4 research outputs found

    Accuracy of satellite and reanalysis rainfall estimates over Africa: A multi-scale assessment of eight products for continental applications

    No full text
    Study Region: Continental Africa Study Focus: This study evaluates the accuracy of eight gauge-corrected rainfall products across Africa through direct comparisons with in situ observations for the period 2001–2020. The effect of validation datasets on the performance of the rainfall products was also quantified in ten African countries. Four categorical and five continuous metrics were estimated at multiple spatial and temporal scales as part of the evaluation. New hydrological insights for the Region: Results indicate that the performance of the rainfall products varied in space and time. Evaluation at temporal scales revealed that, on average, most rainfall products showed poor results (KGE 0.75) at the monthly and annual timescales. Among the rainfall products, the performance of TAMSATv3.1, PERSIANN-CDR, and ERA 5 was relatively poor in capturing in situ observations. Evaluation at various spatial scales revealed mixed results. The ARC v2.0 and CHIRPS v2.0 rainfall products were reliable in detecting no rains (< 1 mm/day) for all 19 spatial scales, indicating a high level of confidence for drought studies. IMERG-F v6B and RFE v2.0 were reliable in detecting heavy and high-intensity rainfall events for all spatial scales. Using the KGE performance metrics at the regional level, MSWEP v2.8 in the Northern Africa region, RFE v2.0 in the Western and Southern Africa regions, ARC v2.0 in Central Africa, and CHIRPS v2.0 in the Eastern Africa region showed better performances at monthly timescale. Moreover, the performance of the gauge-corrected rainfall datasets was reduced when compared with independent validation data (gauge data not used by rainfall products) than dependent validation data. This study provides several new insights into choosing a rainfall product for continental to regional applications and identifies the need for bias correction

    Metals Exposures of Residents Living Near the Akaki River in Addis Ababa, Ethiopia: A Cross-Sectional Study

    No full text
    Background. The Akaki River in Ethiopia has been found to contain elevated levels of several metals. Our objectives were to characterize metals exposures of residents living near the Akaki River and to assess metal levels in their drinking water. Methods. In 2011, we conducted a cross-sectional study of 101 households in Akaki-Kality subcity (near the Akaki River) and 50 households in Yeka subcity (distant to the Akaki River). One willing adult in each household provided urine, blood, and drinking water sample. Results. Urinary molybdenum (p<0.001), tungsten (p<0.001), lead (p<0.001), uranium (p<0.001), and mercury (p=0.049) were higher in Akaki-Kality participants compared to Yeka participants. Participants in both subcities had low urinary iodine; 45% met the World Health Organization (WHO) classification for being at risk of moderate iodine deficiency. In Yeka, 47% of households exceeded the WHO aesthetic-based reference value for manganese; in Akaki-Kality, only 2% of households exceeded this value (p<0.001). There was no correlation between metals levels in water samples and clinical specimens. Conclusions. Most of the exposures found during this investigation seem unlikely to cause acute health effects based on known toxic thresholds. However, toxicity data for many of these metals are very limited

    Level of JMP ladders for water, sanitation, and hygiene (WASH) services among healthcare facilities of Bishoftu Town, Ethiopia: An implication of healthcare-associated infection prevention status

    No full text
    This study aimed to assess the level of JMP ladders for WASH services. A cross-sectional study was conducted. Forty-four healthcare facilities were enrolled. From each healthcare facility, water samples were collected directly from water storage facilities. In addition to the interview, an observational checklist was used. Descriptive statistics and a chi-square test were conducted to analyze the data. The coverage of advanced and basic drinking water services in healthcare facilities was 4.6 and 70.4%, respectively. However, the healthcare facilities’ access to advanced and basic sanitation services was nil. Similarly, 61.4 and 88.6% of the healthcare facilities had no hygiene and waste disposal services, respectively. While 2.6, 4.5, and 75% of healthcare facilities had advanced, basic, and limited environmental cleaning services, 18.2% lacked environmental cleaning services. Water samples of 15.9, 11.4, and 6.8% of the healthcare facilities were found positive for total coliforms, fecal coliforms, and E. coli, respectively. The WASH services of the healthcare facilities were very low and not on track to achieve the Sustainable Development Goal target. Healthcare facilities could be sources of healthcare-associated infections. Hence, the government and other concerned bodies should take urgent action to improve WASH services. HIGHLIGHTS 4.6 and 70.4% of the healthcare facilities used advanced and basic water services, respectively.; The healthcare facilities’ access to advanced and basic sanitation services was nil.; The majority of the healthcare facilities had no hygiene and waste disposal services.; 18.2% of the healthcare facilities lacked environmental cleaning services.; Bacteria and chemical contaminants contaminated many water samples.

    Access to water, sanitation and hygiene (WASH) services and drinking water contamination risk levels in households of Bishoftu Town, Ethiopia: A cross‐sectional study

    No full text
    Abstract Background and Aims Access to safe drinking water, sanitation, and hygiene is a fundamental human right and essential to control infectious diseases. However, many countries, including Ethiopia, do not have adequate data to report on basic water, sanitation, and hygiene (WASH) services. Although contaminated drinking water spreads diseases like cholera, diarrhea, typhoid, and dysentery, studies on drinking water contamination risk levels in households are limited in Ethiopia. Therefore, closing this gap needs investigation. Methods A community‐based cross‐sectional study was conducted. A total of 5350 households were included. A systematic, simple random sampling technique was used to select the participants. The information was gathered through in‐person interviews using a standardized questionnaire. Furthermore, 1070 drinking water samples were collected from household water storage. Results This investigation revealed that 9.8%, 83.9%, and 4.9% of households used limited, basic, and safely managed drinking water services, respectively. Besides, 10.2%, 15.7% and 59.3% of households used safely managed, basic and limited sanitation services, respectively. Yet, 10.6% and 4.2% of households used unimproved sanitation facilities and open defecation practices. Also, 40.5% and 19.4% of households used limited and basic hygiene services. On the other hand, 40.1% of households lacked functional handwashing facilities. In this study, 12.1%, 26.3%, and 42% of households’ drinking water samples were positive for Escherichia coli, fecal coliforms, and total coliforms, respectively. Also, 5.1% and 4.5% of households’ drinking water samples had very high and high contamination risk levels for E. coli, respectively. We found that 2.5% and 11.5% of households and water distributors had unacceptable fluoride concentrations, respectively. Conclusion The majority of households in Bishoftu town lack access to safely managed sanitation, drinking water, and basic hygiene services. Many households’ water samples had very high and high health risk levels. Hence, the government and partner organizations should implement water and sanitation safety plans
    corecore