Domestic Purposes Research Articles

Determination of Water Quality for Ground Water Near Municipal Dumpsite in Ibadan Southwest Nigeria

Access to clean drinking water is crucial for human health and survival. In vicinities near municipal dumpsites, ensuring groundwater quality is especially vital to safeguard the ecosystem and human health. This study utilized the Entropy Weighted Water Quality Index (EWQI), a novel assessment tool, to evaluate groundwater near the Awotan dumpsite in southwestern Nigeria. Forty-five groundwater samples were collected during rainy and dry seasons and explored for groundwater quality using EWQI. The physicochemical parameters fall within permissible limits for domestic purposes during both seasons. Nonetheless, 2% of the samples surpassed the recommended nitrate limit of 45 mg/L, and all samples had iron levels above the 0.3 mg/L threshold. The calculated EWQI values for these samples ranged from 20 to 528, with 2% deemed excellent, 16% good, 51% medium, 18% poor and 13% extremely poor in terms of water quality for domestic use. The spatial variability in water quality levels means that there are localised impacts of the dumpsite and thus there is need for targeted management strategies. We recommend the government undertake sustainable retrofitting to enhance landfill design, incorporating an efficient leachate collection system to lessen groundwater pollution. Additionally, nearby residents should implement water treatment methods to improve water quality and minimize health risks.

A modified invasive weed optimization for MPPT of PV based water pumping system driven by induction motor

A novel approach called Modified Invasive Weed Optimization (MIWO) technique has been developed and combined with the Perturb and Observes (P&O) algorithm to enhance the extraction of maximum power from photovoltaic (PV) panels in the presence of partial shading conditions. The conventional P&O algorithm falls short in extracting the maximum power from PV systems under partial shading conditions due to the existence of multiple maximum points. In such scenarios, optimization techniques can be employed to search for the global maximum point. The proposed MIWO-based P&O algorithm updates the reference voltage to ensure that the PV system operates at the Maximum Power Point (MPP) based on the prevailing weather conditions. This MIWO based PV system is further fed to water pumping system. A PV-based water pumping system is utilized for both irrigation and domestic purposes. Additionally, a sensorless vector control-based induction motor is employed in this study to drive the pump. The objective of this research is to demonstrate the achievement of an efficient PV-based water pumping system without the need for battery storage. Various results based on MIWO are compared with PSO and GWO. The results are presented based on various water pumping applications and the availability of solar irradiance during rapid climate changes. MATLAB/Simulink simulations, along with hardware-based experiments, are provided to validate the effectiveness of the proposed method under both transient and steady-state conditions.

Experimental study of parabolic trough collector in series having a concentric copper tube in evacuated tube for air heating

ABSTRACT Currently, the utilization of solar energy for domestic purposes, particularly in applications such as space heating and hot water, is constrained to flat plate collectors and evacuated tubes due to its compact size, absence of tracking mechanisms, low maintenance, and cost-effectiveness. The objective of this study is to evaluate the practical effectiveness of a locally developed parabolic trough collector system through experimentation. In this configuration, two parabolic trough collectors with one-ended evacuated tubes and inner concentric copper tubes for double pass airflow were connected in series, exhibiting an average air temperature within the range of 130.22°C to 166.72°C, which indicates its potential for use in industrial and domestic applications. Solar intensity, thermal performance, and pressure drop were determined after the first evacuated tube (intermediate point) and after the second evacuated tube. The experiments were carried out on six separate days, with three distinct airflow rates of 0.0056 kg/s, 0.0038 kg/s, and 0.0021 kg/s. Results discovered that the maximum air temperature reached was 210.5°C. The maximum thermal efficiency observed was 39.31%, with an overall average thermal efficiency of 30.56%. Further, the maximum pressure drop achieved was 510 Pa at 0.0056 kg/s.

