Implications of water abstraction on the interconnected Central Rift Valley Lakes sub-basin of Ethiopia using WEAP

Central Rift Valley Lakes sub-basin, Ethiopia. The competition for water is rapidly increasing in lakes sub-basin due to the combined effect of various resources developments. However, impacts recent and future development pathways on balance three interconnected (i.e. Lake Ziway, Langano Abiyata) are unknown. Water Evaluation And Planning (WEAP) model was used assess lakes. We considered that are, (2009–2018), short-term (2019–2028) long-term (2029–2038). Ziway inflows from six catchments were estimated using Hydrologiska Byråns Vattenbalansavdelning (HBV) rainfall-runoff model. Crop requirements irrigation schemes by CROPWAT WEAP simulations show a total demand 102.3 Mm 3 under pathway increases 46% 118% pathways, respectively. This will notably affect cause an unmet 47.9 (2028–2038) . For Abiyata, levels decrease substantially scarcity long-term, developments significantly storage Abiyata storages Abiyata. Overall, threaten resource lake system. • Implications abstraction evaluated over sub-basin. Integrated approach (rainfall-runoff, WEAP) multisource data improve assessment. amount has substantial impact presence significant both level volume.