Water Quality - Science topic
Water quality is about the chemical and biological constituents of water. It comprises: 1) Water chemistry data compilations; 2) Development of reliable sampling and analytical protocols; 3) Research about water-rock, water-soil and water-atmosphere interactions; 4) Identification of water-contamination sources; 5) development of remediation strategies for poor-quality water. Water quality often means the difference in constituent concentrations between field samples and standard concentrations set by governmental authorities to protect human and ecosystem health. It is distinct from water quantity, which is broadly equivalent to physical hydrology.
Questions related to Water Quality
Please suggest me latest software to analyse the land use/land cover impact on water quality of river basin.
We performed two water quality tests, 1) pre-filter that showed no Lead and 2) post-filter that showed lead (0.0048ppm). The filter is an under-the-sink reverse osmosis system (https://nuaquasystems.com/products/nu-aqua-platinum-series-7-stage-alkaline-and-uv-ultraviolet-100gpd-ro-system).
Any ideas on how this is possible?
I would be very appreciative if you introduce a valid guideline for water quality parameters for wildlife habitats.
What is clearer is the question of water quality in terms of qualitative characteristics, whether or not they change?
Hello! I am putting together a dataset of benthic macroinvertebrate monitoring / count data from estuaries and coastlines along the North American Coast (Canada and US). I know of larger datasets like the NCCOS National Benthic Inventory and EMAP, but I was wondering if anyone knew of other regional datasets. It would be preferable if the data were collected using Young-modified Van Veen grab samplers along with information on water quality and sediment quality, but any dataset recommendations will be greatly appreciated!
Since WQI models are not generic and there are more than 35 ones, what is the suitable model (WQI) to assess spring water quality?
What is the best (low cost and high efficient) method (Physical, Chemical, or Biological) of wastewater treatment to meet irrigation water quality ranges?
One lake suffered great damage in terms of water use and catch due to the deterioration of water quality. As a measure to improve water quality, the development of sewage treatment plants and the spread of cultivation methods with reduced amounts of chemical fertilizers were promoted, and the water quality was significantly improved. However, as a result of the dramatic improvement in water quality (decrease in nutrient concentration and COD concentration), the fish catch recovered once, but tended to gradually decrease. The fishermen's union has raised the issue of reduced catches due to improved water quality and is calling on local governments that have promoted water quality improvement policies to return to their original water quality.
Devise the best possible solution to this problem. Also, explain the scientific basis for that solution in a comprehensive way.
I am pursuing Ph.D. on anthropogenic impact on fluvial environment. This is my last year my work is almost complete. Can anyone walk me through the process of pursuing PDF in India or preferably abroad? I have one international publication in springer on water quality and two other are in the pipeline on river migration process and anthropogenic impact on rivers.
Policy discussions and scientific studies today omit the important linkages between water quality and climate change, whereas the impacts of climate change on the quality of freshwater systems are likely to be significant. More scientific understanding is hence needed to address the physical, chemical, biological and socio-economic impacts that current and expected climate change have, and will continue to have, on the quality of the world’s freshwater resources. In this context, what do you think are the impact of climate change on water quality?
I was unable to perform the sampling and analysis for 40 surface water and 20 groundwater samples, so I hired an in-country consultant firm to do it. The results that they returned were difficult to interpret and had extremely high levels of iron and manganese. I spoke with a former professor and he expressed concern from his long career of working in SE Asia that the subcontractor/lab might not have filtered the samples. How can I know that the results are for the water and not the particulates?
I am looking for models like Vollenweider Loading Plots and want to calculate and predict eutrophication in some reservoirs. I have some data about their incoming monthly flows, incoming flows quality, their capacity, and so on.
Could you please introduce me to other models?
Thanks a lot.
Does the slope factor (SF) and reference dose values (RFD) for different metals remain constant when assessing the risks of heavy metals in water, soil, or sediments?
If it is different according to the environment, please provide us with the values of each environment.
I have predicted the trend in water quality using past 12 years data. My aim is to predict the impact of climate change on groundwater quality for coming decades. In order to achieve so, which data and software is required I am not so sure about it.
I am searching on standard books on secondary WW treatment options such as oxidation ditch and maturation ponds. I would like to know which books do you recommend for students.
Excess of fluoride content in drinking water (more than 1.5mg/L) sourced from inland water bodies causes dental fluorosis and skeletal fluorosis. Although reverse osmosis (RO), electrodialysis, and distillation are available for deflouridating inland water bodies. However am not sure that how effective these methods can be used to deflouridate groundwater. I would like to hear some suggestions on the mechanisms effective at deflouridation of groundwater.
