Establishing The Environmental Flow Regime For The Middle Zambezi River

Author : Elenestina Mwelwa-Mutekenya
Publisher : CRC Press
ISBN 13 : 0429610726
Total Pages : 190 pages
Book Rating : 4.21/5 ( download)

DOWNLOAD NOW!

Download or read book Establishing the Environmental Flow Regime for the Middle Zambezi River written by Elenestina Mwelwa-Mutekenya and published by CRC Press. This book was released on 2021-07-28 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Middle Zambezi, host to a rich biodiversity, is located in the central part of the Zambezi River Basin which covers eight Southern African Countries. The area is located downstream of three hydropower schemes. In the last decades, the floodplain riparian tree, the Faidherbia albida, vital for the local wild life, has shown a worrying decrease in its regeneration rates. This thesis explores establishing the environmental flow regime for the Middle Zambezi reach in order to minimise the impact of the upstream hydropower schemes on the river environment, using the Faidherbia albida tree as a biological indicator. The research identified that the current dam operations have completely altered the natural hydrological rhythm from pre-Kariba dam dry season flows of 100-200 m3/s increasing to 1,000-1,500 m3/s. The sudden closure of the dam floodgates can be linked to the observed river channel-widening phenomenon. In addition, the Faidherbia albida tree now experiences longer flood residence over the floodplain, making it inaccessible to animals to allow for regeneration. In order to save the F. albida tree, a two-pronged environmental flow regime is proposed of releasing a moderate flood of 5,800 m3/s once in 5 years, for 5 to 6 weeks in the months of February to March, and phasing the spillway gates closure over a period of 3 to 4 weeks to keep the floodplain wet enough until the months of May and June. Phasing of the spillway gate closure would also mitigate the excessive bank erosion.

Author : Elenestina Mwelwa-mutekenya
Publisher : CRC Press
ISBN 13 : 9781138373501
Total Pages : 190 pages
Book Rating : 4.08/5 ( download)

DOWNLOAD NOW!

Download or read book Establishing the Environmental Flow Regime for the Middle Zambezi River written by Elenestina Mwelwa-mutekenya and published by CRC Press. This book was released on 1920-03-31 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Middle Zambezi, host to a rich biodiversity, is located in the central part of the Zambezi River Basin which covers eight Southern African Countries. The area is located downstream of three hydropower schemes. In the last decades, the floodplain riparian tree, the Faidherbia albida, vital for the local wild life, has shown a worrying decrease in its regeneration rates. This thesis explores establishing the environmental flow regime for the Middle Zambezi reach in order to minimise the impact of the upstream hydropower schemes on the river environment, using the Faidherbia albida tree as a biological indicator. The research identified that the current dam operations have completely altered the natural hydrological rhythm from pre-Kariba dam dry season flows of 100-200 m3/s increasing to 1,000-1,500 m3/s. The sudden closure of the dam floodgates can be linked to the observed river channel-widening phenomenon. In addition, the Faidherbia albida tree now experiences longer flood residence over the floodplain, making it inaccessible to animals to allow for regeneration. In order to save the F. albida tree, a two-pronged environmental flow regime is proposed of releasing a moderate flood of 5,800 m3/s once in 5 years, for 5 to 6 weeks in the months of February to March, and phasing the spillway gates closure over a period of 3 to 4 weeks to keep the floodplain wet enough until the months of May and June. Phasing of the spillway gate closure would also mitigate the excessive bank erosion.

Author : Mzime Ndebele-Murisa
Publisher : African Books Collective
ISBN 13 : 2382340215
Total Pages : 262 pages
Book Rating : 4.19/5 ( download)

DOWNLOAD NOW!

Download or read book Ecological Changes in the Zambezi River Basin written by Mzime Ndebele-Murisa and published by African Books Collective. This book was released on 2021-01-11 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an analysis of the ecological conditions and ecosystem goods and services of the Zambezi River Basin (ZRB), the fourth largest river in Africa. Various environmental and anthropogenic factors; inclusive of climate, environmental flows, hydrology, morphology, pollution and land use changes among others and their interactions are considered as drivers of the river ecosystems. The impacts of these drivers on aquatic biota, river ecological integrity, and the livelihoods of surrounding communities are analysed within the socio-economic-policy context. The book goes beyond the usual inventories and basic research by using the comparative research method (CRM) in a trans-disciplinary manner. This CRM analytical approach in this book seeks to interrogate the differences or similarities in socio-economic systems, livelihoods, ecological systems, ecosystem goods and services, their usage and management under the seemingly different cultural, socio-economic conditions expected across boarders that are within the ZRB. The multidisciplinary approach also connects the typical ecological research with social dimensions in a holistic manner. The book therefore, provides empirical and research based evidence to support strategic planning and policy development in the wake of ecological changes that nations and indeed regions such as the ZRB are grappling with while seeking to sustainably manage precious river systems.

