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Towards an ecohydrology-based restoration of the Usangu wetlands and the Great Ruaha River, Tanzania

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An open channel flow model, calibrated against field data, suggests that cattle intrusion in the eastern Usangu wetlands, as well as both dry and wet weather irrigation upstream, are responsible for the seasonal drying out of the Great Ruaha River (GRR) downstream. This human-induced change has severe socio-economic implications downstream, including hindering hydroelectricity production, as well as a devastating impact on the Ruaha National Park (RNP) ecosystem that is now shifting from wet tropics to dry tropics. To ensure sustainable development, governance is urgently needed for the Usangu catchment in a way that is compatible with ecohydrology principles for the sustainable use of water resources. In order to do that, perennial flow must be restored to the GRR. For this to happen this study suggests that all the livestock must be removed from the eastern Usangu wetlands and dry weather irrigators must return at least 25% (∼4 m3 s−1) of the water to the river.

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  • Arcement Jr. G.J. and Schneider V.R. 2004. Guide for Selecting Manning’s Roughness Coefficients for Natural Channels and Flood Plains. United States Geological Survey Water-supply Paper 2339, Washington DC, 67 pp

  • Bauer P., Thabeng G., Stauffer F., Kinzelbach W. (2004). Estimation of the evapotranspiration rate from diurnal groundwater level fluctuations in the Okavango Delta, Botswana. J. Hydrol. 288: 344–355

    Article  Google Scholar 

  • Bullock A., Acreman M. (2003). The role of wetlands in the hydrologic cycle. Hydrol. Earth Syst. Sci. 7: 358–389

    Article  Google Scholar 

  • Chanson H. (2004). The Hydraulics of Open Channel Flows: An Introduction. Butterworth-Heinemann, Oxford UK 2nd edition, 585 pp

    Google Scholar 

  • Coppolillo P.B., Kashaija L., Moyer D.C. and Knap E. 2004. Technical Report on Water Availability in the Ruaha River and the State of Usangu Game Reserve, November 2003. Wildlife Conservation Society and WWF-Tanzania Program

  • Crisman T.L., Chapman L.J., Chapman C.A., Kaufman L.S. (2003). Conservation, Ecology, and Management of African Fresh Waters. University Press of Florida, Gainesville, 514 pp

    Google Scholar 

  • Confederation of Tanzania Industries. 2004. The Industrialization of Tanzania: Towards Poverty Alleviation. The Economic and Social Research Foundation, DANIDA. Dar Es Salaam

  • de Villiers M. (2000). Water: The Fate of our Most Precious Resource. Houghton Mifflin Company, Boston, 352 pp

    Google Scholar 

  • Gereta E., Wolanski E., Borner M., Serneels S. (2002). Use of an ecohydrological model to predict the impact on the Serengeti ecosystem of deforestation, irrigation and the proposed Amala weir water diversion project in Kenya. Ecohydrol. Hydrobiol. 2:127–134

    Google Scholar 

  • Harper D.M., Mavuti K.M. (2004). Lake Naivasha, Kenya: ecohydrology to guide the management of a tropical protected area. Ecohydrol. Hydrobiol. 4:287–305

    Google Scholar 

  • Lankford B., van Koppen B., Franks T., Mahoo H. (2004). Entrenched views or insufficient science? Contested causes and solutions of water allocation; insights from the Great Ruaha River Basin, Tanzania. Agric. Water Manage. 69:135–153

    Article  Google Scholar 

  • McCarthy T.S., Ellery W.N. (1995). Sedimentation on the distal reaches of the Okavango Fan, Botswana, and its bearing on calcrete and silcrete (ganister) formation. J. Sediment. Res. 65:77–90

    Google Scholar 

  • Mohamed Y.A., Savenije H.H.G., Bastiaanssen W.G.M., van den Hurk B.J.J.M. (2005). New lessons on the Sudd hydrology learned from remote sensing and climate modelling. Hydrol. Earth Syst. Sci. Discuss. 2:1503–1535

    Google Scholar 

  • Moyer D.C. 2000. Avian Biodiversity of Ihefu swamp and floodplains in Usangu, Tanzania. Report to UK Department for International Development

  • Petryk S., Bosmajan G. (1975). An analysis of flow through vegetation. J. Hydraul. Div., Am. Soc. Civil Eng. 101: 871–874

    Google Scholar 

  • Postel S., Richter B. (2003). Rivers for Life: Managing Water for People and Nature. Island Press, Washington, D.C., 220 pp

    Google Scholar 

  • President’s Office. 2004. The Economic Survey 2004. The United Republic of Tanzania, Planning and Privatisation. Dar Es Salaam

  • SMUWC. 2002. The Sustainable Management of the Usangu Wetland and its Catchment. September 1998–March 2003. 20 volumes. UK Department of International Development and Ministry of Water and Livestock, Dar Es Salaam

  • Sosovele H. and Ngwale J.J. 2002. Socio- Economic Root Causes of the Loss of Biodiversity in the Ruaha Catchment Area. Report submitted to WWF – Tanzania

  • Wolanski E., Gereta E. (1999). Oxygen cycles in a hippo pool, Serengeti National Park, Tanzania. Afr. J. Ecol. 37:419–423

    Article  Google Scholar 

  • Wolanski E., Jones M., Bunt J.S. (1980). Hydrodynamics of a tidal creek-mangrove swamp system. Aust. J. Mar. Freshwater Res. 31:431–450

    Article  Google Scholar 

  • Wolanski E., Spagnol S., Thomas S., Alongi D.M., Trott L., Davidson A. (2000). Modelling and visualising the fate of shrimp pond effluent in a tidally flushed mangrove creek. Estuar.Coast. Shelf Sci. 50:85–97

    Article  CAS  Google Scholar 

  • Zalewski M. (2002). Ecohydrology – the use of ecological and hydrological processes for sustainable management of water resources. Hydrol. Sci. Bull. 47: 823–832

    Article  Google Scholar 

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Correspondence to E. Gereta.

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Mtahiko, M.G.G., Gereta, E., Kajuni, A.R. et al. Towards an ecohydrology-based restoration of the Usangu wetlands and the Great Ruaha River, Tanzania. Wetlands Ecol Manage 14, 489–503 (2006).

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