Planning natural gas supply chain pathways for energy system decarbonisation: An Australian case study

The future role of natural gas systems in a deeply decarbonised world is very uncertain. This work seeks to characterise the changes that the clean energy transition is likely to induce in the natural gas chain, across extraction and transmission, distribution networks and gas consumption/use trends, for various scenarios with different demand and supply drivers. First, the results of a least-cost macro-scale energy system planning optimisation are explored to identify future natural gas demand and supply requirements. Second, those findings are used as inputs to a detailed analysis of the full gas supply chain, from extraction to final use, to examine the evolution of i) stored resource levels; ii) transmission and distribution networks operation and financing; and iii) required capacity and siting of gas generation; all, with a realistic account of the related infrastructure. Australia is investigated as a case study that relies on natural gas for both domestic and export purposes. Results project a shift towards a more localised gas consumption to be largely supplied by fewer basins, with associated potential transmission and extraction bottlenecks. They anticipate an overall less utilised, ageing distribution network with potential challenges to asset reliability and financing. Finally, they demonstrate both the scheduled and early retirement of fossil generation assets can allow the siting of considerable amounts of new gas power firming capacity on brownfield sites, thus offering an opportunity to reduce total system costs.

Assessment of spatio-temporal characteristics of groundwater quality at Khordha District, India

Groundwater is the major basis for drinking in various parts of our country. However, it gets contaminated by the toxic materials found in rocks, because of which it becomes unfit for various domestic and irrigation purposes. In present study, the groundwater quality and its availability for various purposes were examined by the parameters such as pH, DO, EC, TDS, temperature, salinity, Alkalinity, Total hardness, calcium hardness, magnesium hardness, chloride, fluoride, nitrate and phosphate during the post monsoonseason of 2022 and pre monsoon season of 2023 from 49 sampling locations. The above mentioned parameters were used for assessing appropriateness of groundwater for irrigation and domestic purposes by comparing them with the Bureau of Indian standards (BIS). The results revealed that groundwater shows wide variations among various parameters between two seasons during 2022–23. Obtained results show that water used for potable purposes by people in various parts of study area doesn’t meet necessary standards.In some of the sampling locations, it is found that the water exhibits very poor quality or unfit maybe for one season or both seasons. Analysis of parameters is done for calculating correlation coefficient of specified parameters. Strong linear relationships, both positive and negative, were found between several pairs of water quality measures according to their research.

Assessing the physicochemical properties of surface/groundwater of Sudhnoti district, Azad Jammu and Kashmir: Impacts on lindane degradation by photocatalysis

Since polluted water deteriorates the health of human beings and other animals, healthy society and environmental sustainability demand for clean and safe water. The presence of contaminants, and imbalance of common physicochemical parameters significantly disturb the quality of water. Taking the importance of clean and safe water into account, this study investigated fourteen physicochemical parameters of hand pump and open well water (main drinking water sources) from fifteen places of district Sudhnoti, Azad Jammu and Kashmir (AJK). The mean values of pH, electrical conductivity (EC), alkalinity, hardness and total dissolved solids (TDS) were 7.6, 349.9 μS/cm, 144, 152 and 190 mg/L, respectively. The mean concentration of Na+, K+, Ca2+, Mg2+, HCO3−, Cl−, SO42− and NO3− was found to be 9.5, 0.96, 9.9, 44.2, 144, 16.8, 8.1 and 6.67 mg/L, respectively. The turbidity as well as the concentration of CO32− was found below the detectable level in all water samples tested. Interestingly, all the studied physicochemical parameters had lower values than the maximum permissible level recommended by the world health organization (WHO) for drinking water. Eventually, the impacts of the studied physicochemical parameters, particularly anions and cation, on the efficiency of water treatment technology for real field application were discussed. The results revealed that physicochemical parameters of the groundwater of Sudhnoti, AJK had a slight effect on the degradation efficiency of one of the most widely used pesticides, lindane, in water by using ultraviolet–visible titanium oxide/hydrogen peroxide (UV–Vis)/TiO2/H2O2) and ultraviolet–visible/titanium oxide persulfate photocatalysis. Of note, the quality of hand pump and open well water which are the main drinking water sources of district Sudhnoti, AJK was found to be fit for drinking and other domestic purposes as well as for the ecosystem.

