensive use of fertilizers and pesticides, and declining soil health have made farming increasingly difficult for many communities. In some of the country’s most vulnerable rural regions, farmers are now looking for new ways to restore both productivity and ecological balance.

One initiative addressing these challenges is the project “Agricultural Transition to Productive Biodiversity”, supported by the Dutch Government, Partners for Water programme and implemented by the Netherlands Enterprise Agency (RVO). The project focuses on nature-based solutions that help farmers restore soil health, reduce crop losses and strengthen biodiversity while maintaining livelihoods.

At the centre of the project is Meghna Mukherjee, Programme Manager at MetaMeta Research, a Wageningen-based consulting organisation specialising in water management, climate adaptation and agricultural development. Originally from India, Mukherjee has spent the past eight years working at the intersection of water management, agriculture and social inclusion. Her role combines programme management with a strong focus on gender and community engagement. “We work on practical solutions that can be implemented directly in the field,” she explains. “The aim is not only to test innovative approaches but also to understand how they can be scaled and adopted by communities themselves.”

A global research network

MetaMeta Research was founded in 2004 in Wageningen and has since expanded into an international organisation with offices in countries including Bangladesh, Indonesia, Ethiopia and Yemen. The company collaborates closely with governments, NGOs and local communities to develop water management and climate-resilient solutions. “What makes us unique is that we combine research with on-the-ground implementation,” Mukherjee says. In 2024, the organisation became part of the German development consultancy GOPA, expanding its international reach while maintaining its focus on water and climate solutions.

Water, gender and daily realities

One of Mukherjee’s core research interests is the relationship between water access and gender. In many parts of the world, women are responsible for collecting water for both household use and agriculture, often walking long distances under difficult conditions. But the issue goes beyond physical labour. “There are also social norms and power dynamics,” Mukherjee says. “Even when water is available nearby, women are still expected to collect it.”

These dynamics also appear in everyday tasks such as laundry, which is still largely performed manually by women in many regions. The water used can contain chemicals or contaminants that cause health problems, yet this aspect of hygiene rarely receives attention. Despite growing awareness, Mukherjee believes much work remains to be done. “In some cases, women’s voices are heard but not included in decision-making,” she says. “In others they are not even heard at all.”

Connecting institutions and communities

Addressing these challenges requires cooperation between many actors. One of the project’s key strategies is therefore to connect stakeholders that normally operate separately. “Different institutions often work in their own ‘boxes’,” Mukherjee explains. “Water departments, agricultural authorities and gender programmes rarely coordinate their activities.” The project aims to break these silos by encouraging dialogue between government agencies, local organisations and farming communities. “When these groups come together, they begin to understand the problems from different perspectives,” she says.

Another important element is evidence building. The project documents result and shares them with policymakers and development organisations through reports, social media and professional networks. “We try many different strategies,” Mukherjee says. “Sometimes you don’t know which one will work, but together they help create awareness.”

Three nature-based solutions

The project focuses on three main interventions that aim to improve agricultural productivity while strengthening biodiversity.

Reviving traditional hedges
The first intervention involves reintroducing hedges as green corridors along agricultural fields. “Hedges used to be a common feature in farming landscapes, both in India and in Europe,” Mukherjee explains. “But over time they disappeared as farmers tried to maximise cultivation areas.”

The project is now reviving this traditional practice by planting species such as pigeon pea and acacia along field boundaries. These hedges serve several functions. They protect crops from animals, improve soil stability and help retain water. They can also generate additional income when crops such as pigeon pea are harvested. Research has also shown that hedges influence the microclimate of agricultural fields. “We are observing temperature differences of up to 2.5 degrees Celsius between fields with and without hedges,” Mukherjee says.

Ecological rodent management
The second intervention addresses a problem that farmers often face but that rarely receives attention: crop losses caused by rodents. “Rodents are responsible for significant pre- and post-harvest losses,” Mukherjee says. “But people rarely talk about it.” Instead of using chemical rodenticides, the project promotes ecologically based rodent management (EBRM). Communities use techniques such as improved storage systems, hermetic bags and coordinated burrow control. The results have been striking. “In the last three months alone, more than 200 households have participated and over 90 rodent burrows have been closed,” she says. For many farmers, recognising the scale of the problem has been a revelation. “Some of them told us nobody had ever asked about rodents before.”

Water-efficient rice cultivation
The third intervention focuses on rice production through a method known as alternate wetting and drying. Traditionally, rice fields are kept continuously flooded. However, research shows that rice can grow well without standing water. The new method alternates irrigation with dry periods, reducing water use and improving soil conditions. “It requires a mind-set change for farmers,” Mukherjee says. “But once they see the results, many become interested.”

Working with farmers

The design of these interventions was strongly influenced by farmers themselves. For example, during discussions about hedges, farmers suggested the species best suited to local conditions. “They know the land much better than we do,” Mukherjee says. The adoption of alternate wetting and drying also began with a small group of inventive farmers. “In one village, two women farmers decided to try the new method,” she explains. “Their success encouraged others to follow.”

Building trust with communities took time. But partnerships with local organisations such as PRADAN and FES, which have long worked in the region, helped establish strong relationships. “At first there was some scepticism,” Mukherjee says. “If someone tells you that what you’ve been doing for years can be improved, you won’t immediately believe them.” Today, however, many farmers are sharing experiences with each other through WhatsApp groups and local networks. “It’s become much more organic,” she says.

