Dam in upper east region of ghana in order to assess its. In formulation of water quality index the relative importance of various parameters depends on intended use of water. Water quality assessment in terms of water quality index wqi. Water quality index wqi provides a single number that expresses overall water quality at a certain location and time, based on several water quality parameters jena et al. The chemical instability of water quality shows the occurrence of scale deposition and corrosion which can cause secondary pollution of water quality, increase energy consum p. This webbased software application was designed to provide a simple, convenient way to express multiple water quality parameters into a single, easy to understand value. Subindex rating curve calculation subindex scores for each. Calculate water quality index wqi using formula, wqi. A sensitivity analysis of the canadian water quality index there are three factors in the index, each of which has been scaled to range between 0 and 100. Water quality assessment based on the water quality index. The ground water samples of all the selected stations from the wards were collected for a physiochemical analysis.
Water quality index is one of the most effective tools 14 to communicate information on the quality of water to the concerned citizens and policy makers. According to the book field manual for water quality monitoring, the national sanitation foundation surveyed 142 people representing a wide range of positions at the local, state, and national level about 35 water quality tests for possible inclusion in an index. The use of water quality index method to determine the potability of. The objective of water quality index is to turn complex water quality data into information that is understandable and used by the public. Water quality index wqi, using the water quality data being very useful for. The contribution of lake prespa to the water supply of the. Wqi indicates the quality of water in terms of index number which represents overall quality of water for any intended use. The present study aimed to calculate water quality index wqi by the analysis of thirteen physicochemical parameters on the basis of weighted arithmetic index in order to assess the suitability of water for drinking, irrigation purposes and other human uses. During the years have been formulated several water quality indices by some national or international organization, applied for evaluation of water quality in particular cases. The water quality index will be performed by aggregating all parameters to produce a final index score. The waterquality index can be a good tool for presenting waterquality data. A water quality index wqi is a means by which water quality data is summarized for reporting to the public in a consistent manner. Dec 21, 2017 water quality assessment based on wqi. Using the book field manual for water quality monitoring, the national sanitation foundation surveyed 142 people representing a wide range of positions at the local, state, and national level about 35 water quality tests.
The present study is estimation of water quality index using weighted arithmetic water quality index meth od. The present work is aimed at assessing the water quality index wqi for the ground water of indore city and its industrial area. Water quality changes in drinking water distribution systems occur as a result of complex and often interrelated chemical and biological processes 4. From 2009 to 2014, the average wqi value in lake poyang was 42. Hence wqi is a very effective method for determining the quality of water. Drinking water quality index water resources management. The scope f1 represents the extent of water quality guideline noncompliance over the time period of interest. Pn 55 a sensitivity analysis of the canadian water quality. February 2006 water fact sheet 20068 why a water quality index. Mostly it is done from the point of view of its suitability for human consumption. Structure, aggregation formula and number of variables in water quality index wqi and some references using them.
Monitoring the quality of surface waters wqi calculator. The attempt was supported by the national sanitation foundation nsf and therefore as nsfwqi in order to calculate wqi of various water bodies critically polluted. This can be attributed to the multiple discharge points. In current study, water quality index wqi was calculated by using the weighted arithmetic index method as described by 12. The air quality index aqi is a simple, colorcoded, unitless index that is an effective way to communicate air pollution concentrations to the general public the aqi provides an indication of the quality of the air and its health effects options exist for scaling the aqi categories to pm 2. It is defined as a rating reflecting the composite influence of different water quality parameters were taken into consideration for the calculation of water quality index wqi. Mathematical computation of water quality index of vea. Therefore, water quality index wqi is a very useful and efficient method which can provide a simple indicator of water quality and it is based on some very important parameters.
Water research center water quality index calculator. The wqi has been calculated by using standards of drinking water quality recommended by the world health organization who and indian council for medical research icmr. Oip analysis was helpful in determining surface water quality. Ryznar gives only an indication about the aggressiveness of the water but carrier gives an indication about the scale and corrosion potential of the water. It is an excellent format for sum marizing overall waterquality conditions over space and time. Nine factors were chosen and some were judged more important than others, so a. Calculation of water quality index in this study, for the calculation water quality index, thirteen important parameters were chosen. The water quality index is really important as it can describe the water quality condition at a particular location at a specific time using. Canadian soil quality guidelines for the protection of environmental and human health. Water quality index is a 100point scale that summarizes results from a total of nine different measurements when complete. Water quality index users manual 2017 synthesis of research and application of the ccme water. Water quality index wqi, using the water quality data being very useful for the modification of the policies. Rating scale is developed based on the tolerance limits of inland waters and health point. Canadian water quality guidelines for the protection of.