Spatial distribution of physicochemical parameters and drinking and irrigation water quality indices in the Jhelum River, Pakistan.

Sustainable management of river systems is a serious concern, requiring vigilant monitoring of water contamination levels that could potentially threaten the ecological community. This study focused on the evaluation of water quality in the Jhelum River (JR), Azad Jammu and Kashmir, and northern Punjab, Pakistan. To achieve this, 60 water samples were collected from various points within the JR Basin (JRB) and subjected to a comprehensive analysis of their physicochemical parameters. The study findings indicated that the concentrations of physicochemical parameters in the JRB water remained within safety thresholds for both drinking and irrigation water, as established by the World Health Organization and Pakistan Environmental Protection Agency. These physicochemical parameters refer to various chemical and physical characteristics of the water that can have implications for both human health (drinking water) and agricultural practices (irrigation water). The spatial variations throughout the river course distinguished between the upstream, midstream, and downstream sections. Specifically, the downstream section exhibited significantly higher values for physicochemical parameters and a broader range, highlighting a substantial decline in its quality. Significant disparities in mean values and ranges were evident, particularly in the case of nitrates and total dissolved solids, when the downstream section was compared with its upstream and midstream counterparts. These variations indicated a deteriorating downstream water quality profile, which is likely attributable to a combination of geological and anthropogenic influences. Despite the observed deterioration in the downstream water quality, this study underscores that the JRB within the upper Indus Basin remains safe and suitable for domestic and agricultural purposes. The JRB was evaluated for various irrigation water quality indices. The principal component analysis conducted in this study revealed distinct covariance patterns among water quality variables, with the first five components explaining approximately 79% of the total variance. Recommending the continued utilization of the JRB for irrigation, we advocate for the preservation and enhancement of water quality in the downstream regions.

맞춤형 학습지원을 위한 AI⋅에듀테크 기능 분석틀의 개발과 적용

This study develops a framework to analyze the functions of AI⋅Edutech within the context of personalized learning support and validates its appropriateness by applying it to actual products. A framework was developed through a literature review, refined through a computer education expert review, and contextualized by focusing on group interviews with educational technology experts and curriculum specialists. The “Framework for Personalized Learning Support Analysis” consisted of two major domains and three subdomains. Then, its appropriateness was verified by applying the framework to nine AI⋅Edutech products for domestic and international educational purposes. Insights derived from the development and application process of the framework are as follows: first, confirmation that the framework functions as a procedure for examining AI⋅Edutech features for personalized learning support; second, the ability to conduct a current status survey of AI⋅Edutech products developed to date through the framework; and third, recognition of its role in the development of additional features required to support personalized learning in school settings in the future. With the increasing interest in personalized learning and advancement of technology, AI⋅Edutech, which is experiencing rapid growth, will hopefully be balanced and practically used through an examination using this analysis framework.

GROUNDWATER QUALITY ASSESSMENT FOR RESIDENTIAL AND IRRIGATION PURPOSES: A CASE STUDY OF FUTUK AND ITS ENVIRONS, NORTHERN BENUE TROUGH, NORTHEAST NIGERIA

This research assesses the suitability of groundwater quality in the region for residential and agricultural use. To evaluate the water quality for domestic purposes, 15 samples of groundwater were taken and tested for various physicochemical parameters including pH, electrical conductivity (EC), total dissolved solids (TDS), calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), sulfate (SO4), chloride (Cl), bicarbonate (HCO3), carbonate (CO3), and nitrate (NO3). The quality of irrigation water was evaluated using several parameters: permeability index (PI), sodium absorption ratio (SAR), total hardness (TH), residual sodium carbonate (RSC), and water quality index (WQI). Piper diagrams, Gibbs diagrams, and the chloro-alkaline index were used to determine groundwater facie classification and ion exchange mechanisms. When compared to the WHO 2011 standard, the physiochemical parameters are within the appropriate limits, with the exception of EC and NO3, which revealed excessive values in some samples. All of the measured parameters are suitable for irrigation activities. According to the Kelly index, there is just one sample that is inappropriate for irrigation. The predominant groundwater type in the area is calcium chloride, with sodium chloride constituting the second most common groundwater facies. The hydrochemical mechanism that regulates the local groundwater chemistry is reverse ion exchange. This indicates a positive index, resulting from the exchange of sodium (Na) and potassium (K) in the groundwater with calcium (Ca) and magnesium (Mg) in the aquifer components.

