Authors : Moses David Tumusiime; Lawrence Aribo; Benon Kalema; Exavery Kisesa Makula

Volume/Issue : Volume 10 - 2025, Issue 3 - March

Google Scholar : https://tinyurl.com/3fvhzts4

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DOI : https://doi.org/10.38124/ijisrt/25mar666

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Abstract : Studying rainfall distribution is important for sustainable water resource control and economic activities. This research explored seasonal and annual spatiotemporal rainfall variability and trends in East Africa and their impacts on Lake Victoria water levels to update information to support planning, management, and improvement of water-dependent socio-economic activities. Surface water observations for both the satellite (DAHITI altimetry) and ground station for 30 years were used in the study. The datasets were normalized, and analysis of rainfall variability and trends was carried out to determine its influence on lake victoria water levels the shared lake of East Africa. Study results showed an rise in water levels in Lake Victoria for the previous 30 years. The precipitation trends indicated a non-significant increase, as verified by Mann Kendall and the linear fit (Sen’s) test. Moreover, there was an obvious variation in seasonal rainfall, where rainfall seasons was varying much compered to dry seasons. Significant correlations were observed between rainfall from Bunjumbura and Gisozi ground-based rainfall stations and Lake Victoria water levels, although a weak relationship exists with other ground-based stations around the Lake Victoria basin. The study concludes that rainfall affects the variations in the lake water levels to a lesser extent; hence, it is recommended considering the analysis of other different water resources in the Lake Victoria catchment, especially inlet rivers and ground water. The evidence acquired from this research will be important for decision-makers to take proper adaptive measures in water resource management.

Keywords : Rainfall Variability, Water Levels, Lake Victoria, East Africa.

References :