We are seek alternatives to Qual2kw in water quality simulation models based on R program. Present day, we use .xlsx based model. Our objective is calibrate/simulate water quality scenarios of river, with point/nonpoint sewage sources. Thanks a lot!
Have a nice day everyone,
I need historical N-P datasets to run my conceptual model whose diagram is attached. I'd be so glad if you could suggest any database and/or platform to access to water quality data.
Thanks in advance
Best of luck
Some specialists use the electrical resistivity methods to determine the quality of groundwater. I see that we carry the method more than its ability... what do you see? Taking into account the difference between water salinity and water quality
I took a series of DO concentration readings at freshwater springs distributed over a large geographical area. Four weeks elapsed between the first measurement and the last. Each site was sampled only once. The DO concentration values of all readings are considerably lower than I expected.
All measurements were taken using a multi-parameter water quality meter from Hanna Instruments (HI-98194). Calibration was completed the day before the start of the sampling campaign.
I hope everyone is doing well,
Currently, I'm working on remote sensing of water quality with an emphasis on suspended sediments estimation. recently I'm going to use machine learning algorithms such as Random Forest, Support vector machine, cubist, convolutional neural networks in R to train and predict water quality parameters such as suspended sediments from satellite images.
I appreciate any help with providing R code with some explanations on this.
I am selecting an opensource hydrological model to perform a water sustainability assessment at a basin scale, including blue and green water sustainability evaluation and some considerations about water quality. I need an open source, well documented and user friendly open source software. After a first check, I identified two suitable options: SWAT+ and SWIM. I cannot really understand the differences among them. Any suggestion from someone who has already used these models? Thank you for your cooperation.
need to understand what it depicts
how to read dendrogram
how to make important inferences using this
I would be grateful if you could help me find out one or few case studies in the Pacific region where soil erosion in pineapple fields is efficiently managed. As part of a regional project (www.spc.int/resccue) dedicated to integrated coastal zone management in the Pacific region, I would like to identify few case studies where soil erosion in pineapple fields is correctly managed in order to organize a technical exchange between pineapple producers in French Polynesia and producers in other places of the Pacific region.
Many thanks for your answer.
Do not hesitate to contact me if you need further information.
Mr CHARLES mahe / RESCCUE project coordinator in French Polynesia
I Have been so much overwhelmed by the parameters that needs to be adjusted in the .wwq input file, as i was reading the SWAT 2012 documentation , the most of the parameters are explained but, they need high level of expertise and time to collect all the necessary data to adjust them,
has anyone ever did adjust those parameters , if so share your expirience ,
or can i just run the model with the default parameters, then after calibration i could just use the data to represent the watershed ?
help iam just a novice in this model , i just want to model water quality
please be kind
thanks in advance
Are there publications/guidelines about methodologies for identifying critical areas based on stormwater quality? I am especially interested in methods based on GIS analysis and water quality sampling. By sampling I mean quite practical approaches that municipalities can utilize while trying to map critical areas for stormwater quality management, and with city-scale focus. I assume that a city-scale project has to start with a GIS analysis of critical areas and then, as a second phase, continue with a water quality sampling campaing(s) of selected sites.
I want to get some water quality parameters (ideally dissolved oxygen, turbidity, chlorophyll, pH, etc.) inside oyster bags. The oyster bags are mesh (potentially a range of mesh sizes from 1 mm up to 25 mm or so, but most typically around 9 mm), and I'm trying to find out how water quality varies within these bags with, for example, stocking density. The bags are often 3' x 1.5' x 0.25 '
I'd like to sample these parameters without 1) having to put a datasonde in each bag (unless they are very cheap) or 2) having to open each bag.
In talking with YSI, there are flow cell chambers that enclose the probes and they suggested pumping the water into the chamber via tubing inserted into the bag through the mesh. As described, this would take a full liter of water (where the entire bag volume is around 40 liters, but is, of course, open to the surrounding water).
I'd like to draw the smallest possible amount of water to reduce the likelihood of drawing in water from outside the bag. I'm also open to entirely different solutions. Appreciate any feedback.
Most of the developing countries extract water from the shallow water table for drinking and other activities. Pit latrines/toilet pits and drinking water wells are located in the same land in such countries.
