The Rufiji River flood: plague or blessing?

Area of Science:

• Environmental Science
• Development Studies
• Hydrology

Background:

• A large multipurpose dam is planned for Stiegler's Gorge on the Rufiji River, Tanzania, with authorities prioritizing flood control.
• National and local authorities perceive Rufiji River floods as a development constraint due to high flow variability.
• Local communities, however, view floods as essential for floodplain fertility, agriculture, and natural resource productivity.

Purpose of the Study:

• To investigate the discrepancy between official and local perceptions of Rufiji River floods.
• To analyze the socio-economic and ecological implications of the planned dam's flood control measures.
• To propose alternative development strategies that consider the beneficial aspects of flooding.

Main Methods:

• Comparative analysis of official development discourse and local community perceptions.
• Assessment of the ecological and livelihood impacts of altered flood patterns.
• Review of historical flood-related events and policy influences.

Main Results:

• Local communities perceive floods as a vital resource, while droughts pose the primary threat.
• The "flood as a plague" narrative emerged in the late 1960s, influenced by policy and potentially inadequate technical assessments.
• The proposed dam design, by altering flood patterns, risks negative consequences for downstream ecosystems and the livelihoods of approximately 150,000 people.

Conclusions:

• There is a critical divergence between the perceived risks and benefits of Rufiji River floods by authorities and local communities.
• The current dam project, focused solely on flood control, may undermine crucial ecosystem services and local livelihoods.
• Prioritizing cost-benefit analyses of flood control and exploring dam designs that preserve beneficial flooding is essential for sustainable development.