Sustainability and unintended impact assessment of water spreading weirs (WSW) and establishment of long-term monitoring site

The Afar region in Ethiopia receives floods generating from the adjacent highlands of Amhara and Tigray regional states. With changing climates and more frequent extreme events being expected in the Ethiopian highlands, flooding in Afar may lead to catastrophic damages in the already fragile ecosystem as a result of land degradation.

A key technological innovation within SDR is the introduction of water-spreading weirs (WSW) in the Afar region. A water-spreading weir slows water flowby spreading the water over a large area and increasing infiltration. WSWs enable rainwater to be stored and increase the area along the banks of the dry valleys, which is suitable for cultivation. Weirs are never built individually. To be effective, managing drainage systems necessitates the construction of a series of weirs. Each of which spreads water that upstream weirs couldn’t spread and in this way re-enforcing each other.

MetaMeta, Mekelle University and Semara University are jointly carrying out this evaluation. Below some of the results so far can be accessed.

Presentations Workshop September 2020