Looking beyond pilot projects

The project currently operates in three Indian states – Jharkhand, Madhya Pradesh and West Bengal – covering several districts within what is known as the Central India Tribal Belt. These regions are home to many vulnerable communities and smallholder farmers. The next challenge is scaling up successful interventions beyond the pilot areas. “We now have strong evidence that these approaches work,” Mukherjee says. “The question is how to integrate them into larger programmes and policies.” This requires collaboration with government authorities, donor organisations and international partners. “We are already discussing these ideas with district agricultural departments and water authorities,” she says.

A long-term perspective

For Mukherjee, the most rewarding aspect of the project is seeing different groups come together. “My role is often to act as a bridge between the field teams and the donors,” she explains. “I help translate local realities into strategies and policies.” She works closely with a local team that plays a key role in implementing the project on the ground. Pratik Ranjan focuses on ecological rodent management (EBRM), Shubham Jain works on the restoration of hedges and Arpan Mondal supports the implementation of alternate wetting and drying in rice cultivation. Although each has specific responsibilities, they collaborate closely, discussing challenges together and carrying out activities as a team.

Although the project itself will eventually conclude, its impact may continue through the networks and knowledge it has created. Farmers are already sharing techniques with neighbouring communities, and manuals developed during the project can be adapted for other regions. “These solutions are simple and flexible,” Mukherjee says. “That means they can potentially be used in many different countries.”

In the end, the goal is not simply to complete a project, but to initiate a broader transformation. “There is still so much potential,” she says. “But what we are seeing now gives us hope that agriculture can become both productive and sustainable again.”

In western Kenya, the Nyando River catchment is caught in a cycle of flooding, land degradation and failing harvests. Trust 2 Impact, supported by Partners for Water, is working to break that cycle. Not by fixing isolated problems, but by addressing the system as a whole and ensuring that those who restore the land share in its benefits. Co-founder Victor Langenberg and Kenya Country Manager Professor Humphrey Oborah explain why that distinction matters.

Why fixing one thing is never enough

As a systems thinker and water expert, Victor Langenberg has spent four decades working on water systems in Africa. During that time, he has seen forests planted that never survived, water pumps that stopped working, and agro-programmes whose effects faded within five years. “When I travel through Africa, I see the remnants of projects where 80 percent has simply evaporated,” he says. “That is heartbreaking. ”

The reason, in his view, is structural. “Deforestation leads to soil degradation, soil degradation leads to flooding, flooding destroys harvests, destroyed harvests drive poverty, and poverty forces farmers to overuse the land,” he explains. “For lasting success, you cannot fix one part. You have to flip the system; step in together and turn that downward spiral into a cycle of restoration, resilience and opportunity.” That conviction is what led him to co-found Trust 2 Impact. “We aim to go about it completely differently.”

A view from the inside

Professor Humphrey Oborah brings a different but complementary perspective. Born and raised in the Nyando River catchment area, he knows this landscape from the inside. Four years ago, he joined as Trust 2 Impact’s Kenya Country Manager. “As a native of the region, I can speak with the community in their own dialect and align with their sufferings,” he says. “But I also wanted to bring my international connections and education in cultural and human science to find a lasting solution.”

Together with a dedicated team, they are now developing a long-term landscape restoration programme in the Nyando River catchment – combining agroforestry, water management and innovative financing to restore both ecosystems and livelihoods.

For background on the project and its wider context, see our earlier article Restoring Kenya’s Nyando River catchment: how Trust 2 Impact connects landscapes, livelihoods and long-term finance here.

Seeing the connections

To get to grips with what is happening in the Nyando catchment, Trust 2 Impact starts with maps. Causal loop diagramming is a systems thinking tool that charts how different factors influence and reinforce each other. It reveals where a well-placed intervention can trigger a chain of positive change. “We map the feedback loops between water, soil, agriculture, income and governance to find where small interventions can generate large effects,” explains Victor.

“When we looked at the Nyando River catchment systemically, deforestation, soil degradation, flooding, poverty and weak economic alternatives were all feeding into each other,” says Humphrey. “So instead of simply planting trees, we integrated landscape restoration with livelihoods, regenerative agriculture and local economic empowerment – because communities are more likely to protect ecosystems when restoration also improves their income and resilience.”

The knowledge is already there

Working closely with local communities is central to the programme. Victor is sometimes frustrated by the gap between knowledge and action. “The knowledge of how to work with the land – how to prepare seeds, read the landscape and the water, restore it – is there, but it’s hidden,” he says. “It needs to come out and be taken seriously. It’s often locked inside communities and academic papers, but there is no structure yet to connect it to financing and markets.”

Humphrey recognises the same pattern. “In many cases, communities already understood changes in rainfall patterns and soil fertility decline long before formal data confirmed it,” he says. “What was missing was a structured platform connecting that lived experience to financing mechanisms, restoration science, and economic opportunities.” Trust 2 Impact aims to do that.

This connects to a broader assumption Humphrey has consistently challenged: that communities resist change. “People are not resistant to change, they are resistant to exclusion from the benefits of change,” he says. Once communities see a credible pathway towards resilience and economic inclusion, their response shifts, and the numbers bear that out. Today, more than 20,000 community members are engaged in the programme – a strong foundation for the 60,000 hectares of agroforestry and riparian restoration the team aims to achieve across the Nyando catchment.

If it works here, what does it prove?

The Nyando catchment was chosen deliberately. It is one of the most degraded river systems on earth, but it also has high potential for recovery. “If we can fix the Nyando catchment area, we fix more than that,” Victor says. “Because what comes out of that river ends up in Lake Victoria. Improve the catchment and the whole lake system benefits, including the three countries surrounding it.”

“If this approach succeeds, it proves that climate restoration can simultaneously become an environmental solution, a poverty reduction strategy, and a green economic development model,” Humphrey says. “Carbon credit and climate finance projects work best when they are rooted in community ownership, systems thinking, and inclusive economic participation, not isolated technical interventions.”