Assessment of spatio-temporal variations in groundwater quality for the groundwater-dependent Maltese islands

Study regionMaltese islands Study focusThe Maltese islands are situated in the Mediterranean Sea, characterized by a semi-arid climate, and encounter increased levels of water stress. This study conducted a hydrochemical analysis of 35 groundwater samples to evaluate the suitability of the current groundwater for agricultural and domestic purposes. Additionally, three-dimensional numerical modeling was conducted to estimate long-term changes in groundwater levels and saline water distributions over 30 years, under the assumption that groundwater pumping will persist at the current rate. New hydrological insights for the regionSalinity factors that classify groundwater in this region can potentially be used for the irrigation of salt-tolerant crops. The output of the modeling calculations suggests that groundwater levels were expected to decrease significantly across most of the island, particularly around gallery areas. Descending the water table may compromise the discharge of coastal groundwater and potentially accelerate seawater intrusion into the inner island areas. Hydrochemical calculations indicated that an increase in salinity induced variations in saturation conditions, leading to a decrease in calcite and an increase in anhydrite, dolomite, and gypsum. The water quality characteristics and contamination evaluations conducted in this study are valuable for the development of long-term alternatives for water resource conservation in this region.

Identification of microbial groups in the aeration tanks of secondary wastewater treatment stage

Microbes are prevalent in wastewater, degrading organic matter that impact the environment. In recent years, wastewater treatment plants have been used to process treated water for domestic purposes, sustaining groundwater resources for the future. The current study assessed the present microbial species in the aeration tanks for the secondary wastewater treatment stage in the Sulaibiya Wastewater Treatment and Reclamation Plant, Kuwait. Biweekly wastewater samples were collected for a period of three months from October 2022 to December 2022 from the aeration tanks. The collected wastewater samples were analyzed for microbiological parameters including total coliform, fecal coliform, Salmonella, and E. coli. Further, the microbial species were identified using the Biolog Omnilog Instrument. The results indicated that a total of 45 bacterial species isolates were identified with the most dominant genus being Bacillus with twenty-one isolates. Though Bacillus is common in aeration tanks, the presence of Bacillus thuringiens/cereus is rare and their existence could be due to the change in climatic conditions such as rainfall, dust and wind. Therefore, the study recommends that all microbial groups should be identified at all treatment stages including, primary, secondary, tertiary, and advanced treatment stages to ensure the complete removal of microbes.

Assessment of the presence of Vibrio cholera and detection of toxigenic Vibrio cholerae in river sources within the Vhembe District Municipality Limpopo province of South Africa

ABSTRACT Most rivers in South Africa, particularly in rural areas, are contaminated and serve as a breeding ground for potential disease-causing microorganisms such as Vibrio cholera. Contaminated river sources could endanger the health of those communities that rely on them for domestic, agricultural, and recreational purposes. The aim of the study was to examine the presence of V. cholera and toxigenic V. cholera water samples from river sources collected in the Vhembe Municipal District during a three-month period. Physicochemical parameters, culture dependent and molecular techniques were used to identify V. cholerae in the samples. Majority of the physiochemical parameters were within the acceptable limit with exception of electrical conductivity readings in the Mvudi, Livuvhu, Dzindi, Nzhelele, Mutale, Shingwedzi, Tshinane and Nwedi rivers which were above the acceptable standard limit of 0–70 μS/cm. Most of the river samples tested positive for the presence of V. cholera, particularly on the downstream samples. Toxigenic V. cholerae was detected in four of the 12 samples that originally tested positive for V. cholera. The study revealed poor water quality and significant health concerns to consumers, emphasizing the importance of implementing river basin management measures to ensure the long-term sustainability of these rivers.

