A Synthesis of Surface Water Quality in Awash Basin, Ethiopia

Abstract

Developing countries like Ethiopia are grabbling with rapid population growth, urbanization, agricultural intensification, and climate change which put intense pressure on the availability and quality of water resources. The surface water quality degradation is exacerbating due to increasing urbanization and agricultural activities. The average annual fertilizer use in Ethiopia increased from 132,522 metric tons (mt) in 1996 to 858,825 mt in 2015. Pesticide use also increases significantly from 3,327.7 mt/y in 2006 to 4,211.5 mt/y in 2010. The Awash river is one of the most affected rivers by intensified irrigation schemes, industrial, and urbanization pollution. The Awash river and its tributaries are used for domestic, irrigation, industrial, and recreational purposes. However, as per Canadian water quality indices for the drinking and irrigation water quality, the upper Awash basin scored 34.79, and 46.39, respectively, in the poor and marginal categories; whereas the middle/lower basin indicated 32.25 and 62.78 in poor and marginal ranges, respectively. Dissolved phosphorous in the headwater tributaries is about 0.51 mg/l which is beyond the threshold (0.15 mg/l). The surface water quality impairment is severe in the upper Awash basin where more than 90% of Addis Ababa's industries discharge their waste into nearby waterways without treatment; about 30% of the population lacks access to a liquid waste disposal and treatment facility; only 16% of the population is connected to sewage system, and 25% of the total waste generated enters freshwater systems without treatment. Many studies on surface water quality are reviewed and many of them are inconclusive for a number of reasons. For example, no comprehensive surface water quality research, lack of detailed combined spatial and temporal surface water quality data, and analysis to show the overall picture of the basin are a few of them. Despite the existence of the policy and legal tools, enforcement is lacking. Improving the ecological health of rivers necessitates policy revision as well as increased knowledge and engagement among implementers.

Vulnerability Assessment and Protection Zone Delineation for Water Supply Schemes in the Upper Awash Subbasin, Ethiopia, Sub-Saharan Africa

“…This absence, coupled with challenges such as urbanization, intensive agriculture, industrialization, water pollution, deforestation, and climate change in the Upper Awash River subbasin, emphasizes the critical need for proactive measures. 5 , 6 The urgency of addressing drinking water risks in polluted and sociopolitically significant subbasins highlights the motivation behind this study. The key factors driving this research include safeguarding public health, promoting sustainable water management, enhancing decision-making, reducing economic burdens, ensuring regulatory compliance, raising public awareness, and facilitating long-term planning.…”

Enhancing Oil–Water Separation Efficiency with WO3/MXene Composite Membrane

“…Industrial activities often contribute to water pollution through leaks of organic solvents [6]. Traditional pollution treatment methods often face limitations, such as high costs, operational complexity, and environmental concerns.…”

Ecosystem Service of Urban Green and Blue Spaces Towards Sustainable Urban Ecosystem: A Systematic Review

“…The impact of nitrogen and phosphorus on surface water quality is an increasing problem in developing countries [8]. industrialization and agricultural activities Direct discharge of industrial wastewater to soil surface or water bodies severely contaminates the environment [9]. Therefore, it is necessary to give treatment to disposed water before letting it off as effluent, to avoid contamination of natural system.…”