scholarly journals Sensitivity analysis for water quality monitoring frequency in the application of a water quality index for the uMngeni River and its tributaries, KwaZulu-Natal, South Africa

Water SA ◽  
2018 ◽  
Vol 44 (4 October) ◽  
Author(s):  
JN Namugize ◽  
GPW Jewitt
Keyword(s):  
Escherichia Coli ◽  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Monitoring ◽  
Quality Monitoring ◽  
Quality Data ◽  
Quality Indices ◽  
Water Quality Indices ◽  
Monitoring Frequency

Water quality indices are commonly used to provide summary information from water quality monitoring programmes to stakeholders. However, declining funding and changing mandates often result in reduced monitoring frequencies which could affect the accuracy of information provided. Thus, this study aimed to assess the effect of water sampling frequency on water quality index reporting using the the upper uMngeni catchment as a study site. A 28-year time series of water quality data from 11 sampling stations was assessed for pH, electrical conductivity, temperature, turbidity, total suspended solids, Escherichia coli counts, NH4-N, NO3-N, PO4-P and total phosphorus. Statistical packages were used to process the data and water quality indices (WQIs) for eutrophication and recreational water were calculated and their sensitivity to input parameters analysed. It was found that the higher the monitoring frequency, the lower the WQI calculated at all sites. This suggests that water quality, due to a declining monitoring frequency, is poorer than reported in the uMngeni catchment. The findings showed that Escherichia coli and turbidity are the most influential variables affecting the recreational and eutrophication WQIs, respectively. Although WQIs are considered a useful tool for monitoring the changes in water quality across space and over time in the uMngeni Catchment, their use should complement, and not substitute for, other, more comprehensive, water quality management tools.

scholarly journals Determination of Some Physico-Chemical Parameters and Water Quality Index (WQI) of Laguna de Bay, Philippines

2020 ◽  
pp. 1-6
Author(s):  
Jessa Marie S. Caabay S. Caabay
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Monitoring ◽  
The Philippines ◽  
Quality Monitoring ◽  
Critical Element ◽  
Index Method ◽  
Physico Chemical ◽  
Laguna De Bay

Water quality monitoring activities is a vital part in assessing the status of certain bodies of water such as the Laguna de Bay. The lake has been a significant natural resource as a catchment of an expansive watershed providing various ecological and economic values. It is the largest inland water body in the Philippines and the third largest in South East Asia. Water quality monitoring network is a critical element in the assessment, restoration and protection of Laguna de Bay. This paper measured some important physico-chemical properties of four selected sites from Laguna de Bay such as temperature, pH, electrical conductivity, alkalinity, dissolved oxygen levels, and phosphate and ammonia concentrations. Water Quality Index (WQI) utilizing Weighted Arithmetic Water Quality Index Method was also evaluated.

scholarly journals Evaluation of water quality and eutrophication status of Hawassa Lake based on different water quality indices

2021 ◽  
Vol 11 (3) ◽  
Author(s):  
Zemed Menberu ◽  
Beshah Mogesse ◽  
Daniel Reddythota
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Secchi Depth ◽  
Mitigation Measures ◽  
Ethiopian Rift ◽  
Quality Indices ◽  
Water Quality Indices ◽  
Canadian Council

AbstractLake Hawassa is one of the major Ethiopian Rift Valley Lakes having an endorheic basin system. The surrounding community makes use of the lake water for the multiple purposes of irrigation, domestic water supply, recreation and fish harvesting. The aim of the present study was to ascertain the water quality of the lake in terms of water quality indices (WQI) and its health over a period of three months covering both dry and wet seasons. Overall, the water quality of Lake was unfit and bad as per the weighted arithmetic method (120.06–228.29) and modified Bascarón water quality index (MBWQI) methods (26.81–33.89), respectively. However, the quality was indicated as marginal, as per the Canadian Council of Ministers of the Environment (CCME) water quality index method (44.2–51.1). On average, the lake was under the hypertrophic stage as per the standard based on the results of Secchi depth and nutrient concentration. The current study showed the lake being unfit for all-purposes as per WAWQI range (> 100). According to the physicochemical and biological parameters, of the lake, it requires mitigation measures to control Eutrophication and pollutants inflow.

scholarly journals Monitoring Lotic Ecosystem by the Application of Water Quality Index (CCMEWQI)