Quantification of Nitrate Level in Shallow and Deep Groundwater Wells for Drinking, Domestic and Agricultural Uses in Northeastern Arid Regions of Saudi Arabia

Nitrate (NO3−) is a vulnerable natural contaminant that can be found in groundwater. The estimated nitrate concentrations for four categories of wells in the northeastern arid regions of Saudi Arabia—commercial treated water stations for drinking, commercial stations of untreated water for domestic uses, private wells of residences for households, and private wells for agricultural uses—were found to be in the 16–380 mg/L range. Drinking water from all commercial treated water stations has lower nitrate levels, based on the WHO standard of 50 mg/L. In contrast, almost 33% of commercial stations with untreated water (used only for domestic purposes) in the studied areas had higher nitrate levels that were unsuitable for drinking. Approximately half of the private wells of residences and wells for agricultural uses had very high nitrate levels. They can be considered unsuitable for drinking due to excessive levels of nitrates but can be used for domestic and agricultural purposes. Thus, adopting specific strategies to reduce nitrate levels in public wells in the studied areas is crucial. The data obtained in the present study are essential for equipping decision-makers with valuable insights, allowing them to enact appropriate measures, as needed, and uphold community health in the studied regions.

Assessments of Water Quality and Plankton Diversity in the Baur Reservoir, Uttarakhand, India

The current investigation was conducted between January and December of 2022. During the study period water quality was studied in Baur reservoirs two spot, one spot is a barrage area, and the second one is four kilometers away from the first one. The present study is done in Baur Reservoir, which is switched to Gularbhoj in Udham Singh district. Reservoir water is used for irrigation and domestic purposes. Many villages are located near the reservoir, so due to human interaction, water quality may be affected. For this reason, the present study finds parameters of water so we can identify the present water quality status, as we know many similar work done all over India but in this study we find present condition which may be change from past condition and as we know climatic condition are change now days so we can find rainfall in every month and other parameters of reservoir. Various quality parameters are measured, including PH, water temperature, DO, CO2, total alkalinity, total solid, turbidity, total suspended solids and total dissolved solids. All the parameters are within the permissible limit and suitable for domestic use, pisciculture, and agriculture. Water quality parameters have been observed to vary and, with the exception of temperature, all show a positive correlation with the production of phytoplankton and zooplankton in the chosen reservoirs. These parameters include temperature, pH, dissolved oxygen, carbon dioxide, and total dissolved solids. The temperature varies from 240c+ 60c, the pH varies from 7.0 + 2, the dissolved oxygen range varies from 7+ 3, range of carbon dioxide varies from 6+ 5, the humidity range is 50+25, and rainfall throughout varying the all study period. All the physico-chemical parameters are the relation to plankton diversity. In this study, we also find plankton diversity status in Baur reservoir. Plankton diversity can also help to find out the water quality; healthy plankton growth may relate to water quality as well as fish diversity. In the following study, we find the groups Copepoda, Clyadocera, and Rotifera, each containing 6, 6 and 2 respectively. The groups Bacillariophyceae and Chlorophycae each contain 29 and 23, respectively, phytoplankton taxa. The study looked at the association between group variation in physico-chemical parameters for the Cyanophyceae, Dinophyceae, and Euglenophyceae. With the help of this study, we can find the pollutant status and water quality level in the Baur reservoir. All the water quality parameters are under safety level and are good for irrigation purposes and for domestic use. They can filtrate, and may relevant department may take action for tourist activity that causes pollution in reservoir water.