Safe distances between wells and pit latrines are varied from location to location depending on the soil type, hydrogeological condition of the ground, and the elevation of the toilet pit. In practice, this distance varies from 15 m to 30 m in accordance with guidelines provided by the local authorities in developing counties. Viruses are very small compared to other microorganisms so that they can be pass through the porous soils easily.
Behaviors/stability of Coronavirus in the shallow water table are being studied. I would like to discuss this matter with the latest findings.
If you are working in the Great Lakes especially in Areas of Concern (AOCs) we have a project that we are working on. This research project is to study the economic impacts of remediation and restoration at Great Lakes Areas of Concern. The research participant will conduct research collaboratively with ORD staff and the Great Lakes National Program Office (GLNPO) of EPA's Region 5 office. This research will apply a variety of economic approaches (e.g., both market and non-market valuation such as from I-O modeling, hedonic models, and benefit transfers) to quantify the benefits and costs of remediation and restoration projects in Great Lakes Areas of Concern (AOCs). The research participant will collaborate with a multi-disciplinary group of individuals including but not limited to water quality modelers, engineers, economists, ecologists and social scientists evaluating remediation, restoration and revitalization (R2R2R) outcomes that are central to attaining Sustainable and Healthy Communities. The R2R2R framework was developed by ORD & GLNPO to help fulfill Great Lakes Water Quality Agreement commitments “to restore and maintain the chemical, physical, and biological integrity of the Waters of the Great Lakes.” Potential endpoints of analysis include improved water quality, restored designated uses, and/or ecosystem services.
If you or anyone you know that is working on a similar project please contact me at:
How often should I clean it, is it every 6-months/yearly?
Is this protocol right for cleaning?
1st Time we got this water distiller I use salt lemon 0.5 Kilio & turn on the device for 3 hours (twice) & wash it very well with tap water and turn it on for the 3rd time to clean it from any remaining salt lemon.
How often should I test the water quality is it every 6-months/yearly or every time after cleaning?
I have a water quality data set ( Fecal Coliform). This dataset includes right-censored values ( >600), left-censored values (<10), and non-censored values.
Which non-parametric test I can use instead of Kruskal Wallis test followed by multiple comparisons to compare more than two groups?
Can I use Generalized Wilcoxon Test ?
Globally, there are more than 45,000 large dams in operation in over 150 countries and another 1500 or so are currently under construction according to World Wildlife Fund (WWF). Dams and weirs have been built on rivers (a barrier across a river) to achieve a number of benefits including water storage, irrigation supply, drinking water, preventing floods, navigation, hydroelectricity production, and recreation etc. In recent time, most dam construction is taking place in the developing world, such as in China and India. 46 new large dams being planned or under construction in the Yangtze River basin in China; 27 in the La Plata basin in South America; 26 in the Tigris and Euphrates Basin in Turkey, Syria and Iraq. Dams are also planned on three other rivers: the Salween in China, Thailand and Myanmar, the Kizilirmak in Turkey, and the Ganges in China, Nepal, India and Bangladesh.
The development of engineering infrastructure such as dams and weirs over rivers has modified rivers ecosystems threatening the water quality (e.g. salinity, cold water pollution) and water dependent biodiversity (e.g. native fish). Dams disconnect rivers from their flood plains and wetlands, reduce water flows in rivers, and affect the migratory patterns of fish. In general, water retention by dams eliminates or reduces spring runoff or flood pulses that often play a critical role in maintaining downstream riparian and wetland ecosystems including the lifecycle of fish. Older dams release water that is stored at the bottom of the dam, which is typically colder and adversely affects species adapted to warmer temperatures. Such an effect is sometime referred to as ‘cold water pollution’. The construction of a dam on a river can block or delay upstream fish migration between feeding and breeding zones and thus may contribute to the decline and even the extinction of species. As a consequence of dams, for example, some unique species and habitats are/will be threatened including freshwater native fish, river dolphins, porpoises and water birds. One estimate reveals that dams and associated uses of water have altered two-thirds of the world’s major rivers.
In Australia, the Federal Government Department (Commonwealth Environmental Water Office) has acquired/is acquiring water with the goals/objectives to increase water flows in rivers and wetlands (commonwealth environmental water). Reduced flows in the Murray Darling Basin (MDB) have already caused environmental problems (increased salinity, increased algal blooms/cyanobacterial blooms, decline in native fish and bird populations and poor wetland health). This environmental water has been/is being recovered through water saving infrastructure upgrades, water purchases (direct buybacks of water entitlements from irrigators) and other water recovery programmes in order to protect or restore the environmental assets of the MDB. The environmental water will help protect and restore the resilience of the MDB’s rivers, wetlands, floodplains, lakes and red gum forests, together with the plants and animals that depend on them. In a number of countries (e.g. third world countries), people may not be familiar with environmental water or environmental flows and a need for environmental water for biodiversity.