A model worth repeating

Replication across the Lake Victoria basin would require long-term financing, local capacity-building and transparent governance. But above all, a shift in perspective. “Most importantly,” Humphrey concludes, “replication requires seeing ecosystems and communities not as separate issues, but as one interconnected living system. That is the real lesson emerging from Nyando.”

This is the second of a series of three articles. Read the first article and stay tuned for more in-depth insights.

Every year, dredging vessels pull some 3.6 million cubic metres of sediment from the waters around Barranquilla, where Colombia’s Magdalena River meets the Caribbean Sea. Almost all of it is currently discarded. An ambitious collaboration between the Netherlands and Colombia is working to change that.

The project was brought together under the Partners for Water programme and led by Arcadis in consortium with Colombian engineering firm JESyCA, Fundación Herencia Ambiental Caribe and Netics. The goal was straightforward: partner with Colombia to identify the building blocks to construct the legal and procedural foundation needed to put dredged material to beneficial and sustainable use. After a year of intensive work, the project formally closed with an event in Bogotá on 26 March 2026.

A resource hiding in plain sight

In Colombia, dredging is not optional. The country’s rivers carry enormous sediment loads, constantly depositing material in ports and navigational channels. The Magdalena River alone drains a vast Andean watershed. Without regular dredging, trade along these waterways effectively stops.

While dredging is routine, nothing useful is done with what is removed. “Currently, it’s disposed of,” says Pilar Vasquez, a biologist at Fundación Herencia Ambiental Caribe and one of the project’s lead researchers. Disposal follows a defined set of quality assessments and upon completion, the sediment is sent to designated sites.

It’s a significant waste. About half of the material typically dredged is either clean or sufficiently clean to reuse. Once dried, the sediment’s physical and chemical characteristics are similar to extracted raw material and sometimes even better, offering nutrients that can support nature restoration.

In the Netherlands, instead of importing clay, clayey dredging material is being used to reinforce sea dykes and to construct new islands, combining improving water quality and boosting biodiversity (Marker Wadden). In addition, compressed dredging material has been shaped into artificial reef elements that restore underwater habitats (GEOWALL). The shift in thinking is not complicated rather than asking where to dump dredged material, instead you can ask where can it go to do the most good.

Learning from ten countries

The first phase of the project looked closely at the Dutch experience. The Netherlands has spent decades refining its approach to dredging material with one principle standing out as particularly interesting. In the Netherlands, permissible contamination limits are set according to what the material will actually be used for and not just the sediment’s quality in isolation. “This is very important,” Pilar says. “It differs from many other countries, where limits are established, regardless of how you’re going to use the sediment.”

The team reviewed regulatory frameworks from ten jurisdictions, searching for examples that resembled Colombia’s tropical context. Dutch standards, developed for a small, temperate, geologically uniform country cannot always be directly applied. Colombia is something else entirely with enormous diversity in terms of geology, climate, ecology and living organisms. For example, what would apply for the Caribbean coast would not necessarily apply to the Pacific coast or the Amazon basin.

Two regions ultimately emerged as the best references: Florida (USA) and Brazil. Both are tropical regions that have developed their own use-based approaches to sediment. The Colombian Ministry of Environment’s plan is to take these two as a starting point, setting initial thresholds while continuing to gather local data to refine them over time.

A case study in Barranquilla

The next phase looked at what beneficial use could look like in practice in the Colombian context. The team focused on Barranquilla, capital of the Department of Atlántico situated at the mouth of the Magdalena river and one of Colombia’s most important maritime gateways.

The team carried out an assessment of the physical and chemical properties of dredged sediments alongside volumes and frequencies. These findings were fed into workshops with a broad group of stakeholders including: national ministries, local environmental authorities, ports, universities, military marine researchers and scientists from a national park just along the coast.

From this process, six conceptual designs emerged. Four addressed coastal erosion protection a real and urgent problem along the Department of Atlántico, where a combination of natural dynamics and impact of engineering works have disrupted natural sediment processes and left stretches of coastline exposed. The remaining two looked at soil enrichment and the production of construction materials.

Throughout the process, the project team emphasised that feasibility depends on context. “Distance is a key factor,” Pilar observes. “If the application site is too far from the dredging location, it simply isn’t economically viable. You have to look at it integrally incorporating the technical aspects, economic feasibility and community interests.”

A genuinely two-way exchange

The most important outcome of the project was not captured in five of the technical reports produced. It was this: knowledge exchange only works when it goes both ways.

“I want to really emphasise the two-way nature of this,” says Didi Gieling, Policy Officer at the Dutch Embassy in Bogotá. “From the beginning, I was genuinely impressed by the critical questions from all the counterparts, the scrutiny, the thinking-along.”

The collaboration between the Netherlands’ Government, Colombia’s Ministries of Environment and Transport and the National Department of Planning (DNP was formalised in a memorandum of understanding and has been running since 2017. This project, however brought the relationship to a different level.

Five training sessions were held over the course of the year, including two of them in Barranquilla. These brought together national policymakers, local experts, port operators and environmental authorities who deal with the Magdalena River every single day.

“One thing is sending a document,” Didi says. “Quite another is actually sitting down together and discussing it. Seeing what the interests are and which role other institutions need to play. Because you quickly realise it doesn’t stop at the ministries. So many other institutions have to come along for this to actually work.”

What comes next

The legal framework itself is still under development. The Ministry of Environment is preparing a decree that will lay the regulatory groundwork for reuse of dredging material, a process that is gaining traction and informed directly by the work the consortium has done. Full implementation on the ground will take time.