A Comparative Study to Analyze the Validity of Well Water for Some Areas of Eastern and Western Diyala Governorate

General Background: Groundwater is a critical resource for many regions, particularly in arid and semi-arid areas, where surface water is scarce. Specific Background: In Diyala Governorate, Iraq, reliance on groundwater is high, especially in the northeastern and western regions, which use it extensively for domestic and agricultural purposes. Knowledge Gap: Despite its importance, there is limited comprehensive analysis comparing the quality and suitability of groundwater across different areas within the governorate. Aims: This study aims to analyze the chemical and physical properties of groundwater from selected wells in the northeastern (Khanaqin and Saadia) and western (Khalis and Dali Abbas) regions of Diyala Governorate to determine its suitability for use. Results: The analysis revealed a significant increase in nitrate concentrations, particularly in the western regions, with a value of 26.3 mg/L, and higher nitrite levels were also observed. The pH levels indicated a tendency toward acidity in the northeastern regions (7.1-7.2), whereas the western regions showed values closer to the acidity standard (7.05-7.45). The dissolved salts were notably lower in Khalis (575 mg/L). Novelty: The study uniquely highlights the variation in groundwater quality across different regions of the governorate, revealing critical discrepancies in water composition and well depth that have not been previously documented. Implications: These findings underscore the need for region-specific water management strategies in Diyala Governorate, particularly in the eastern regions where groundwater characteristics align more closely with international standards, making them more suitable for sustainable groundwater investment and utilization. Highlights: Significant regional differences in groundwater quality were observed. Higher nitrate/nitrite concentrations found in western regions. Eastern regions' groundwater closer to international standards. Keywords: Groundwater quality, Diyala Governorate, nitrate concentration, pH levels, water suitability

Antibiotics Resistance Pattern and Molecular Detection of ESBL Genes in E. coli from both Surface and Underground Water used for Domestic Purposes in Selected Locations in Ibadan, Oyo State, Nigeria

Antibiotics Resistance Pattern and Molecular Detection of ESBL Genes in E. coli from both Surface and Underground Water used for Domestic Purposes in Selected Locations in Ibadan, Oyo State, Nigeria

Evaluation Of Some Drinking Water Qualities In Some Villages In Gezira State

Safe and potable water is the basic need for human. In Gezira State groundwater is the main source of domestic water. While most villages in Gezira State traditionally use pit latrines, septic tanks and injection wells have been introduced recently. The aim of this study is to investigate the effect of latrine system in some villages in North Gezira State on some physical, chemical, and microbiological parameters of groundwater. Water samples were collected from sixteen villages (Wadalmahna, Alkamlin Abdalab, Umdagarsey, Wadalmajedi, Abu usher, Altalbab, Alshawarab, Genib, Albataheen, Abufroa, Alsadaga, Alhassaheisa, Alsalama, Addaid Abu usher, Altakla Hamed, and Altakla Gobara) and analyzed for various physico-chemical and microbiological parameters. Physico-chemical parameter includes pH, electrical conductivity, turbidity, total dissolved solids, total hardness, calcium, magnesium, sodium, chloride, and some heavy metals. The microbiologic test includes a total count of coli form and fecal coli form E. coli, which is an indicator of fecal contamination of water. Standard laboratory methods for analysis were used. These parameters were compared with World Health Organization (WHO) and Sudanese Standards and Metrology Organization (SSMO) to assess the suitability of groundwater for domestic purpose. The results show that most of the Physio-chemical parameters are within the acceptable ranges for WHO and SSMO, except water salinity in three villages (Alshawarab, 1935 μmhoscm-1; Albataheen, 1885 μmhoscm-1 and Abufroa, 1780 μmhoscm-1) is higher than the acceptable level (1500 μmhoscm-1). For microbiological tests, total coli form bacteria were detected in all water samples. E. coli was not detected in villages where traditional pit latrine is used. In village where septic tank and injection well is common E. coli was detected in all the samples. The study concludes that the groundwater used for drinking in North Gezira State is polluted, and there is contamination with E. coli in areas where traditional pit latrines are not the sanitation system. Keywords: drinking water, latrine system, Villages in Gezira State, Physical, chemical, groundwater, WHO, microbiological

Seawater Intrusion and Nitrate Pollution in the Quaternary Coastal Aquifers of Jefara Plain, Northwestern Part of Libya

