For West African Farmers, Reservoirs Hold Much More Than Just Water

Sarah Jones, Associate Scientist at The Alliance of Bioversity International and CIAT and part of the CGIAR Research Program on Water, Land and Ecosystems (WLE), shares insights into the complex relationship between small reservoirs and farmers, and why donor agencies and governments should be careful when funding the development of new ones.

Farmers have always lived in symbiosis with nature. They spend most of their time outside and are all too aware that rain, sun, pests and pollinators dictate not only what is for dinner, but also the mood around the table. But, the many ways in which nature impacts farmers are rarely fully acknowledged in agricultural development policies and programs. This puts their interventions at risk of overlooking, or even undermining, important sources of farmers’ well-being.

Small reservoirs in West Africa

In the Volta River basin, which spans much of Ghana and Burkina Faso, at least 1,000 small reservoirs have been constructed over the past century to provide farmers with multiple benefits, including water for irrigation, fish and livestock, whilst providing much-needed relief during the long dry seasonDonor agencies and governments have continued to support the development of additional reservoirs, with Ghana and Burkina Faso committed to constructing many new reservoirs over the next decade.

The water and fish in these reservoirs provide farmers with food and income, but how do the reservoirs affect other dimensions of farmers’ lives? And how important are the benefits derived from reservoirs compared to those provided by other parts of the local landscape?

To find out more, researchers from Bioversity InternationalSNV Burkina Faso and King’s College London interviewed 37 farmers around four reservoirs in Burkina Faso and Ghana. These farmers were asked about the different benefits and problems (so-called ecosystem ‘services’ and ‘disservices’) emerging from natural and managed ecosystems and how they influence their well-being, including farmer wealth, health, sense of security and happiness.

Farmers map out ecosystem services and disservices near Binaba reservoir in Ghana. Credit: Sarah Jones.

In the end, they identified and mapped 14 benefits and two problems, rating how important they felt each issue was for their well-being.

For better and for worse

The farmers’ answers taught us something important about their relationship with nature – something that has implications for future investments in small reservoirs and rural landscapes.

First, for most farmers, reservoir benefits are of “high” or “very high” importance to their health, wealth and happiness, but the effect on well-being can be either positive or negative. While fish and agricultural water from reservoirs help secure good nutrition, food pleasure and income, reservoirs are a source of malarial mosquitoes.

These pose a major threat to farmers’ health, which has knock-on effects on labour availability and thus wealth. The fact that farmers consider the positive and negative health and wealth impacts of reservoirs to be of comparable importance raises a red flag to decision-makers wanting to ensure net benefits of reservoir investments.

Second, many ecosystem services not provided by the reservoir, but by the landscape, were considered equally important to a farmer’s well-being. Farmers also listed negative impacts stemming from the surrounding land, including farmland pests, such as birds and worms, which cause crop and livestock losses.

Finally, our results show that ecosystems as a whole contribute to farmers’ well-being in subtle ways. Farmers told us that access to certain foods produced in the landscape contribute to their happiness and pleasure while using green spaces for recreation and traditional rituals helps them maintain good social relations.

This result is particularly interesting because it highlights some of the less tangible benefits that are not often recognised in established agendas such as the Sustainable Development Goals yet are highly important to farmers.

Farmers rated the importance of each service and disservice and explained how exactly their human well-being (HWB) was changed. Their responses into grouped into common themes, and chart indicates what percentage of responses related to each ecosystem service, disservice or well-being outcome.

What does this mean for how reservoir landscapes in the Volta River basin are managed?

The farmers’ answers highlight that future investments should not only focus on maximizing benefits from reservoirs – the surrounding land also matters. Expansion of irrigated cropland next to reservoirs can encroach on bushland, robbing farmers of multiple benefits that reservoirs cannot provide, such as fuelwood, medicinal plants, organic fertilizer, wild fruits and fodder for livestock. Most farmers we talked to considered these benefits just as important for their well-being as the ones provided by reservoirs.

Negative impacts also need to be mitigated to ensure net benefits to well-being, especially when it comes to increased exposure to malarial mosquitoes.

Finally, investors need to consider the less obvious benefits reaped from the landscape, including how it feeds farmers’ happiness and social relations.

What it takes

Reservoirs in the Volta River basin must be managed in holistic ways to achieve food goals, nature conservation and community well-being. Ecosystem management alone is not enough to ensure that farmers thrive – social, economic and political decisions play big roles, as does physical infrastructure.

Yet, this research adds to the body of evidence that nature influences how healthy, wealthy, secure and happy people are in many different ways – all of which need to be fully integrated into local and national development planning and investments to sustainably secure human well-being outcomes.