2020 ◽  
Vol 17 (1) ◽  
pp. 0023
Author(s):  
Salman Et al.
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Management ◽  
Water Quality Monitoring ◽  
Quality Data ◽  
Total Hardness ◽  
Water Quality Data ◽  
Quality Of Water ◽  
Lotic Ecosystem

Water Quality Index (WQI) as a tool to assess the water quality status provides advice related to the use of water quality monitoring data and it is a way for combining the complex water quality data into a single value or single statement.The present study was conducted on Al- Hilla river in the middle of Iraq from August 2012 to July 2013 at five selected stations in the river, from Al- Musaib city to Al- Hashimya at the south of Hilla to determine its suitability for aquatic environment (GWQI), drinking water (PWSI) and irrigation (IWQI).This index offers a useful representation of the overall quality of water for public or any intended use as well as indicating pollution, water quality management, and decision making. According to the obtained results, it can be concluded that the EC, TSS, Total hardness, Ca, Mg, DO, BOD5, and NO3 moved away from the desired standards when the temperature rises. The variable of value of this index may be due to increasing the ration of organic matters and converting the carbonate to bicarbonate. The results recorded high value of calcium and magnesium more than the standard value of WHO and IQS (50 mg/l and high value of total hardness more than 500 mg/l). Irrigation water quality index (IWQI) in the study sites were ranged between 66-83 ranged between fair and good.                                                  

scholarly journals Investigation of water quality in wet and dry seasons under climate change

2020 ◽  
Vol 10 (5) ◽  
pp. 94-104
Author(s):  
J. Safieh ◽  
D. Rebwar ◽  
M.H. Hamed
Keyword(s):  
Water Quality ◽  
Water Resources ◽  
Water Quality Index ◽  
Quality Index ◽  
Pollution Abatement ◽  
Quality Indices ◽  
Water Quality Indices ◽  
New Findings ◽  
Using Data

Background: Providing fresh water suitable for drinking and farming and living organisms in the ecosystem is essential. To evaluate water quality, qualitative indicators are often employed for managing water resources and water quality protection and pollution abatement. Aim: This study evaluated the quality of Borkhar basin water resources using three different water quality indices, including National Institutes of Health Water Quality Index (NIHWQI) having nine parameters, the Oregon Water Quality Index (OWQI) having eight parameters, and the Canadian Water Quality Indices (CWQI) with 22 main parameters. Material and methods: Using data for a period of 30 years, NIHWQI, OWQI and CWQI were used. To analyze water quality of the entire basin for current and future time. New findings: Results showed that water quality of the basin was in a very moderate range according to NSFWQI, and was in a very bad range accordingly to OWQI. Water quality forecasts showed that future water quality would be bad, based on OWQI and moderate based on NSFWQI, whereas based on CWQI, it will be good for drinking, and bad for aquatic animals, recreation, irrigation, and livestock use.

scholarly journals Water Quality Monitoring of Yamuna River by Using GIS Based Water Quality Index in Delhi, India

2017 ◽  
Vol 6 (2) ◽  
pp. 1249-1263 ◽  
Author(s):  
Shikha Sharma ◽  
Pawan Kumar Jha ◽  
Manju Rawat Ranjan ◽  
Umesh Kumar Singh ◽  
Tanu Jindal
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Water Quality Monitoring ◽  
Quality Monitoring ◽  
Yamuna River

scholarly journals Comparative Analysis of Water Quality Indices and Their Relationship with Anthropogenic Activities. Case Study: Bogotá River

2021 ◽  
Author(s):  
Wilfredo Marimon ◽  
Nathalie Toussaint Jimenez ◽  
Carlos Jiménez ◽  
John Chavarro ◽  
Efraín Domínguez
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Anthropogenic Activities ◽  
Microbiological Quality ◽  
Monitoring Network ◽  
Water Quality Monitoring ◽  
Quality Indices ◽  
Advantages And Disadvantages ◽  
Microbiological Parameters