Question: Do you agree that there is a need for environmental water/environmental flows to protect biodiversity where dams have been built or to be built? If so, how can we achieve a balance between water usages for consumptive purposes (drinking water, industry and irrigated agriculture) and meeting the demand for environmental flows for smooth functioning of river ecosystems and river biodiversity?
In water quality assessment, the presence of Pesticides and various organic compounds( including emerging contaminants ) will have a deeper impact on human health and the environment. Even usage of the highly sophisticated HPLC, LC, Methods will also have the financial constraint for the researcher in low-income countries due to lack of funds. Hence What are other alternative methods that would give information on the concentration of the pollutants?
Can a biosensor be utilized?
I am a novice researcher, and i'm working on a project which is busy analyzing water quality data from different water sources such as dams,rivers, and springs , and also from secondary sources such water treatment plants, and households, i have collected water GPS coordinates, which appear on the image* , hence im having difficult to find the right methodology to analyse these results spatially. The microbiological parameters that are going to analysed include bacteria such as E.coli, salmonella spp , Shigella spp, Giardia spp, Entamoba Histolytica spp.
please help and be kind :)
i have attached an image showing the sample locations , additionally the study area is in six Quaternary drainage basins
We have the hatchings of Batagur Dhongka at the Rescue and Rehabilitation Centre. They are healthy and growing well, but the problem is that algae have been found on their carapace. We used to remove it manually, and the algaes are coming back next month. The water quality/aeration is perfect. We are changing it twice a week. We have other species as well, like Batagur kachuga, and they have never found these algae. Would you please tell me some tips on how to remove algae from the Batagur Dhongka carapace permanently?
We are setting up a water filtration system for our bivalves hatchery, the water should be pristine (clear) & clean for to be use in operation.
Seawater was pump directly from the sea, into our sedimentation pond (earthen), then pump into the holding tank in the hatchery that undergo filtration via sand filters.
The water have a slight yellow tint, the colour is very obvious in large volume. Hence, we thought to remedy via chlorination (domestic Clorox) and ozonating the water.
But, instead of purifying the water, it became more orangey-tint, and it stained the water container.
suspect for high concentration of irons, so sent the water from both pond and hatchery for analysis, but the iron level is normal (0.03-0.06 mg/L)
any expert or experiences individual know what/why this occurring and how to remedy the problem?
Recently, our group collect water quality samples at several rainfall event, however we only get 8 samples which isn't enough to run the LOADEST model. Based on simple test about this data, we find a pretty good linear trend, so can I select model 1 and 2 or user predefined formula to predict the load of this event ?
I need an assistance using GIS and RS in mapping out surface water quality parameters? I have downloaded the RS images for my study area.
I need to know the limits of pH, TSS, BOD, COD, temperature, and other effluent characteristics for direct discharge into water bodies in the US and European Union standards.
Any help in this regard is appreciated.
I am currently working on coastal water quality assessment. I need the impacts of SST on tropical cyclone formation and its related processes.
I am currently advising a young student in the National University of El Salvador and he has an interest in working with remote sensing data to study freshwater quality (turbity, pollution, algae blooms, etc). The available data to use is the Copernicus/Sentinels open data from the European Space Agency. The university periodically conducts in-situ studies of the water and collects samples along with the National Ministry of the Environment and Natural Resources.
We think that exploring the correlations between temperature, suspended matter, clorophyll (algae) and data from Sentinel 2/3 (some initial exploration attached). But this is just a very initial/raw idea.
Therefore I would like to be advised on relevant topics in this field of research that are of interest to the global community and not just El Salvador. My ambition is to conduct a research task that can be contributed to international peer-reviewed journals and establish relationships with experts and research groups abroad.
Any suggestions, ideas, contacts will be greatly appreciated.
i am new to water chemistry, i have been looking at trends in the water chemistry parameters, and found there is significant decreasing trend in Stream-water temperature, Ca, Mg, Na, and chloride along with discharge both in the monsoon and non-monsoon seasons.
Like From Jan 1994, Jan 1995, Jan 1996...... Jan 2018 (for Non-Monsoon period) Sept 1994, sept 1995, sept 1996...................Sept 2018 (Monsoon period)
Note- watershed (1000 km2 drainage area, Western Ghats, India) is free from dams and other water structures.