This year the Netherlands and Colombia mark 200 years of bilateral diplomatic relations and the project’s legacy is already taking shape with a new network of connections between Dutch and Colombian water professionals, researchers, ports, environmental institutions and businesses. As Colombia heads into presidential elections this June the network is built to last beyond government changes and will create opportunities for both Dutch expertise and Colombian industry alike.

Meanwhile, the sediment in the Magdalena River continues to move. The question is no longer whether Colombia can find a better use for it, but how quickly the country can build the systems to make that possible.

Please find here the project reports:

Final reports in English:
E1 – Key insights from the Netherlands on dredging (re)use approval [pdf]
E2 – Analysis Netherlands and other countries requirements for beneficial use of dredged sediments [pdf]
E3 – Assessment of the quality of dredged marine sediments in the port area of Barranquilla [pdf]
E4 – Procedural guidelines dredged marine sediments in Colombia [pdf]
E5 – Case study dredged sediments in Barranquilla [pdf]

Informes finales en español:
E1 – Información clave de los Países Bajos sobre (re)uso de sedimentos [pdf]
E2 – Análisis de requisitos de calidad uso sedimentos dragados en Países Bajos y otros países [pdf]
E3 – Evaluación de la calidad física y química de los sedimentos dragados en la zona portuaria de Barranquilla [pdf]
E4 – Directrices de procedimiento sedimentos marinos dragados en Colombia [pdf]
E5 – Estudio de caso aprovechamiento de sedimentos dragados en Barranquilla [pdf]

In Dalat, Vietnam, a Dutch–Vietnamese consortium led by Fresh Studio has completed a 30-month pilot to improve water management in greenhouse horticulture. Supported by Partners for Water, the project introduced drain water collection and UV disinfection to reduce nutrient losses. The results show savings of up to 40 percent for fertiliser and 35 percent lower water use for participating pepper growers. René van Rensen from Fresh Studio explains how the system works and what it takes to scale it.

In the highlands of Dalat, greenhouses stretch across the hillsides. Inside, vegetables are grown in substrate rather than soil – a method that offers higher yields and better control over water and nutrient supply. Yet beneath that efficiency, a hidden loss takes place. “When you grow in substrate, crops need 20 to 30 percent more water,” says Van Rensen. “Without a collection system, that excess water drains away and is lost.” In the Netherlands, this water is typically recirculated in closed systems.

For greenhouse growers in Vietnam, improving water management is not only about sustainability, but also about reducing input costs and securing long-term production. As fertiliser prices rise and water resources come under increasing pressure, practical solutions such as drain water reuse are becoming increasingly relevant.

To address this, the consortium – Fresh Studio, Ridder, Royal Brinkman and HollandDoor – introduced a closed-loop drain water system. By capturing, disinfecting and reusing drain water, the team aimed to improve water management while reducing both costs and environmental impact.

Turning drain water into a resource

In substrate systems, part of the irrigation water flows out of the pots as drain water. In the Netherlands, this water must be collected and reused by law. In Vietnam, this is not yet common practice. “The water just goes into the ground,” Van Rensen explains. “All the nutrients go with it. Eventually, they can end up in groundwater or surface water. This means that water is wasted and pollution occurs at the same time.” Simultaneously, water itself is rarely paid for. “If farmers need more water, they simply drill deeper,” he says. “Ten years ago, farmers would pump at 30 metres. Now they go down to 100 metres.”

The real incentive for reusing drain water lies elsewhere: “Fertilisers are one of the biggest cost components in horticulture,” Van Rensen notes. “In substrate-based greenhouse vegetable production, they can account for up to 40 percent of input costs.” Plants do not use all the nutrients in the fertiliser solution. By collecting and reusing nutrient-rich drain water, farmers can significantly reduce those costs. “That means they can recover their investment within two to three years.”

Proven results accelerate adoption

At first, growers were cautious. The full installation costs between 75,000 and 100,000 US dollars. “That is a serious investment,” Van Rensen acknowledges. “Farmers are understandably hesitant. Yet once the results became visible, interest grew more quickly.”

Encouraged by the results, both participating farmers expanded the area covered by the drain water collection system at their own expense. “During the project, this increased to full coverage on one farm (1 hectare) and to around 50 percent (1.5 hectares) on the other,” says Van Rensen. The grower with three hectares is continuing to expand the system, aiming for full coverage by 2027. “In Vietnam, farmers can be sceptical,” Van Rensen says. “But if they see something works, they often move fast.”

Beyond the greenhouse

The project also feeds into a broader discussion about water management in Dalat. Rapid greenhouse development has contributed to local flooding during heavy rainfall. “Greenhouses are sometimes seen as part of the problem,” Van Rensen says. “But they can also be part of the solution.” If each greenhouse were required to capture and store rainwater – an approach already widely applied in Dutch greenhouse horticulture – it could both reduce flood peaks and decrease groundwater extraction, he argues. The consortium is sharing these ideas with the Netherlands Embassy in order to explore possible policy dialogue. “Changes in regulation take time,” he says. “But projects like this show what is possible.”

Building trust for scaling up

For Van Rensen, one lesson stands out. “For solutions to be adopted by farmers, it is very important to demonstrate clear results,” he says. “A pilot site that farmers can visit is therefore very helpful.” Equally important, he emphasises, is local presence. “A strong local partner and a hands-on team are essential. Without people on the ground who understand the local context and can solve problems quickly, implementation will be difficult.”

Building on these experiences, the consortium now aims to see two to five additional growers adopt the system in the coming years. By combining Dutch water technology with local entrepreneurship, the project shows how improved water management can deliver both environmental and economic gains. As Van Rensen concludes: “If the results are clear and the system proves reliable, farmers will decide for themselves.”

