Which Soil Bunds Actually Pay Off? Economics of Land Restoration in Ethiopia’s Blue Nile Highlands

Ethiopia’s highlands are among the most eroded farmlands on Earth, and for decades the country has poured labor and money into terraces, bunds, and grass strips to hold its soil in place. Yet a persistent question has haunted policymakers and farmers alike: do these structures actually pay for themselves? A new study by Gashaw Tenna Alemu of Bahir Dar University, published in SN Social Sciences, tackles that question with unusual rigor, comparing the long-run profitability of four widely promoted sustainable land management practices across three watersheds in the Upper Blue Nile Basin. The findings deliver a sobering message: not every conservation structure is a good investment, and the economics shift dramatically with elevation, agroecology, and the assumptions buried in the analysis itself.

The research draws on cross-sectional data from 385 farming households and 726 individual plots, spanning lowland, midland, and highland watersheds in one of Ethiopia’s most agriculturally critical regions. The Upper Blue Nile Basin feeds the reservoirs of major hydropower dams and sustains millions of smallholder families whose plots grow smaller and steeper with each generation. Land degradation there is not an abstract environmental concern; it is a direct threat to food security and rural incomes. Alemu focused on four practices that dominate Ethiopia’s conservation landscape: simple soil bunds, soil bunds reinforced with grass, stone bunds, and stone-faced soil bunds, each representing a different balance of labor, materials, and expected returns.

Methodologically, the study goes beyond the simple before-and-after yield comparisons that have characterized much of the earlier literature. Alemu evaluated economic profitability using gross margin analysis and full cost-benefit analysis, computing the net present value and internal rate of return for each practice over a 20-year planning horizon with a 10 percent discount rate. This long time frame matters because conservation investments typically impose their heaviest costs up front, during construction, while their benefits, in the form of reduced soil loss and improved crop productivity, accumulate slowly over many seasons. Discounting future benefits at 10 percent reflects the reality that poor farmers value a birr today far more than a birr a decade from now, and it places a heavy analytical burden on practices whose payoffs are delayed.

The results reveal striking spatial variation. In the lowland watershed, simple soil bunds and stone bunds emerged as the relatively more economically beneficial options, delivering returns that justified their establishment and maintenance costs over the investment period. In the midland and highland watersheds, however, the picture changed: soil bunds combined with grass proved the most profitable choice. The grass component, which stabilizes the bund face, suppresses runoff, and provides valuable fodder for livestock, appears to tip the economic balance in wetter, cooler environments where biomass production is strong. This agroecology-specific pattern is the study’s central practical insight, suggesting that blanket national recommendations for conservation structures may be systematically misallocating scarce rural labor and public funds.

Perhaps the most consequential finding concerns what did not work. Stone bunds in the midland watershed failed the economic test entirely. Their relatively high establishment and labor costs, hauling and stacking stone is among the most labor-intensive forms of conservation construction, were not sufficiently compensated by the expected increases in crop productivity over the 20-year horizon. In other words, farmers and campaign workers who invest days of heavy labor building stone terraces in that agroecology are, on purely financial grounds, pouring effort into a structure that will never repay them. The result does not deny that stone bunds reduce erosion; it simply shows that erosion control alone, valued only through crop yields, can be an unprofitable proposition in certain settings.

Equally important is the study’s sensitivity analysis, which probes how fragile the profitability verdicts are to changes in underlying assumptions. The results proved highly sensitive to the discount rate, to crop productivity levels, and to investment costs. Small shifts in any of these parameters could flip a practice from profitable to unviable or vice versa. This finding carries a warning for the entire field of conservation economics: differences in assumptions can substantially influence the outcome of cost-benefit assessments, meaning that two credible analysts applying the same methods to the same practices may reach opposite conclusions depending on how they set their discount rates or estimate yield gains. Transparency about assumptions, the study implies, is not an academic nicety but a prerequisite for sound policy.

The broader context amplifies the stakes. Previous research in the Ethiopian highlands has documented severe soil loss rates on cultivated slopes, and national restoration initiatives have mobilized millions of workers through campaign-based watershed management programs. Earlier studies have shown that soil and water conservation measures can reduce runoff and nutrient loss and improve soil properties, and that large-scale restoration has improved drought resilience in degraded watersheds. But adoption by farmers has often lagged, and one recurring explanation is economic: when structures consume labor that could otherwise be spent on weeding, herding, or wage work, and when the yield response is slow or modest, the private calculus turns negative. Alemu’s study quantifies exactly that tension, practice by practice and watershed by watershed.

The policy implications are threefold. First, sustainable land management interventions should be targeted at agroecology rather than rolled out uniformly; the same structure that pays in the lowlands may lose money in the midlands. Second, policy instruments that lower the costs of establishment and maintenance, whether through tool banks, organized labor sharing, or subsidies for the most labor-intensive phases, could tip marginal practices into profitability. Third, agricultural intensification efforts aimed at raising land productivity would increase the financial feasibility of conservation measures, because higher baseline yields mean that any percentage gain from reduced erosion translates into larger absolute returns. In effect, the study argues that conservation and productivity investment must move together, not as alternatives.

For the international community watching Ethiopia’s restoration ambitions, the message is both cautionary and encouraging. Cautionary, because the era of assuming that every terrace is a win-win investment is over; the numbers demand agroecology-specific design and honest accounting of labor costs. Encouraging, because the analysis identifies concrete conditions under which conservation pays: grass-reinforced bunds in the mid and high altitudes, simple and stone structures in the lowlands, and any practice supported by cost-reducing policy instruments. As climate change intensifies rainfall variability across the Nile headwaters, the difference between profitable and unprofitable conservation may determine whether Ethiopia’s farmers can afford to keep their soil on their fields, and whether the Blue Nile keeps carrying it away.

Subject of Research: Economic profitability of sustainable land management practices in the Upper Blue Nile Basin, Ethiopia

Article Title: Profitability of sustainable land management practices in the Upper Blue Nile Basin, Ethiopia

Article References: Alemu, G. T. (2026). Profitability of sustainable land management practices in the Upper Blue Nile Basin, Ethiopia. SN Social Sciences, 6(10), Article 528. https://doi.org/10.1007/s43545-026-01844-4

Image Credits: AI Generated

DOI: 10.1007/s43545-026-01844-4

Keywords: sustainable land management, soil bunds, stone bunds, cost-benefit analysis, soil erosion, Ethiopia, Upper Blue Nile Basin, agroecology, smallholder farming, net present value, land degradation, soil and water conservation