Uganda’s rich river network offers both promise and peril as climate extremes reshape the country’s hydrological future.
Uganda’s river basins boasts one of East Africa’s richest hydrological networks, with 15% of the country covered by surface water and crisscrossed by 160 rivers. The four Great Lake : Victoria, Kyoga, Albert, and Edward, are entirely in Uganda or along its borders, forming a chain of natural reservoirs in the upper White Nile basin.
The Victoria basin dominates the southeast, where the Victoria Nile originates, and its dams generate 80% of the nation’s electricity. Downstream in the center of the country, Lake Kyoga regulates the White Nile with swampy areas storing abundant rainfall.
Lakes Albert, Edward, and George occupy the Rift Valley, fed by Rwenzori mountain rivers that cause recurrent floods in the west disrupting fishing periods. The Aswa and Kidepo rivers drain the north, where droughts impact pastoralism and deficits are frequent.
Uganda’s basin seasonality ties to rainfall patterns driven by the Intertropical Convergence Zone (ITCZ). The ITCZ produces a bimodal regime in the south, bringing long rains from March to May and shorter rainy spells from September to November. Farther north, a unimodal regime prevails from June to August, leading to rising rainfall deficits.
Different basins respond variably to these rains. Lakes reduce downstream flood peaks by 30 to 70 percent during intense events, whereas the Rift Valley slopes accelerate floods in the west. In contrast, central areas benefit from thick laterite mantles that promote infiltration and delay runoff via evapotranspiration.
Climate trends show decreasing rainfall from June to August nationwide, while the first wet season, from March to May, is also in deficit in the east.
These climate change-related phenomena trigger increasingly severe events, like the 2020 Kasese floods or the 2016-2017 droughts affecting 1.6 million in Karamoja.
Recent policy responses are now reshaping Uganda’s basin management in the face of climate stress. In its 2024/25 policy statement, the Ministry of Water and Environment reaffirmed climate resilience, catchment protection, and improved water services as sector priorities.
Uganda also advanced its climate agenda by integrating water and sanitation into its updated climate framework in 2022 and by finalizing a WASH-specific National Adaptation Plan in 2026 to strengthen responses to floods, droughts, and rising temperatures. In parallel, projects such as the Climate Resilience Arua programme and the new water-security initiative for the Cattle Corridor support resilient infrastructure, restoration of degraded areas, and better water storage.
Together, these measures help Uganda strengthen coordination, protect services, and adapt its river basins to growing climate risks.