Vietnam is one of the delta countries where Partners for Water works together with local partners to address water challenges. Are you working in Vietnam or interested in exploring opportunities there? Visit our Vietnam delta country page to learn more.

In western Kenya, the Nyando River catchment stretches from the highlands of Nandi County, down towards Lake Victoria. It is a landscape where farming, water and livelihoods are closely connected. However, flooding, land degradation and changing rainfall patterns have reduced arable land and are putting growing pressure on water and food security for many communities living within the catchment. Trust 2 Impact, supported by Partners for Water, aims to address these challenges through a systems approach combined with innovative financing models.

Working together with local communities, governments, knowledge institutions and partners, the initiative is developing a long-term programme for landscape restoration. Pilot activities are currently taking place in the Nyando River catchment, with a focus on agroforestry and riparian rehabilitation. We spoke with Ed Vermeulen, Managing Director of Trust 2 Impact and local community member Maurice Onyango to explore how the challenges are experienced on the ground and how Trust 2 Impact is working to address them.

Living in the middle of the catchment

Maurice is a small-scale farmer from the Awasi area in the Nyando River catchment. Like many others in his community, his livelihood depends directly on the land and on the river that runs through it. Located between the highlands upstream and Lake Victoria downstream, the area is increasingly affected by seasonal flooding. During periods of heavy rainfall, water from the upper catchment flows rapidly downstream. “We are in the middle,” Maurice explains, “when it rains in the mountains, the river breaks its banks and washes away homesteads, livestock and crops.”

Until a few years ago, farming could still provide some extra income. “With the continuous flooding, the size of the farm has been reduced,” Maurice says. “We used to sell produce. Now most people farm mainly for family survival.”

The effects of climate change also affect Lake Victoria itself. Invasive water hyacinth, thriving under current climate conditions, has taken over large parts of the shoreline. “It blocks fishermen and affects the fish we used to have,” Maurice shares. “We used to get big fish that could feed several homesteads. Today we get only very small ones.”

From ambition to action

Trust 2 Impact set out with the ambition to address the interconnected challenges of water and food systems across the wider Lake Victoria region, driven by the conviction that fragmented, short-term interventions are insufficient for complex, systemic problems. As the programme developed, however, the team realised that this broad scope was difficult to operationalise. “At first our scope was too wide,” says Ed. “All the investors believed in the aspiration, none of them believed such a scope was manageable from the start.”

As a result, Trust 2 Impact chose a clearly defined starting point: the rehabilitation of the Nyando River catchment. The programme is starting with pilot activities focused on agroforestry and riparian rehabilitation, aimed at restoring degraded land, reducing upstream flood risks and improving soil and water conditions. The ambition is to restore 60,000 hectares.

“In parallel, we are developing financing models that can support long-term investment in catchment restoration,” Ed adds. “We aim to bring different types of funders together in a way that safeguards the social purpose of the programme. The idea is that those who create value through ecosystem restoration benefit most, and that these models can be replicated as the approach scales to other regions.”

Working with complexity: applying a systemic approach

According to Ed, the challenges facing the Nyando River catchment are not isolated problems but interconnected systemic issues that need to be addressed at ecosystem scale. “When ecosystems are under pressure, communities become more vulnerable and resources start to run out. That is why you must address the root causes,” he says. “Our systems approach allows us to look at the rehabilitation of an entire ecosystem with all its complexity. But this requires moving beyond organisational silos.”

He adds that this type of collaboration does not always come naturally. “We are so used to working within the protective walls of our own silo,” he notes. “The entire approach is rooted in trusted collaborations, involving all levels of society, where partners work together on one shared mission and shared key performance indicators.”

Communities at the heart of value creation

“The community has received our programme with open arms,” says Ed. “They participate in all the meetings where we ask for their input.” This involvement reflects Trust 2 Impact’s approach, which places communities at the centre of the programme and views engagement as an ongoing, iterative process.

When Trust 2 Impact was first introduced in Awasi, the response from the people was hopeful. “The first thing that came to my mind was that help is on the way to stop the flooding,” Maurice recalls. “They gave us tree seedlings along the river and for agroforestry,” he explains. “They also gave us fruit seedlings, and agronomists showed us how to plant and take care of them.”

According to Maurice, this initial support is already making a difference. “The information and technical input we receive has helped put food on the table,” he says. “We can see better harvests.” For Trust 2 Impact, this link between restoration and shared benefit is fundamental. “In our regenerative enterprise, we are all shareholders,” Ed explains.

Success measured beyond numbers

In the end, success will be measured across social, environmental, economic and governance dimensions. “When communities can lift themselves out of poverty and ecosystem functions are restored, we know we are on the right path,” says Ed. For Maurice, success is tangible and immediate. “When flooding stops, the land that was lost to water can be reclaimed,” he says. “That means a larger area to farm, and an abundance of food.”

This is the first of a series of three articles. Stay tuned for more in-depth insights.

For centuries, batik has shaped the cultural identity and livelihoods of communities in Pekalongan, Indonesia. Yet today, the craft sits at the centre of one of the country’s most pressing water management challenges. With support from Partners for Water, Dutch and Indonesian partners are testing ways to make this heritage industry socially, environmentally and economically sustainable. Project leader Carrina Lim (The Water Agency) and technical lead Guido van Hofwegen (Resilience BV) share their ambition: building a model that batik makers can run themselves – and that can be scaled across Indonesia.

When the river turns black

In Pekalongan, the challenges are acute. Large volumes of untreated wastewater from dyeing processes, heavy use of chemicals, and extensive groundwater extraction are threatening the environment and livelihoods of the local communities.

