Reunion's Water Crisis Triggers Emergency Infrastructure Overhaul as River Flow Plummets

Reunion Island’s Langevin River recorded just 51 liters per second in July, a flow level never before documented for that month. Authorities had expected between 700 and 750 liters per second. That gap, more than a tenfold shortfall, captures the scale of the water crisis now forcing emergency infrastructure action across the island.

Faïçal Badat, director general of the Office of the Water at Reunion, confirmed the historic low. Groundwater levels across the island have fallen well below seasonal norms, and insufficient rainfall has failed to replenish aquifers. Record July temperatures compounded the depletion. The result is an operational crisis that existing infrastructure and management practices cannot adequately address.

The Department, which holds formal responsibility for water management on the island, has responded with a two-track infrastructure strategy developed alongside the Water Office and Saphir, the hydraulic network operator. The first track centers on the MEREN project, designed to transport irrigation water to agricultural producers in the northern and eastern zones while simultaneously making water available to intercommunal entities including Cirest and Cinor. The second focuses on pumping water to higher elevations across the island’s upper regions, enabling irrigation of agricultural lands at altitude.

Cyrille Melchior, president of the Department of Reunion, described the approach directly. “There is the MEREN project. It is about bringing irrigation water for farmers in the North and East zones. It is also about making water available to intercommunalities like Cirest and Cinor. The second point of our strategy is to pump water as high as possible to irrigate agricultural land in the upper part of the island,” he said.

The financial commitment behind these projects is substantial. One billion euros will be invested over the coming years to preserve and secure the water resource across the island’s hydraulic systems. That figure signals how seriously the Department views the long-term supply risk.

Meanwhile, governance structures are being reformed to support delivery. Saphir, the hydraulic network manager owned by the Department, will undergo an operational restructuring intended to streamline procedures and accelerate decision-making. The adjustment targets administrative bottlenecks that risk slowing implementation of preservation measures at precisely the moment speed matters most.

On the agricultural side, Melchior has formally requested that the national government recognize the drought as an agricultural calamity. The designation would unlock compensation mechanisms for farmers facing documented losses, providing a financial buffer during the extended dry period. The request reflects the direct threat that depleted water resources pose to farm viability across the island.

Whether the billion-euro plan and governance reforms can be executed quickly enough to prevent further deterioration in the coming seasons remains the central question for the agencies now responsible for delivery.