What could be possible drivers of trends in the above parameters?
Please provide your valuable suggestions.
Thanks in advance.
In my study area, water quality data is scary at some period because we don't have automatic machine. But I wish to use limit data to analysis concentration-discharge hysteresis and normalized cumulative load plots.
I have 8 water quality parameters to explain the herbivory rate of sea urchins in seven different sites (80 observations in total). I have done a multiple linear regression and results showed that several parameters are significant drivers for herbivory rate.
I have also done an RDA on sea urchin abundance vs water quality (both multivariate) and visualized it, but somehow I am confused on how to visualize the herbivory (univariate) vs water quality. Is it still possible to do an RDA on this type of data? I understand I can make a residual plot of the regression, but I'm wondering if I could still have ordination arrows on the plot for herbivory vs water quality.
Many thanks, hope the description is clear enough to understand. I appreciate any feedback and suggestions.
After getting my cyanobacteria-water samples, filtering them through GF/F filters, and freezing-thawing them, I use the trichromatic method to get Chl-a concentration.
I am wondering how much "free" (not cell-associated) chl-a is passing through the filter? is it possible to measure that portion that stays in the filtrate? If so, how would I do it?
I am running a nonlinear regression model for water quality parameters. What is the best way of selecting predictors for the regression model and is it good to use many predictors in the regression model?
Can I change Guidance (CCME 2004) canadian in
For example, I use the standards of the W orld Health Agency or the Indian Agency of Health?
Can I change the sheet excel (Guidance) and work on it?
It has become necessary that such sensors be present in fish farms to maintain water quality and control the spread of disease
I did some analysis to compare diatoms obtained from streams and explain their relationships (water quality). Like SIMPER, ANOSIM, PCA, cluster. What other analyzes would you recommend? Thanks..
I have in-situ data of a "water quality parameter" in 2013 and need to predict data for 2019. I have found an index (regarding the spectral characteristics of the water quality parameter) that is calculated from Landsat images in 2013 and then calibrated with in-situ measured data showing R2 ~ 0.7.
Now I have the index calculated from Lansdat for 2019, and the question is how possible is it to get corresponding water quality data from the index, considering the calibrated formula I have from 2013???
Can trend analysis methods be applied to water quality data?
Trend Analysis Methods: Mann-Kendall, Sen's T Test, Spearman's Rho Test, ITA, ITTA and IPTA
Water Quality Data: Daily, Weekly, Monthly and Yearly
Models that evaluate parameters to water quality. For example clorofila a, turbidity, DO, etc.
Models for lakes in the tropical zone.
Water pollution occurs when harmful substances often chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water degrading water quality and rendering it toxic to humans or the environment. What are the environmental effects?
The affected fish (O. niloticus) are three months old. The infected fish were taken for a public display after which this infection started. Water quality parameter for the tank where the fish were stocked are as follows:
D.O. - 6.3 mg/l at 86% sat
Temperature - 25°C
Ph - 8.25
The infection was observed to start from blinding one eye then spread to the other, then the fish stops feeding and dies. The fish died after two weeks from the time of the first observation of infection.
Are there particular impacts on aquaculture?
Also, how does the increase in zooplankton abundance correlate with fish population? Is it also somehow related to the effects of eutrophication?
Will highly appreciate your response on this matter. Thank you so much and have a great day!
I'm studying the relationship between aquatic insects (as biomonitoring medium) and water quality of river. I only have the data for the number of insects/organisms based on their respective orders (ephemeroptera, plecoptera, diptera, odonata). I haven't got the information of what family they are in, so I could not calculate the actual tolerance value for each order of insects.
Is there any alternatives, modified biotic index formula or any other indices that can be calculated using only these information that I have?
Feedbacks are highly appreciated.
I am looking for a standard procedure for determining the bulk reaction rate to undertake a water quality (constituent) analysis. I understand from the AWDM book and other literature that the procedure entails sampling water from the source through bottle tests and making chlorine tests every day and plotting the results on a semi-log chart to get the bulk reaction rate value. However, I need a detailed standard procedure with step-by-step instructions to send to the lab so that they make the tests accordingly and come up with the results. I have made my research online and could not get hold of such a document. I would highly appreciate your help in that regard.
I would also appreciate any help regarding any empirical equation to determine the wall reaction rate, as I understand that it depends on specific factors such as pipe material, age, and other such considerations.
Thanks and best regards,