Abstract The Water Quality Index is the numerical value that qualifies in categories, the water quality of a surface stream, based on the measurements obtained for a set of physicochemical and microbiological parameters registered in a water quality monitoring network. This indicator allows knowing the physical-chemical and microbiological quality conditions of a body of water and identifies contamination problems at a certain point. In the present study, the water quality was studied in 43 stations located in the Bogota river, considering different methodologies for calculating quality indices such as NSF, Oregon, IDEAM, Prati, and diffuse logic to establish the differences, advantages, and disadvantages of each method. Similarly, a correlation analysis was carried out between the parameters, and the land uses in the basin. The results indicated that all the indices showed regular or poor water quality for more than 80% of the stations for the temporal window studied. However, the methodology used in Colombia (ICA water quality index, in Spanish) has eclipsing problems in most of the evaluation points since where the water quality qualifies as good, other indices such as the fuzzy logic show a degree of contamination by any of the parameters mainly manganese or total suspended solids.

scholarly journals Selection of variables in the definition of a water quality index for the Brazilian Federal District

2019 ◽  
Vol 14 (4) ◽  
pp. 1
Author(s):  
Ana Luiza Litz Passos ◽  
Daphne Heloisa de Freitas Muniz ◽  
Leandro Pin Rangel ◽  
Eduardo Cyrino Oliveira-Filho
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Treatment Plant ◽  
Federal District ◽  
Quality Indices ◽  
Water Quality Indices ◽  
Regional Characteristics ◽  
Selection Of Variables ◽  
Definition Of

Water Quality Indices (WQIs) are based on a small number of variables that establish categories for water quality. This method presents some problems with the evaluations, since WQIs do not consider the multiple uses of the water or differences in regional characteristics. The present study proposes a regional and more appropriate variable group for the definition of a Water Quality Index for the Brazilian Federal District, based on water quality monitoring of surface waters in the region. The monitoring was carried out monthly between August 2016 and July 2017, at three points on the Jardim River, Sobradinho Stream and Sarandi Stream, where 21 variables were evaluated. Among physical-chemical and microbiological analyses, the regional characteristics of these water bodies were noted, as well as their differences, and the main anthropogenic interferences that generate changes in water quality. In the urban area, the disposal of treated sewage from the wastewater treatment plant of Sobradinho was highlighted as the main anthropic interference, and agricultural activities stood out in the rural region of the study area. The impacts in the urbanized area were of greater weight. Thus, based on the results of the Principal Component Analysis (PCA), two groups of variables were selected, one representative of urban areas and the other of rural areas, to compose two probable water quality indices (WQIs) for the Federal District.

scholarly journals Investigation of water quality in wet and dry seasons under climate change

2021 ◽  
Vol 3 (1) ◽  
pp. 111-123
Author(s):  
Safieh Javadinejad ◽  
◽  
Rebwar Dara ◽  
Masoud Hussein Hamed ◽  
Mariwan Akram Hamah Saeed ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Resources ◽  
Water Quality Index ◽  
Quality Index ◽  
Pollution Abatement ◽  
Quality Indices ◽  
Water Quality Indices ◽  
Using Data ◽  
Living Organisms

Providing fresh water suitable for drinking and farming and living organisms in the ecosystem is essential. To evaluate water quality, qualitative indicators are often employed for managing water resources and water quality protection and pollution abatement. This study evaluated the quality of Borkhar basin water resources using three different water quality indices, including National Institutes of Health Water Quality Index (NIHWQI) having nine parameters, the Oregon Water Quality Index (OWQI) having eight parameters, and the Canadian Water Quality Indices (CWQI) with 22 main parameters. Using data for a period of 30 years, NIHWQI, OWQI and CWQI were used. To analyze water quality of the entire basin for current and future time. Results showed that water quality of the basin was in a very moderate range according to NSFWQI, and was in a very bad range accordingly to OWQI. Water quality forecasts showed that future water quality would be bad, based on OWQI and moderate based on NSFWQI, whereas based on CWQI, it will be good for drinking, and bad for aquatic animals, recreation, irrigation, and livestock use.

DEVELOPMENT OF A MULTIPARAMETRIC QUALITY INDEX FOR WATER QUALITY MONITORING

2016 ◽  
Vol 15 (5) ◽  
pp. 1069-1074 ◽  
Author(s):  
Violeta-Monica Radu ◽  
Alexandru Anton Ivanov ◽  
Petra Ionescu ◽  
Gyorgy Deak ◽  
Marian Tudor
Keyword(s):  
Water Quality ◽  
Quality Index ◽  
Water Quality Monitoring ◽  
Quality Monitoring
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