Assessing the impact of existing and future water demand on econo | 34155
Journal of Geology & Geophysics

Journal of Geology & Geophysics
Open Access

ISSN: 2381-8719

+44 1478 350008

Assessing the impact of existing and future water demand on economic and environmental aspects (case study from Rift Valley Lake Basin: Meki-Ziway Sub Basin), Ethiopia

International Conference on Geosciences and Geophysics

October 06-07, 2016 Orlando, USA

Abebe Guadie Shumet and Kassa Tadele Mengistu

Arba Minch University, Ethiopia
Swiss Institute of Technology, Switzerland

Posters & Accepted Abstracts: J Geol Geophys

Abstract :

In the development of water resource projects, there is an increase and extensive use of water resources which cause exploitation of the existing systems and ecosystem of the natural environment. The water evaluation and planning (WEAP) model is used to assess water demand by considering the existing development situation and future water resources development with scenarios analysis in the study area (Ziway-Meki Sub Basin, Ethiopia). Three different development scenarios were developed to simulate water use at demand sites. In the simulations, the catchment was divided into 5 main sub-catchments where the supply and demand nodes were spatially located. The competing water sectors were irrigation development, domestic users, soda ash industry and environmental flow requirements. Hydro-meteorological data, net evaporation from Lake Reservoir, and monthly water demand from user sectors were the basic inputs to the model. The results of the reference scenario were validated using observed flows, and the simulation results revealed that the total average annual inflow volume into the study area declined significantly for reference scenarios; and water availability was limited in the month of January (17 Mm3) and December (171 Mm3). While in other months, the availability was efficient and all users had 100% coverage; except Langano irrigation site, which had between 33.33% to 86.5% coverage in average during the month of Feb to May (2.57 Mm3) and April in Bulbula 95.2% coverage. The minimum reliability observed mostly in the ongoing and likely future development scenarios at Bulbula irrigation demand sites which had 92.11% and 66.67% reliability in Langano irrigation demand sites throughout over all development scenarios, while in Sher-Ethiopia expansion, 51.75% reliability was observed in ongoing and likely future development scenarios and in demand site of Katar irrigation. Diversion and Meki irrigation from dam 51.75% was observed in likely future development scenarios.

Biography :