“During parts of the year, the river literally turns black,” says Carrina. “It becomes too polluted to treat. The city can no longer use its own surface water.” With surface water unusable, batik workshops turn to groundwater. This accelerates water scarcity, land subsidence, salt intrusion and, eventually, the displacement of local communities, as the land becomes unliveable.

“The problem is not only environmental. It is also cultural and economic,” says Carrina. “Batik is part of our heritage, traditionally passed down from mothers to daughters over generations. Yet now the very practice is threatening the environment it depends on. Young people look at this sector and think: why stay? It feels like a doomsday scenario.”

The Green Batik Pekalongan pilot

The two-year Green Batik Pekalongan pilot aims to address the water pollution and availability challenges in Indonesia’s batik sector. It originated from work that Carrina and her team began in 2022, when they first explored Dutch and international solutions for Pekalongan’s wastewater challenges. “We realised quickly how sensitive the topic was,” she says. “You cannot parachute in with a solution – you need to understand the craft, the community, and the constraints first.” By engaging local entrepreneurs, universities, the government and residents, the team continued exploring both technical options and a new business model.

As the concept took shape, The Water Agency brought together a wider coalition to co-design the pilot. The Water Agency leads strategy and community engagement; Resilience BV oversees on-site engineering; Saxion University and Rietland contribute filtration and wetland expertise; and Universitas Pekalongan (UNIKAL) anchors the project locally as the future Green Batik Centre.

Building trust through collaboration

“When we first began discussing wastewater treatment with local producers, it wasn’t a welcome conversation,” Carrina recalls. “People know wastewater is an issue, but they don’t know where to start – and they fear the cost and the risk of changing.” Rather than pushing a problem narrative, the consortium reframed the challenge as an opportunity.

“We asked: what if the first ‘Green Batik’ comes from Pekalongan? Would you like to work with us on that?” Carrina explains. “That made people excited. It became a shared discussion, a shared journey. From that point on, we could begin talking about water as one of the obstacles standing in the way.”

“Currently we are working with four batik entrepreneurs,” Guido adds. “Eventually the pilot aims to work with ten.” These first four workshops – now known as Batik Champions – co-design, host testing and demonstrate the new systems. “They are deeply involved and genuinely collaborative,” he says. Carrina agrees: “This shift from compliance to ownership is essential. Our problems are also their problems. Our successes are also theirs. It’s the foundation of trust.”

Shells and air bubbles

At its core, the solution is deliberately simple. “We created a ‘wetland-in-a-tank’ concept using technical knowledge from our consortium partner Rietland,” Guido explains. “It functions like an artificial wetland, where bacteria living on the filter material break down the wax used in the dying process, dye residues and even faeces.”

Most components are locally sourced, reused waste products. “We fill second-hand tanks with waste seashells from restaurants,” Guido says. “They have a huge surface area for bacteria to live on.” With aeration from small pumps, the process becomes remarkably effective. According to Guido, the water is now around 90% cleaner than before treatment. “It goes from pitch black to almost transparent – cleaner than tea,” he says. “We’re still working on the final ten percent.”

“Ultimately, the goal is to make the system circular,” Carrina adds. “This way, the treated water could be reused in parts of the batik process, reducing groundwater use and closing the loop within each workshop”.

The team refines the system through trial and error. “Early on, insufficient oxygen supply caused the bacteria to die and clog the system,” Guido says. In another case, a workshop’s self-built masonry tank collapsed under its own weight. “The shells filled half the workspace,” Carrina recalls. Yet these setbacks strengthened cooperation. “Everything we do, we’re figuring out together with the entrepreneurs,” she says.

New opportunities

The project also invests in the next generation. Through a collaboration with the Dutch football association’s KNVB WorldCoaches programme, young people learn leadership and environmental awareness by linking sport to sustainable batik. “They learn responsibility – for themselves, for others and for their environment,” Carrina says.
The Dutch Embassy in Jakarta has further expanded opportunities through a Green Batik Design Challenge. “It shows that going green doesn’t only require extra effort,” Carrina explains. “It opens doors: new networks, new markets, new visibility. This is inspiring for local entrepreneurs.”

Looking ahead

The coming year will focus on technical refinement, cost optimisation and replication. The economic model is equally critical. “We are disrupting business-as-usual,” Carrina says. “Once we have a business model, we can begin talking to interested parties to scale up the solution.”

If successful, Pekalongan’s model could inspire sustainable batik production across Indonesia. For Guido, the clearest sign of success is market adoption: “If one workshop outside the project decides to buy the system, that’s when we know we’ve really achieved something.”

Salinity threatens agricultural productivity and water security worldwide. In response, the Dutch organisation The Salt Doctors, together with consortium partners Delphy and Plug ‘n’ Grow, is piloting a practical and scalable solution in Egypt’s Nile Delta. Supported by Partners for Water, the team has been testing low-cost hydroponic systems that allow farmers to grow crops even when soil and groundwater are too saline for traditional cultivation. Bas Bruning from The Salt Doctors shares the ins and outs of the ProSal-Hydro project.

A simple idea for a complex challenge

In Egypt’s Nile Delta, around 40% of farmland is severely affected by salinity. Rising sea levels, inefficient irrigation, and poor drainage is gradually turning soils more saline. “People directly affected by salinity are often small-scale farmers,” explains Bas Bruning, Saline Agriculture Specialist at The Salt Doctors. “They work on marginal land, often with poor soil quality and saline water. On top of that, they often have few resources to adapt. To accommodate them, we wanted to design something that is simple, robust and affordable.”

