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Abstract
Marginal grabens are the major development corridors in northern Ethiopia. Despite the growing pressure on water resources, the hydrological budget of the grabens is inadequately understood to develop better management options. The study investigates the water balance of the Aba’ala graben (553 km2) along the western margin of the Danakil depression. We established rain gauges, divers, and staff gauges to collect the required data. Climate, crop and soil data were also collected to compute actual evapotranspiration. Rating curves and hydrographs were developed to analyze the runoff components of the graben. The study shows that seasonal rainfall (521.5 Mm3) has an erratic behavior that led to 29.2 Mm3 runoff volume entering the Aba’ala bottom. The average rate of water flow was varied between the escarpment and graben outlet (P<0.00). Furthermore, the western escarpment contributes 13.49 Mm3 baseflow to the graben bottom. However, 25.2 Mm3 volume of flood runoff is lost through the outlet from the graben bottom. Besides, high actual evapotranspiration rates (312.61 Mm3) reduced moisture stress in the graben bottom. The deep percolation and storage share 38% of the water inflow into graben bottom. We underscore that better management of runoff components enhances water storage to build livelihood resilience of the graben communities.
Keywords
streamflow, hydrology, evapotranspiration, rating curve, hydrograph, Rift Valley, Afar

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Chicago
Gebregergs, Hailemariam Meaza, Amaury Frankl, Jean Poesen, Amanuel Zenebe, Veerle Van Eetvelde, Biadgilgn Demissie Mullaw, Tesfaalem-Ghebreyohannes Asfaha, Seppe Deckers, Dirk Raes, and Jan Nyssen. 2017. “Water Budget Variability in Aba’ala Marginal Graben of Northern Ethiopia.” In National Conference on “Integrated Geographical and Environmental Researches for Development” : Book of Abstracts.
APA
Gebregergs, H. M., Frankl, A., Poesen, J., Zenebe, A., Van Eetvelde, V., Mullaw, B. D., Asfaha, T.-G., et al. (2017). Water budget variability in Aba’ala marginal graben of Northern Ethiopia. National conference on “Integrated Geographical and Environmental Researches for Development” : book of abstracts. Presented at the National conference on Integrated Geographical and Environmental Researches for Development.
Vancouver
1.
Gebregergs HM, Frankl A, Poesen J, Zenebe A, Van Eetvelde V, Mullaw BD, et al. Water budget variability in Aba’ala marginal graben of Northern Ethiopia. National conference on “Integrated Geographical and Environmental Researches for Development” : book of abstracts. 2017.
MLA
Gebregergs, Hailemariam Meaza, Amaury Frankl, Jean Poesen, et al. “Water Budget Variability in Aba’ala Marginal Graben of Northern Ethiopia.” National Conference on “Integrated Geographical and Environmental Researches for Development” : Book of Abstracts. 2017. Print.
@inproceedings{8524062,
  abstract     = {Marginal grabens are the major development corridors in northern Ethiopia. Despite the growing pressure on water resources, the hydrological budget of the grabens is inadequately understood to develop better management options. The study investigates the water balance of the Aba{\textquoteright}ala graben (553 km2) along the western margin of the Danakil depression. We established rain gauges, divers, and staff gauges to collect the required data. Climate, crop and soil data were also collected to compute actual evapotranspiration. Rating curves and hydrographs were developed to analyze the runoff components of the graben. The study shows that seasonal rainfall (521.5 Mm3) has an erratic behavior that led to 29.2 Mm3 runoff volume entering the Aba{\textquoteright}ala bottom. The average rate of water flow was varied between the escarpment and graben outlet (P{\textlangle}0.00). Furthermore, the western escarpment contributes 13.49 Mm3 baseflow to the graben bottom. However, 25.2 Mm3 volume of flood runoff is lost through the outlet from the graben bottom. Besides, high actual evapotranspiration rates (312.61 Mm3) reduced moisture stress in the graben bottom. The deep percolation and storage share 38\% of the water inflow into graben bottom. We underscore that better management of runoff components enhances water storage to build livelihood resilience of the graben communities.},
  author       = {Gebregergs, Hailemariam Meaza and Frankl, Amaury and Poesen, Jean and Zenebe, Amanuel and Van Eetvelde, Veerle and Mullaw, Biadgilgn Demissie and Asfaha, Tesfaalem-Ghebreyohannes and Deckers, Seppe and Raes, Dirk and Nyssen, Jan},
  booktitle    = {National conference on 'Integrated Geographical and Environmental Researches for Development' : book of abstracts},
  keyword      = {streamflow,hydrology,evapotranspiration,rating curve,hydrograph,Rift Valley,Afar},
  language     = {eng},
  location     = {Mekelle, Ethiopia},
  title        = {Water budget variability in Aba{\textquoteright}ala marginal graben of Northern Ethiopia},
  year         = {2017},
}