The source for water quality data used to analyze and validate the index calculations is. Evaluation of water quality index for river sabarmati. The figures and diagrams were created by kelly hodgson. Water quality assessment in terms of water quality index. Mathematical computation of water quality index of vea dam in. Langelier and aggressive indices method 8073 langelier saturation index the langelier saturation index li, a measure of a solutions ability to dissolve or deposit calcium carbonate, is often used as an indicator of the corrosivity of water. Parameters selection for water quality index in the. Mathematical computation of water quality index of vea dam 15 conclusion and recommendations the objective of the study was to calculate the water quality index wqi of vea dam in upper east region of ghana in order to assess its suitability for drinking purposes. Water quality assessment using overall index of pollution. Calculation of the langelier index newfoundland and labrador.
It is similar to the uv index or an air quality index, and it tells us, in simple terms, what the quality of drinking water is from a drinking water supply. The objective of the study was to calculate the water quality index. Pdf mathematical computation of water quality index for the. Tushemisht and gurras springs is very important 34. Water quality index for the assessment of water quality from. Calculation of the drinking water quality index essentially, the wqi model consists of three measures of variance from selected water quality objectives scope. Water quality index calculator water research center. Index nsfwqi, canadian council of m inistries of the environment water quality index ccmewqi, oregon water quality index owqi and weighted arithmetic water quality index methodwawqi. For open ocean waters where the depth is substantially greater than the euphotic zone, the ph should not be changed more than 0.
Kevin rafferty, scaling in geothermal heat pump systems, u. Jul 26, 2015 an attempt has been made to develop water quality index wqi, using six water quality parameters ph, dissolved oxygen, biochemical oxygen demand, electrical conductivity, nitrate nitrogen and total coliform measured at three different stations along the sabarmati river basin from the year 2005 to 2008. Global drinking water quality index the united nations. The values of the three measures of variance from selected objectives for water quality are combined to create a vector in an imaginary objective exceedance space. Pdf water quality indices important tools for water quality. Once all information about the situation of the water body, water usage purposes, and other the key factors of this area are obtained, an appropriate water quality index will be selected the water quality parameters evaluated for in the. The city and county of denver s ccod department of public health and the environment ddphe has been collecting water quality samples from streams and lakes within denver for almost 50 years. Using the book field manual for water quality monitoring, the national sanitation foundation surveyed 142 people representing a wide range of positions at the local, state, and national level about 35 water quality tests for possible inclusion in an index. In this study area the water quality index varies between 10 and 23 and hence falls under the good water quality category. Arithmetic index of quality of water method gives better results but here we will discuss about a method which is given by dr. The objective of the study was to calculate the water quality index wqi of vea.
The water quality volume is the volume of runoff from 1. Wqi calculations denoted that the quality of the water is decreasing as moving downstream. A water quality index provides a convenient means of summarizing complex water quality data and facilitating its communication to a general audience. Calculation of the langelier index the langelier index li is an approximate measure of the degree of saturation of calcium carbonate in water. Calculate the water quality index of a surface water. Water quality index methodology city and county of denver. The equation to calculate the water quality volume is shown below and can. Global drinking water quality index development and sensitivity analysis. A usual water quality index method was developed by paying great rigor in selecting parameters, developing a common scale and assigning weights. The blockage of the river flow was adopted as a flood control measure to protect its riparian areas, especially the nagaon town. It, thus, becomes an important parameter for the assessment and management of groundwater. Calculating nsf water quality index iowa state university.
Selected parameters used in the index calculation are based on historical, social and natural conditions since lot of differences are expected, according to the different countries and area 6. It can be used in trend analyses, graphical displays, and in tabular presentations. For the water quality index calculation were used six physicochemical parameters. The parameters were measured periodically at 10 sampling sites during. Welcome to the water quality index for runoff water from agricultural fields wqiag. Water sample collected results for multiple water quality parameters selected index water quality parameters. The calculation of wqi was made using weighed arithmetic index method brown et al,1972 in the following steps. The index is not related directly to corrosion, but is related to the. Essentially the wqi is calculated 42 kb by comparing. Ddphe has developed a water quality index wqi with the objective of turning water quality data. Evaluating water stability indices from water treatment. Global drinking water quality index authorship the main authors of this report are carrie rickwood and genevieve m. A calculation of wqi min based on these four parameters wqi minb classified water quality in s2 as medium average scores between 58 and 63 in three different flow conditions and annual period whereas other impacted points as good the index scores between 76 and 88. Jul 27, 2016 the kolong river of nagaon district, assam has been facing serious degradation leading to its current moribund condition due to a drastic human intervention in the form of an embankment put across it near its takeoff point from the brahmaputra river in the year 1964.
Water quality index determination of ponds in anad panchayath. Assessment of water quality index for the groundwater in. Water samples collected from eight sampling stations selected for the analysis were given bellow. The water quality index can be a good tool for presenting water quality data. The equation to calculate the water quality volume is shown below and can be found in chapter 1. The water quality index wqi weighted arithmetic method calculation analysis, can any body explain in details. The wqi is calculated by using the expression given in equation 7. National recommended water quality criteria aquatic life. Evaluation of water quality index for drinking water.
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