Author : Smakhtin, Vladimir
Publisher : IWMI
ISBN 13 : 9290906197
Total Pages : 19 pages
Book Rating : 4.93/5 ( download)

DOWNLOAD NOW!

Download or read book An assessment of hydrology and environmental flows in the Walawe River Basin, Sri Lanka written by Smakhtin, Vladimir and published by IWMI. This book was released on 2005 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantification of hydrological processes and water requirements of aquatic ecosystems is required for many projects related to environmental security and efficient water use in agriculture. This also applies to the Asian monsoon region. This paper focuses on the Walawe River basin, located in a semi-arid zone of southern Sri Lanka. The two major reservoirs in the upstream and middle reaches of the river with a total capacity of 486 million cubic meters (MCM) have significantly affected the hydrology of the river, with associated adverse environmental and social consequences.

Author : Vladimir Smakhtin
Publisher : IWMI
ISBN 13 : 9290905425
Total Pages : 32 pages
Book Rating : 4.24/5 ( download)

DOWNLOAD NOW!

Download or read book Taking Into Account Environmental Water Requirements in Global-scale Water Resources Assessments written by Vladimir Smakhtin and published by IWMI. This book was released on 2004 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : McCartney, M.
Publisher : IWMI
ISBN 13 : 9290907630
Total Pages : 64 pages
Book Rating : 4.33/5 ( download)

DOWNLOAD NOW!

Download or read book Evaluating the flow regulating functions of natural ecosystems in the Zambezi River Basin written by McCartney, M. and published by IWMI. This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: By affecting evapotranspiration and influencing how water is routed and stored in a basin, forests, wetlands and floodplains play a crucial role in the hydrological cycle. Although they are widely attributed a major role in regulating flows (i.e., both attenuating floods and maintaining flow during dry periods), these services are rarely factored into the planning and management of water resources. One reason for the failure to include them is lack of understanding. Very often the extent to which natural regulating functions really occur is unclear. Against this background, this report describes a simple, pragmatic approach for quantifying the flow regulating functions of natural ecosystems. The method has been applied at 14 locations in the Zambezi River Basin.

Author : Jonathan Lautze
Publisher : Routledge
ISBN 13 : 1315282038
Total Pages : 359 pages
Book Rating : 4.39/5 ( download)

DOWNLOAD NOW!

Download or read book The Zambezi River Basin written by Jonathan Lautze and published by Routledge. This book was released on 2017-07-28 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Zambezi river is the fourth longest in Africa, crossing or bordering Zambia, Angola, Namibia, Botswana, Zimbabwe and Mozambique. The river basin is widely recognised as one of the most important basins in southern Africa and is the focus of contested development, including water for hydropower and for agriculture and the environment. This book provides a thorough review of water and sustainable development in the Zambezi, in order to identify critical issues and propose constructive ways forward. The book first reviews the availability and use of water resources in the basin, outlines the basin’s economic potential and highlights key concerns related to climate vulnerability and risk. Focus is then devoted to hydropower and the water-energy-food (WEF) nexus, sustainable agricultural water management, and threats and opportunities related to provision of ecosystem services. The impact of urbanisation and water quality is also examined, as well as ways to enhance transboundary water cooperation. Last, the book assesses the level of water security in the basin, and provides suggestions for achieving Sustainable Development Goal (SDG) 6. Throughout, emphasis is placed on entry points for basin-level management to foster improved paths forward.

Author : Jacqulene Mary King
Publisher :
ISBN 13 : 9781770057210
Total Pages : 339 pages
Book Rating : 4.18/5 ( download)

DOWNLOAD NOW!

Download or read book Environmental Flow Assessments for Rivers written by Jacqulene Mary King and published by . This book was released on 2008 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author :
Publisher : WorldFish
ISBN 13 : 9832346606
Total Pages : 93 pages
Book Rating : 4.09/5 ( download)

DOWNLOAD NOW!

Download or read book Proceedings of the International Workshop on the Fisheries of the Zambezi Basin written by and published by WorldFish. This book was released on 2007 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : M.J. Tumbare
Publisher : CRC Press
ISBN 13 : 1000446522
Total Pages : 247 pages
Book Rating : 4.24/5 ( download)

DOWNLOAD NOW!

Download or read book Management of River Basins and Dams written by M.J. Tumbare and published by CRC Press. This book was released on 2021-04-30 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Zambezi river basin is the fourth largest river basin in Africa and drains a total of some 1350.000 square km. The basin drains eight countries: Angola, Botswana, Malawi, Mozambique, Namibia, Tanzania, Zambia and Zimbabwe. The river flows over the famous Victoria Falls into the third largest artificial lake in the world: Lake Kariba. The Zambezi Basin is rich in natural resources and has a large hydro-power potential. This volume contains 37 papers which have been published in international journals, or presented at international conferences by the Zambezi River Authority staff. The topics covered include: Dam Safety, Rehabilitation and Maintenance, Environment and Health, Hydrology, Limnology, Information Systems, Water Resource Management, Hydropower Development and Socio-Economic Issues.