1. Alex, N., Basalirwa, C.P.K., Majaliwa, J.G.M., 2013. Nature and dynamics of climate variability in the Uganda cattle corridor. African J. Environ. Sci. Technol. 7, 770–782. https://doi.org/10.5897/AJEST2013.1435
2. Awange, J.L., Ogalo, L., Bae, K., Were, P., Omondi, P., Omute, P., Omullo, M., 2008. Falling Lake Victoria water levels : Is climate a contributing factor ? 281–297. https://doi.org/10.1007/s10584-008-9409-x
3. Cristiano, E., Veldhuis, M., Giesen, N. Van De, 2017. Spatial and temporal variability of rainfall and their effects on hydrological response in urban areas – a review. Hydrol. Earth Syst. Sci. 21, 3859–3878. https://doi.org/10.5194/hess-21-3859-2017
4. Herrnegger, M., Stecher, G., Schwatke, C., Olang, L., 2021. Journal of Hydrology : Regional Studies Hydroclimatic analysis of rising water levels in the Great rift Valley Lakes of Kenya. J. Hydrol. Reg. Stud. 36, 100857. https://doi.org/10.1016/j.ejrh.2021.100857
5. Hulme, M., Doherty, R., Ngara, T., New, M., Lister, D., 2001. African climate change: 1900-2100. Clim. Res. 17, 145–168. https://doi.org/10.3354/cr017145
6. Kizza, M., Rodhe, A., Xu, C.-Y., Ntale, H.K., Halldin, S., 2009. Temporal rainfall variability in the Lake Victoria Basin in East Africa during the twentieth century. Theor. Appl. Climatol. 98, 119–135. https://doi.org/10.1007/s00704-008-0093-6
7. Mugume, I., Mesquita, M.D.S., Basalirwa, C., Bamutaze, Y., Reuder, J., Nimusiima, A., Waiswa, D., Mujuni, G., Tao, S., Ngailo, T.J., 2016. Patterns of Dekadal Rainfall Variation Over a Selected Region in Lake Victoria Basin , Uganda. Atmophere 11, 150, 1–23. https://doi.org/10.3390/atmos7110150
8. Nicholson, S.E., 2018. The ITCZ and the seasonal cycle over equatorial Africa. Bull. Am. Meteorol. Soc. 99, 337–348. https://doi.org/10.1175/BAMS-D-16-0287.1
9. Nicholson, S.E., 2017. Climate and climatic variability of rainfall over eastern Africa. Rev. Geophys. 55, 590–635. https://doi.org/10.1002/2016RG000544
10. Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Bevis, Y., Adetunji, A.O., Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Bevis, Y., 2014. The nature of rainfall in the main drainage sub- basins of Uganda The nature of rainfall in the main drainage sub-basins of Uganda. Hydrol. Sci. J. – J. des Sci. Hydrol. 59, 278–299, https://doi.org/10.1080/02626667.2013.804188.
11. Ojara, M.A., Yunsheng, L., Babaousmail, H., Wasswa, P., 2021. Trends and zonal variability of extreme rainfall events over East Africa during 1960–2017. Nat. Hazards 109, 33–61. https://doi.org/10.1007/s11069-021-04824-4.
12. Tumusiime, M.D., Ageet, S., 2018. Assessment of Impacts of Climate Change on Hydro-meteorological Ecosystem Services and Water Stress in Lake Kyoga Catchment. Int. J. Res. Eng. 5, 345–354. https://doi.org/10.21276/ijre.2018.5.4.2.
13. Nimusiima, A, N., Basalirwa, C.P.K., Majaliwa, J.G.M., 2013. Nature and dynamics of climate variability in the uganda cattle corridor. African J. Environ. Sci. Technol. 7, 770–782. https://doi.org/10.5897/AJEST2013.1435
14. Awange, J.L., Ogalo, L., Bae, K., Were, P., Omondi, P., Omute, P., Omullo, M., 2008. Falling Lake Victoria water levels : Is climate a contributing factor ? 281–297. https://doi.org/10.1007/s10584-008-9409-x
15. Cristiano, E., Veldhuis, M., Giesen, N. Van De, 2017. Spatial and temporal variability of rainfall and their effects on hydrological response in urban areas – a review. Hydrol. Earth Syst. Sci. 21, 3859–3878. https://doi.org/10.5194/hess-21-3859-2017
16. Herrnegger, M., Stecher, G., Schwatke, C., Olang, L., 2021. Journal of Hydrology : Regional Studies Hydroclimatic analysis of rising water levels in the Great rift Valley Lakes of Kenya. J. Hydrol. Reg. Stud. 36, 100857. https://doi.org/10.1016/j.ejrh.2021.100857
17. Hulme, M., Doherty, R., Ngara, T., New, M., Lister, D., 2001. African climate change: 1900-2100. Clim. Res. 17, 145–168. https://doi.org/10.3354/cr017145
18. Kansiime, M.K., Wambugu, S.K., Shisanya, C.A., 2013. Perceived and Actual Rainfall Trends and Variability in Eastern Uganda : Implications for Community Preparedness and Response. J. Nat. Sci. Res. 3, 179–195.
19. Kizza, M., Rodhe, A., Xu, C.-Y., Ntale, H.K., Halldin, S., 2009. Temporal rainfall variability in the Lake Victoria Basin in East Africa during the twentieth century. Theor. Appl. Climatol. 98, 119–135. https://doi.org/10.1007/s00704-008-0093-6
20. Mubiru, Drake N.; Komutunga, Everline; Agona, Ambrose; Apok, Anne; Ngara, T., 2012. Characterizing agrometeorological climate risks and uncertainties : Crop production in Uganda. S. Afr. J. Sci. 108(3–4), 108–118. https://doi.org/10.4102/sajs.v108i3/4.470
21. Mugume, I., Mesquita, M.D.S., Basalirwa, C., Bamutaze, Y., Reuder, J., Nimusiima, A., Waiswa, D., Mujuni, G., Tao, S., Ngailo, T.J., 2016. Patterns of Dekadal Rainfall Variation Over a Selected Region in Lake Victoria Basin, Uganda. Atmosphere 11, 150, 1–23. https://doi.org/10.3390/atmos7110150
22. Nicholson, S.E., 2017. Climate and climatic variability of rainfall over eastern Africa. Rev. Geophys. 55, 590–635. https://doi.org/10.1002/2016RG000544
23. Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Bevis, Y., Adetunji, A.O., Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Nsubuga, F.W.N., Botai, O.J., Olwoch, J.M., Rautenbach, C.J., Bevis, Y., 2014. The nature of rainfall in the main drainage sub- basins of Uganda The nature of rainfall in the main drainage sub-basins of Uganda. Hydrol. Sci. J. – J. des Sci. Hydrol. 59, 278–299. https://doi.org/10.1080/02626667.2013.804188
24. Ojara, M.A., Lou, Y., Aribo, L., Namumbya, S., Uddin, M.J., 2020. Dry spells and probability of rainfall occurrence for Lake Kyoga Basin in Uganda, East Africa. Nat. Hazards 100, 493–514. https://doi.org/10.1007/s11069-019-03822-x
25. Nicholson SE (1998) Historical fluctuations of Lake Victoria and other lakes in the Northern Rift valley of East Africa. In: Lehman JT (ed) Environmental Change and Response in East African lakes. Kluwer, Dodrecht, pp 7–35
26. Kizza, M., Westerberg, I., Rodhe, A. and Ntale, H.K., (2010). Estimating areal rainfall over Lake Victoria and its basin using ground-based and satellite data. Journal of Hydrology. In review: 21pp.
27. Saji, N.H., Boswami, B.N., Vinayachanran, P.N. and Yamagata, T. (1999) A Dipole Mode in the Tropical Indian Ocean. Nature 401, 360-363.
28. Conway, D. and Hulme, M., 1993. Recent fluctuations in precipitation and runoff over the Nile sub-basins and their impact on main Nile discharge. Climatic change, 25 (2), pp.127-151.
29. Influence of rainfall and water level on inland fisheries production: A. E. S. PATRICK. Department of Bio-Science, Faculty of Applied Science, Vavuniya Campus of the University of Jaffna, Sri Lanka. (2016)
30. G. W. KITE (1982) Analysis of Lake Victoria levels, Hydrological Sciences Journal, 27:2, 99-110, DOI: 10.1080/02626668209491093
31. Mafaranga, H. (2020), Heavy rains, human activity, and rising waters at Lake Victoria, Eos, 101, https://doi.org/10.1029/2020EO146582. Published on 07 July 2020.
32. Conway, D., 2002. Extreme rainfall events and lake level changes in East Africa: recent events and historical precedents. In The East African great lakes: limnology, palaeolimnology and biodiversity (pp. 63-92). Springer, Dordrecht.
33. Webster, P.J., Moore, A.M., Loschnigg, J.P. and Lebden, R.R. (1999) Coupled Ocean-Atmosphere Dynamics in the Indian Ocean During 1997-98. Nature 401, 356-360.
34. Nicholson SE (1999) Historical and modern fluctuations of lakes Tanganyika and Rukwa and their relationship to rainfall variability. Clim Change 41:53–71
35. Kull D (2006) Connections between recent water level drops in Lake Victoria, Dam operations and drought. http://www.irn.org/programs/nile/pdf/060208vic.pdf. Cited 18th May 2006.