Jefara Plain Quaternary Coastal Aquifer is the most important resource of water supply in the urban coastal, in the northwest part of Libya, used for domestic, agricultural, and industrial purposes. However, groundwater overdraft and contamination are the main problems affecting the aquifer system. This study was conducted to evaluate the principal hydrogeochemical processes controlling groundwater quality in the urban coastal strip. Besides, investigation of the threats of seawater intrusion and pollution was carried out. In addition, 59 groundwater samples were collected from different wells and analyzed for various parameters. Major cations and anions analyzed in the groundwater samples reveal that groundwater is mainly affected by several factors such as dissolution of calcite and dolomite, seawater intrusion due to aquifer overexploitation, and nitrate pollution mainly caused by the intense agricultural activities and leakage of nitrate from septic pits.

Decision Support Systems Based on a Multiple-Criteria Decision Analysis to Promote a Whole-of-Resource Approach for Water Management, with a Case Study of Rural Bengaluru in India

The sustainable availability and resilient supply of safe drinking water remains a challenge that is far from fulfilled. As of 2024, around 2 billion people worldwide do not have access to safe drinking water. The regions of Sub-Saharan Africa and South Asia are the most vulnerable regions in this regard. This is despite the fact that these regions are home to some of the world’s fastest-growing economies. However, economic growth and rapid urbanization may also be connected to the increasing water stress in the suburban and rural areas. We propose addressing the two main challenges in this regard, which are the selection of the suitable treatment and distribution systems for different contexts using a decision support system following a Whole-of-Resource Approach (WORA). This approach considers the different water sources and sinks as contributing to a positive or negative change in the single resource, irrespective of whether the resource, in this case water, is used for domestic, industrial, or agricultural purposes. In this regard, this paper presents an illustrative proof of concept for such a decision support tool based on a multiple-criteria decision analysis. The decision support tool is aimed at facilitating water management within a WORA by providing recommendations regarding rainwater harvesting and savings in agricultural water consumption, in addition to suggesting water treatment and distribution systems, enabling systemic water resource management adapted to local context-specific conditions and needs.

Temporal and spatial variation in water quality in the Son La hydropower Reservoir, Northwestern Vietnam

The Son La hydropower reservoir (S.L.R.) is the largest water reservoir in Vietnam. Da River water has been treated for drinking and domestic purposes; water quality management is essential for the safety of ecosystems and human health. This study was conducted to determine changes in water quality indicators [pH, dissolved Oxygen (D.O.), total suspended solids (T.S.S.), chemical oxygen demand (C.O.D.), ammonium (NH4+), nitrite (NO2-), and coliform] in the Da River in 2010 and the Son La hydropower reservoir during 2014-2023. The results of mean annual values of Da river water quality and Son La hydropower reservoir were, specifically: pH (7.8; 7.4), D.O. (4.3; 6.2), T.S.S. (112; 5), C.O.D. (15; 8.7), NH4+ (0.17; 0.3), NO2- (0.009; 0.04), and coliform (1,723; 747). Water quality parameters significantly varied between rive and reservoir water: D.O., T.S.S., C.O.D., and Coliform. pH, T.S.S., and C.O.D. slightly decreased; however, Dissolved oxygen (D.O.), NH4+, NO2-, and coliform demonstrated an increasing trend during 2014-2023. The impact of the Son La Dam (S.L.D.) on water quality was relatively straightforward: increasing the concentration of dissolved oxygen and the self-cleaning ability of pollutants. Periodic water impoundment was divided (April to August) into a low water level of 175 m, impoundment (January to March), a median water level of 190m, and a high water level of 215 m (September to December) to period. However, the impact of the staged impoundment on water quality, especially in 2014-2023, remains unclear, except D.O., T.S.S., NH4+, NO2- and Coliform exceeded limits or were lower is not significant for living water under the Vietnam regulation, specifically: D.O. (5.36, 5.52; ≥ 6), T.S.S. (25.13; ≤ 25), NH4+ (0.3331; 0.3), NO2- (0.0504; 0.05), coliform (1,018.5; ≤ 1,000). Results from the current study provide valuable information for reservoir and river water pollution source management and reduce potential risks to exposed ecosystems, livelihoods, and human health.