The project’s approach bypasses saline soils entirely: crops grow in nutrient-rich water rather than in the ground. “We developed an open hydroponic system that grows vegetables in floating trays. It can be used in the harsh conditions of the warm and saline Nile Delta,” says Bruning. “By keeping the design minimal we can ensure it works even in remote areas. And to make it affordable, we use locally available materials wherever possible.”

On top of that, the system uses around 80% less water compared to conventional irrigation. Bruning explains: “Water loss through evaporation is almost eliminated because the surface is fully covered by floating trays. Plants still transpire, but the absence of open water drastically reduces overall water use.”

At five pilot sites across the delta region, the team has now succeeded in cultivating vegetables year-round. “Initially, trials faced predictable challenges,” shares Bruning. “The first crops included pak choi. However, this variety was unfamiliar to local consumers. We soon realised that even the most salt-tolerant crop is useless if no one wants to buy it. So we switched to local lettuce and cabbage varieties that locals already know and that the farmers could sell at the market.”

From scepticism to success

Convincing farmers to experiment with a new growing method took time. For many, the idea of producing vegetables in floating trays rather than soil seemed counterintuitive. “At first, the local farmers didn’t trust our solution. But as results improved, perceptions shifted,” says Bruning.

“Through a combination of technical training, field visits, and peer-to-peer learning, farmers began to see consistent quality and reliable yields.” A real turning point came when they received positive feedback from the market about their hydroponically grown cabbages. “Though smaller in size, they were denser, tastier, and fetched better prices,” says Bruning. “This convinced the farmers that the new cultivation system could be profitable and give their incomes a real boost.”

The project also benefited from collaboration with two Master’s students from the Vrije Universiteit Amsterdam. These students conducted social and technical research on farmer engagement. Their findings confirmed what the field experience showed: alignment between local practices, perceptions and new technology is key to adoption. “It’s not just about the technology,” Bruning emphasises, “it’s also about building trust”.

Technology shaped by experience

“Earlier systems in the Netherlands, Tunisia and Vietnam performed well with brackish water and salt tolerant crops. They demonstrated that this approach can support food production in saline environments. In Egypt, depending on the location, we use brackish or fresh water.”

The system in Egypt has evolved through hands-on experimentation. Early prototypes used different types of pumps, pots and rafts until the team found the right combination. The focus remained on ensuring durability and reducing costs without compromising quality. “Some components – like one key pump – are still imported from the Netherlands to guarantee quality,” says Bruning. “But most parts are now sourced locally.”

“Affordability is our biggest design constraint,” Bruning notes. “We’re still looking for ways to lower the return-on-investment time for smallholders. That means further simplifying the system while maintaining stable performance.”

Scaling salinity solutions

As the project approaches its final stages, the focus turns to consolidating lessons learned and preparing for broader application. The next phase focuses on scaling up – both technically and socially. Two new farmers have already joined the project, and they requested pilot hydroponic systems that were recently added. “In the long run, we hope to see a network of small hydroponic farms across the delta,” Bruning explains. “If we can support a hundred farmers in one area, providing weekly monitoring and training, this will make a promising impact on food security at the local level.

The project has developed a new instructional video for the hydroponics system, featuring footage from our demonstration sites.

In the neighbourhoods along the Juan Angola Canal, a downpour is rarely without consequences. Streets can flood within minutes, and the city has spent years trying to bring urban growth back in step with the landscape. With phase 3 of Water as Leverage, this should take shape for the first time, with detailed designs and implementation roadmaps for paving stones, culverts and mangrove restoration. Furthermore, these plans are genuinely bankable and ready to implement.

What is Water as Leverage?

Water as Leverage (WaL) is a Dutch approach that reverses the usual sequence: rather than having a technical plan first and then looking for support and funding, this approach brings together knowledge, governance, financing, and communities from day one. In multidisciplinary teams of Colombian, Dutch, and international experts, early sketches grow into concrete designs ready for further development.

“It’s the integrated perspective – physical system, ecology, economy, employment, and financing – that makes WaL truly unique,” explains Michel Zuijderwijk from Witteveen+Bos. “You’re not only designing for water, but also for the city and its residents.” Witteveen+Bos is the lead partner of the Roots of Cartagena team, which has been working within the Water as Leverage Cartagena programme.

What is the current status of the WaL Cartagena programme?

During phase 1 which started in February 2023, these two teams explored Cartagena’s bottlenecks and opportunities regarding water and climate adaptation. This produced an initial city outlook and a selection of hotspots where water, public space, and quality of life intersect. At the end of this phase, eleven concepts were on the longlist.

During phase 2, beginning at the end of September that year, this was narrowed down to five serious project candidates and technically underpinned to pre-feasibility. Five local design workshops with local stakeholders proved decisive: specific areas of the Juan Angola Canal were given the green light to continue towards a third phase, with nature-based measures and practical interventions that are easy to scale up.

Colombian delegation’s visit to the Netherlands: three lessons

As the kick-off for the third and final phase of this programme, a Colombian delegation visited the Netherlands to look at waterworks, nature-inclusive projects, and maintenance regimes, such as the Sand Engine near Kijkduin (beach nourishment as coastal protection), Benthemplein Water Square in Rotterdam (urban water storage), and the Marker Wadden islands (nature restoration built with dredged sediment). Wilmer Iriarte Restrepo, Cartagena’s Secretary of Infrastructure, named several key insights to take into the next phase:

• Link flood resilience to public space.
  “Look at flood resilience and public space as one entity. Maintenance thus becomes logical and you create pleasant places that residents actually use.”
• Let nature do the work.
  “From ‘sand motor’ to sluices: harness natural processes and the topography to filter and direct water. Not dogmatically, but flexibly: what works here may work differently elsewhere.”
• Keep solutions simple and scale them up.
  “Sometimes the best intervention is to give streets a little more slope and install a narrow gutter in the drainage system. Simple in itself, but if applied a thousand times, the cumulative impact is substantial.”

