Research Article
Evaluations of Shallow Groundwater Recharges and Water Use Practices at Robit Watershed
@INPROCEEDINGS{10.1007/978-3-030-93712-6_3, author={Dagnew Y. Takele and Seifu A. Tilahun and Fasikaw A. Zimale and Petra Schmitter and Bayu G. Bihonegn and Daniel G. Eshetie}, title={Evaluations of Shallow Groundwater Recharges and Water Use Practices at Robit Watershed}, proceedings={Advances of Science and Technology. 9th EAI International Conference, ICAST 2021, Hybrid Event, Bahir Dar, Ethiopia, August 27--29, 2021, Proceedings, Part II}, proceedings_a={ICAST PART 2}, year={2022}, month={1}, keywords={Water abstraction survey PLANETSCOPE image ERDAS IMAGINE QSWAT GW recharges CROPWAT SWATCUP}, doi={10.1007/978-3-030-93712-6_3} }- Dagnew Y. Takele
Seifu A. Tilahun
Fasikaw A. Zimale
Petra Schmitter
Bayu G. Bihonegn
Daniel G. Eshetie
Year: 2022
Evaluations of Shallow Groundwater Recharges and Water Use Practices at Robit Watershed
ICAST PART 2
Springer
DOI: 10.1007/978-3-030-93712-6_3
Abstract
Groundwater resources have a fundamental importance to satisfy the rapidly increasing agricultural, livestock and domesticwater requirements within the region especially in Robit watershed. Hence the quantification of this water resource is important for the efficient and sustainable water resource management. In this study spatial variability of irrigation water requirement, water use (abstractions) and groundwater recharge were estimated for Robit watershed within the eastern part of Lake Tana. Satellite image of Planet Scope on 2nd February 2017 was used to estimate area and type of crops cultivated in the watershed. CROPWAT model has been used to calculate the particular evapotranspiration and water requirement for irrigation using local climatic data. This was calculated for the dominant irrigated crops of Khat (Catha edulis Forsk), hop (Rhamnus prinoides), coffee, tomato and green pepper within the study area. Calibrated QSWAT model was applied to estimate net ground water recharges using local climatic data, soil map, crop management data and derived land use map from satellite image processing. The assessment showed that the entire amount of water applied for irrigation, domestic and livestock purposes was estimated as 1.35 Mm3/year, 0.02 Mm3/year and 0.03 Mm3/year respectively. Net groundwater recharge was estimated as 3.18 Mm3/year within the watershed. The estimation from the water abstraction survey showed that the total volume of water abstracted within the watershed was estimated as 1.40 Mm3/year. From the assessment it can be clearly seen that only 44% of ground water resource is extracted annually within the area and there is some potential to expand irrigation areas and the current water usage for various purposes in the future.
