This study focuses on characterization of Emerging Organic Contaminants (EOCs) in the Awash River basin. Characterization of the EOCs was supplemented by chemical analysis of samples from river, boreholes, tap water, and surface water reservoirs. Analyses of environmental isotopes (δ 2 H, δ 18 O, and 222Rn) were used to investigate the exchange of contaminants between surface and groundwater supply sources. The analysis showed new types of contaminants in the water supply sources with potential impact on human and wider environmental health.
Water Quality
Demystifying Heavy Metals and Physicochemical Characteristics of Groundwater in a Volcano-Tectonic Region of Middle Awash, Ethiopia, for Multipurpose Use
This study investigates the concentrations of physicochemical and heavy metal contaminants in the groundwater of the Middle Awash Basin, Ethiopia, to inform targeted water management strategies. After collecting groundwater samples during both the dry (June) and wet (October) seasons of 2021, the study found significant levels of contamination, including extraordinarily high concentrations of total dissolved solids and electrical conductivity. Over half of the groundwater sources were unsuitable for drinking, posing significant health risks to local communities that rely heavily on these sources due to limited access to clean surface water. These findings highlight the urgent need for comprehensive groundwater management and remediation plans in the Middle Awash region to ensure safe and sustainable water use.
Improving water security through a Science-Practitioner Partnership with UNICEF
UNICEF has been a global, regional and national partner with REACH since 2015. A science-practitioner partnership was one of three foundations informing REACH’s work to improve water security for millions of poor people in Africa and Asia. The partnership aimed to...
Reinforcing Feedbacks for Sustainable Implementation of Rural Drinking-Water Treatment Technology
Water safety management is a key factor that rural service delivery models must incorporate if they are to achieve universal access to safe drinking water. Practices such as source protection and water treatment help reduce the risk of fecal contamination. Therefore, this study recognises the importance of water treatment, assessing the implementation of passive chlorination and ultraviolet (UV) disinfection technologies in rural parts of South America, Africa, and Asia. The results identify a series of leverage points which highlight the need for fit-for-purpose intervention design reinforced by collaboration between facilitating actors through hybrid service delivery models.
Multibranch Modelling of Flow and Water Quality in the Dhaka River System, Bangladesh: Impacts of Future Development Plans and Climate Change
The rivers of Dhaka, Bangladesh, suffer high levels of pollution from untreated sewage and industrial effluent. To address this, over the next 20 years, the government is planning to install 12 large Sewage Treatment Plants (STPs) across the Dhaka River System. This paper applies a water quality model to assess the efficacy of this planned investment. The model suggests that the STPs will improve water quality in the most densely populated areas of the city along the Turag and Buriganga rivers, and in some other parts of the city (Tongi Khal). However, future upgrades will be needed to improve dissolved oxygen levels more widely, due to predicted population growth. Policies to reduce industrial pollution should also be pursued.
Environmental isotopes (δ 18O–δ 2H, 222Rn) and electrical conductivity in backtracking sources of urban pipe water, monitoring the stability of water quality and estimating pipe water residence time
In this paper, environmental isotopes and electrical conductivity are used to investigate water quality variations in the urban piped water network of Addis Ababa, Ethiopia. The isotopic signature of the water allows the back-tracking of tap water to its source and also provides insights into pipe water residence time for groundwater-sources supplies. The tracers reveal that 50% of the city relies on groundwater, and that groundwater-sourced water supplies show the highest water quality instability. One important cause of water quality variation in the city is borehole stoppages and reconnection as a result of electricity cuts.
Evaluating the effects of geochemical and anthropogenic factors on the concentration and treatability of heavy metals in Awash River and Lake Beseka, Ethiopia: arsenic and molybdenum issues
This study assesses heavy metal and pollution sources within the Awash River Basin, in Ethiopia. In this region, significant urbanization and industrialization have caused pollutants to enter water bodies on a large scale. After finding high levels of heavy metals across surface water sampling stations, the study advocates for increased efforts towards water security within the Addis Ababa and Awash watershed region.
Evaluating the structures and arrangements of water institutions to include in-stream modeling for water quality management and control pollution: Insights from the Awash Basin, Ethiopia
In sub-Saharan regions, human activities are causing stream water quality to decline. This study assesses stream water quality issues in the Awash Basin of Ethiopia, identifying key sources of land-based pollutants. Applicable models with the capability of simulating the Awash streams are presented, and recommendations towards improved use of water quality modelling for development planning by Awash Basin institutions are made.
Information synthesis to identify water quality issues and select applicable in-stream water quality model for the Awash River basin in Ethiopia: A perspective from developing countries
In-stream water quality models can help prepare effective planning strategies to tackle problems with stream water quality and understand pollutant dynamics in stream systems. In this study, water quality issues in the Awash Basin were reviewed to select an applicable in-stream model to support local model practitioners in creating improvement in water quality management. QUAL2KW and INCA models are found more applicable for the present conditions, while the WASP model may be useful to conduct detailed analysis.
Opportunities to advance water safety through regulation of rural water services
Despite improved access to water supply systems globally, safe drinking water continues to limit progress towards Sustainable Development Goal 6.1. In particular, there is a disparity between access to uncontaminated water in rural and urban areas, with the former significantly lagging behind. In this discussion paper, researchers and practitioners in rural drinking water provision, management and regulation from Bangladesh, Kenya, England and Wales identify key aspects to advance regulation for rural drinking water services.