This down-to-earth view aligns with the WaL method: nature-based solutions where possible, hard interventions where necessary. “NBS are never one-size-fits-all,” says Zuijderwijk. “They are context-specific; that’s precisely why you always design together with the place in question.”

The next phase: feasibility studies for the Juan Angola Canal

One project has been selected within WaL Cartagena to proceed to feasibility studies in phase 3: the Juan Angola Canal. The WaL Project Proposal concerns flood resilience and quality of life, upstream and downstream, and is well aligned with local needs and plans. It roughly entails the following:

• Along Juan Angola, the bank would be gradually transformed into a continuous city park. The canal would be given room to breathe: it would be deepened and restored so that water can flow better. A footpath would connect places to linger and steps down to the water; in quieter sections, reed beds, riparian plants, and shallow sheltered zones will attract fish, birds, and insects. This gives rise to a place where flood protection coincides with a pleasant, green route through the neighbourhood.
• Higher up, on the slopes and in the streets, rainwater would be retained. Infiltration cells, green verges, and small storage areas give water time to percolate into the soil, while at strategic points, culverts lead the surplus to the canal in a controlled way. Replanting bare embankments binds the soil and slows erosion, so that less sand and silt reach the lower city. The result would be a chain of simple interventions that together calm the system and make the neighbourhood more liveable.

“I see a lot of methodological overlap between the WaL design and what the municipality is already doing,” says Iriarte. “From the characterisation of the micro-catchment to the idea of public space with footpaths and viewpoints: we’re on the same page. I also recognize innovative elements from the WaL team – for example, ideas related to biodiversity in the canal; we’d like to replicate those.”

What the Netherlands has learned from the WaL Cartagena programme

Barbara Swart, coordinator of bilateral cooperation on water and climate adaptation at the Dutch Ministry of Infrastructure and Water Management (IenW) and lead within Partners for Water, sees in WaL Cartagena exactly what the Netherlands is aiming for with international cooperation: impact on the ground and learning from each other. “It’s great to provide and to collect knowledge,” says Swart. “But above all, we want to see that this knowledge is used: that Cartagena’s residents benefit directly. WaL is integral and inclusive; it is developed together with the communities. That makes it stronger.”

On an earlier visit to the city, she and her team saw the enormous opportunities here. It’s a coastal city where water and climate challenges, public space, and social development converge. That makes the area eminently suitable for projects that not only reduce flood risks, but also regreen neighbourhoods, improve health and quality of life, and strengthen local ownership. Because the city also prioritises these aspects and financiers have been engaged from day one, this paves the way for tangible results in the short term and a scalable route to larger water infrastructure.

She emphasises that this cooperation is a two-way street. “We’re still ‘Nederland Waterland’, a country reclaimed from the water,” says Swart, “but in other regions, extreme rains, heat and drought have been going on longer and are more severe. We can learn from that. A striking example is the principle that water and soil are considered in spatial decisions. The Netherlands and Colombia embedded this in policy around the same time. Then you want to know how it works in practice. Who achieves results faster, and why?”

Financing: early at the table, but with local ownership

From the start, financiers and development banks have been at the table to test whether a design will be bankable later. Swart: “Here we have an intermediary role: bringing parties to the table and hearing their ideas. But ownership lies in Cartagena. The city must determine whom to partner with and how the link to national budgets will work. We’re not the leading party. (…) The most important thing is to produce concrete, bankable packages which financiers can commit to.” Financing resilient urban projects is usually challenging, due to fiscal restrictions in governments, both local and national, emphasises Zuijderwijk.

Final phase

Meanwhile, work continues apace. “In the short term, the municipality would like to push at least one section of the canal design quickly through the approval process,” says Zuijderwijk. “A challenge, but doable. Immediately after, we would elaborate the longer-term measures: hydrological model, impact calculations, environmental frameworks, and the financing mix.” Phase 3 is being shaped with our partners at the municipality, says Swart. “We want to deliver early results and set out the vision and elaboration for the larger water infrastructure project that can be implemented later.”

Participation as a design decision-maker

Social dialogue will be crucial in the period ahead. Iriarte sees an opportunity here. “In phase 3 we can establish methods and forms of social consultation that allow us to systematically gather residents’ ideas, knowledge, and concerns. Neighbours sometimes disagree – you must keep an eye on that. It could be about something small, like where a bridge should be. But that’s where a good solution begins, by accommodating the different parties.” This ties in with one of the aspects Swart finds so inspiring in Colombia: “Embedding indigenous and local knowledge. We have participation in the Netherlands too, but in Colombia you see how self-evident it is that communities co-decide. It works, and it translates into simpler maintenance and tangible ownership.”

What is ultimately at stake?

For Cartagena: fewer floods, more shade and greenery, better access to water and public space, and less sediment washing into the lower city. For the Netherlands: practical knowledge about scaling up nature-inclusive solutions in a tropical coastal city, about financing climate adaptation projects, and about embedding management in community structures. Regarding global cooperation, there is another ambition. “In 2023 we agreed the Water Action Agenda at the UN Water Conference,” says Swart. “This means we need to take action. We talk a lot, but ultimately, it’s about visible results. Because of the effects of climate change the urgency has grown, and I would love it if we could demonstrate what WaL has delivered in concrete terms at the next conference in 2026. This requires a joint acceleration now. To get there, all partners – Cartagena’s authorities, communities, Dutch and international funders, and the WaL consortium – need to accelerate delivery now.”