Evaluation of current and future water resources development in the Lake Tana Basin, Ethiopia
Evaluation of current and future water resources development in the Lake Tana Basin, Ethiopia

Author: McCartney M. , Alemayehu T. , Shiferaw A. , Awulachew S.

Publisher: IWMI

Published: 2010

Total Pages: 44

ISBN-13: 9290907215

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Lake Tana, located in the headwaters of the Blue Nile, is valuable for many people including the communities who live around the lakeshore and those who live immediately downstream. The area has been identified as a region for hydropower and irrigation development, vital for economic growth in Ethiopia. A multidisciplinary study was conducted to assess the possible impacts of this development. This study found that current development has benefited some local people but adversely affected others. Future development will exacerbate pressure on the lake. Hard choices must be made about how the water is best utilized. It is important that all stakeholders, including local people, are involved in the decision-making process.

Social and Ecological System Dynamics
Social and Ecological System Dynamics

Author: Krystyna Stave

Publisher: Springer

Published: 2017-04-06

Total Pages: 645

ISBN-13: 3319457551

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This book is a social—ecological system description and feedback analysis of the Lake Tana Basin, the headwater catchment of the Upper Blue Nile River. This basin is an important local, national, and international resource, and concern about its sustainable development is growing at many levels. Lake Tana Basin outflows of water, sediments, nutrients, and contaminants affect water that flows downstream in the Blue Nile across international boundaries into the Nile River; the lake and surrounding land have recently been proposed as a UNESCO Biosphere Reserve; the basin has been designated as a key national economic growth corridor in the Ethiopian Growth and Transformation Plan. In spite of the Lake Tana Basin’s importance, there is no comprehensive, integrated, system-wide description of its characteristics and dynamics that can serve as a basis for its sustainable development. This book presents both the social and ecological characteristics of the region and an integrated, system-wide perspective of the feedback links that shape social and ecological change in the basin. Finally, it summarizes key research needs for sustainable development.

Modélisation Hydrosédimentaire Dans Le Bassin Versant Du Lac Tana en Ethiopie
Modélisation Hydrosédimentaire Dans Le Bassin Versant Du Lac Tana en Ethiopie

Author: Agizew Nigussie Engida

Publisher:

Published: 2010

Total Pages: 230

ISBN-13:

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This study is conducted in Lake Tana basin located in the Upper Blue Nile Basin in Ethiopia where water resources issues are critical and availability of relevant data is poor. The study is divided into three major components that include evaluation and analysis of the existing data, evaluation of the applicability of a physically-based distributed hydrological model and water and suspended sediment balance modeling for Lake Tana. The temporal and spatial coverage of various hydro-meteorological variables was assessed in light of recommended practices in the literature. Analyses of the hydro-meteorological datasets comprised data quality control, and determination of their characteristics in space and time. The applicability of the fully distributed physically-based hydrological model was assessed on selected catchments. The modeling exercise revealed the importance of weather data disaggregation models in generating meteorological forcings at finer time scales. Considering the quality and resolution of the inputs used, the performance of the distributed model could be judged satisfactory in two of the selected mesoscale catchments. The water balance modeling of Lake Tana was done at a monthly time step and involved estimation of the major inflow and outflow components. A dynamic conceptual model was used to estimate the contribution of catchments for which data could not be obtained. The results of the water balance model at monthly and annual time scales was generally good and the observed lake levels could be reproduced satisfactorily. Estimation of the suspended sediment balance of the lake involved development and use of rating curves and a regional area-specific model. The results of the study are useful for planning and management of water resources in the study area.

Social and Ecological System Dynamics
Social and Ecological System Dynamics

Author: Krystyna Stave

Publisher: Springer

Published: 2018-07-18

Total Pages: 0

ISBN-13: 9783319833651

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This book is a social—ecological system description and feedback analysis of the Lake Tana Basin, the headwater catchment of the Upper Blue Nile River. This basin is an important local, national, and international resource, and concern about its sustainable development is growing at many levels. Lake Tana Basin outflows of water, sediments, nutrients, and contaminants affect water that flows downstream in the Blue Nile across international boundaries into the Nile River; the lake and surrounding land have recently been proposed as a UNESCO Biosphere Reserve; the basin has been designated as a key national economic growth corridor in the Ethiopian Growth and Transformation Plan. In spite of the Lake Tana Basin’s importance, there is no comprehensive, integrated, system-wide description of its characteristics and dynamics that can serve as a basis for its sustainable development. This book presents both the social and ecological characteristics of the region and an integrated, system-wide perspective of the feedback links that shape social and ecological change in the basin. Finally, it summarizes key research needs for sustainable development.

Assessment of Causes and Impacts Of Flooding On Agricultural Production of Plains Surrounding Lake Tana, Ethiopia
Assessment of Causes and Impacts Of Flooding On Agricultural Production of Plains Surrounding Lake Tana, Ethiopia

Author: Yirga Alemu Azene

Publisher: GRIN Verlag

Published: 2020-11-26

Total Pages: 165

ISBN-13: 3346304671

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Master's Thesis from the year 2007 in the subject Agrarian Studies, grade: Very Good, , course: Irrigation Engineering, language: English, abstract: This study is an attempt to identify the main causes and effect of flooding on agricultural production and the peoples living in the Lake Tana surroundings. Although floods are relatively common during the June to September rainy season in Ethiopia, the magnitude of the current flooding in 2006 is unprecedented. In year 2006 the country has experienced some of the heaviest and most intense rains on record; resulting in flash floods and/or the overflow of rivers, lakes and dams, where local residents have been advised to leave. The impact of the disaster in terms of lives, infrastructure, livelihoods, and basic coping mechanisms has yet to be assessed The rainfall variability analysis of the Lake Tana (LT) basin in 2006 showed an on average 43% increase in wet season rainfall than the normal (mean). All rainfall gauging stations show an increase in rainfall in 2006. Similarly, the variability analysis of major rivers also showed that on average 35% increase in flood season streamflow of G/Abay, Gumara, Rib, Megech, and Koga. The trend of these rivers shows that maximum runoff for the year 2006 was higher than the mean of the long term maximum flood. Whereas Lake Tana maximum flood level of 2006 (1787.155masl) shows an increase of 16 cm only from the mean flood levels of previous records (1787 masl). The Pearson III method of the moment probability distribution is the best fit for Megech and Rib rivers. For Gumara river Pearson III probability weighted moment distribution better estimate flood quantiles with less standard error. It is also found that Gamma two probability weighted moment is the best fit for Lake Tana water surface level. In general, from rainfall and flood frequency analysis the 2006-year flooding may have a chance to occur once in six years in LTB. The 2006-year flood damage indicates that there is a high impact on agricultural production of Lake Tana surrounding plains. 107,647 peoples were actually affected by floods. At least 448, 910 quantal of food grain, 1230 domestic animals, 9634 chickens, and 1088 bee-hives were damaged by the 2006 flood. The impacts of flooding on socio-economic and environmental resource indicators were qualitatively assessed. Totally twenty-seven indicators were assessed.