EVALUATION OF WATER QUALITY INDEX OF WATER BODIES CHANNARAYAPATNA TALUK , KARNATAKA REGION , INDIA

Present communication deals with a study of Physico-chemical parameters such as pH, Temperature, Total Suspended Solids, Turbidity, Dissolved Oxygen, Biochemical Oxygen Demand, Nitrate and Phosphate in water samples of Channarayapatna, Janivara, Anekere and Baghur water bodies in Channarayapatna taluka, Karnataka state of India. The water quality of the samples was compared with standard values given by World Health Organization (WHO) and United State Salinity Laboratory for drinking and irrigation purposes. Water Quality Index (WQI) was also calculated to know the overall quality of water samples. Water quality index (WQI) of Surface water body of various Sampling locations of Channarayapatna taluka, Karnataka ranged between 61.82 and 68.27 indicates the fair quality of water. The water quality index is calculated by indicator (100-point scale) shows that water is suitable for drinking purposes only after pretreatment like filtering, boiling, reverse osmosis and electro dialysis. WQI can play a big role in justifying the water pollution problems after encountered in different surface water bodies. Application of Water Quality Index (WQI) in this study has been found useful in assessing the overall quality of water and to get ride of judgment on quality of the surface water.


Introduction
The term "water quality" includes the water column and the physical channel required to sustain aquatic life.The goal of the federal Clean Water Act, "To protect and maintain the chemical, physical and biological integrity of the nation's waters," establishes the importance of assessing both water quality and the habitat required for maintaining other aquatic organisms.Water, the precious gift of nature to human being, is going to be polluted day-by-day with increasing urbanization.
It is well known fact that potable safe water is absolutely essential for healthy living.Adequate supply of fresh and safe drinking water is a basic need for all human beings on the earth.The problem of drinking water contamination, water conservation and water quality management has assumed a very complex shape.Attention on water contamination and its management has become a need of our because of far reaching impact on human health.The major hazard in drinking water supplies is microbial contamination, which is due to agricultural land wash, domestic sewage, industrial effluents, improper storage and handling (WHO, 2006;Saha et al., 2006).
The use of water quality indices (WQI) is a simple practice that overcomes many of the previous mentioned problems and allows the public and decision makers to receive water quality information (AOAC) (1995).The major tool of pollution profile studies is the water quality index (WQI).Horton proposed the first formal WQI in the literature in 1965 (Ott, 1978).Water Quality Index (WQI) is regarded as one of the most effective way to communicate water quality (Kannan, 1991;Pradhan, et al., 2001).In a number of nationwide studies, water quality of different natural resources was assessed on the basis of calculated water quality indices (Sinha, et al., 2001;Rajmohan, 2003).The data obtained through quantitative analysis and WHO water quality standards8 were used for calculating water quality indices.The purpose of calculating WQI and comparing it with the standards is to assess drinking water contamination Research Article at selected water body at Channarayapatna taluka and seasonal variation of water quality after the onset of monsoon on the basis of calculated values of water quality indices.
A water quality index is a means to summarize large amounts of water quality data into simple terms for reporting to management and the public in a consistent manner.Similar to the UV index or an air quality index, it can tell us whether the overall quality of water bodies possess a potential threat to various uses of water, such as habitat for aquatic life, irrigation water for agriculture and livestock, recreation and aesthetics, and drinking water supplies.Water quality index (WQI) is a single value indicator to the water quality.It integrates the data pool generated after collecting due weights to the different parameters.

Study Area
The study was carried out at selected water body in Channarayapatna taluk, which are a balancing and maintained to serve water requirement for irrigation and other human activity.The water samples from the identified water bodies were collected at an interval of 30 days and analyzed for 14 physico-chemical parameters as per the standard method (APHA, 1989).The study area is shown on a satellite image with 4 sampling stations.The present study was conducted along the priority road which is of 18 Kms in length, touching 4 villages (water body) namely -Channarayapatna, Janivara, Bagura and Anekere.The Latitude and longitude ranges given in Table 1.Water quality index is calculated to determine the suitability of water for drinking purposes (Srivastava and Sinha, 1994;Das et al., 2001;Joshi, et al., 2004;Bhoi, et al., 2005).Water sampling index in is given in Fig. 1.

Laboratory Analysis
In order to determine the water quality index, surface water samples were collected at selected water body from two sampling sites at each water body during June 2010 to January 2011.The samples were collected in sterilized bottles using the standard procedure for grab samples in accordance with standard methods of (Ramakrishniah, C.R., et al., 2009).The samples were analyzed as per standard methods for thirteen Physico-Chemical parameters namely; pH (Hydrogen ion concentration), Turbidity, EC (Electrical conductivity), TDS (Total Dissolved Solids), TS(Total Solids), DO (Dissolved oxygen), BOD (Biochemical Oxygen Demand) and COD (Chemical Oxygen Demand), , TH (Total hardness), Total Alkalinity (TA) ions of Ca 2+ (Calcium), NO3 (Nitrate) and Cl - (chloride), and Phosphate (PO4).In situ measurement was adopted to determine unstable parameters including; pH, EC and DO by portable meters.The analysis of the parameters total hardness and ions of each calcium, magnesium, chloride and Free CO2 were carried out by volumetric analysis in accordance with standard methods of (Ramakrishniah, C.R., et al., 2009).

Calculation of WQI
The Water Quality Index (WQI) was calculated using the Weighted Arithmetic Index method.The quality rating scale for each parameter qi was calculated by using this expression (Sinha, D. K., et al., 2004).
Quality rating, Qi = 100 [(Vn -Vi) / (Vs -Vi)] Where, Vn: actual amount of nth parameter Vi: the ideal value of this parameter Vi = 0, except for pH and DO.Vi = 7.0 for pH; Vi = 14.6mg/L for DO.

Vs: recommended WHO standard of corresponding parameter
Relative weight (Wi) was calculated by a value inversely proportional to the recommended standard (Si) of the corresponding parameter.
Wi = 1/ Si, WQI are discussed for a specific and intended use of water.In this study the WQI for human consumption is considered and permissible WQI for the drinking water is taken as 100.The overall WQI was calculated by using Equation: Water Quality Index (WQI) =Σ(Qi)Wi /ΣWi (WQI)

Results and Discussion
Physico  2).The result showed that the drinking water of selected water bodies from Channarayapatna taluk is fit for drinking in terms of TDS.
The classification of groundwater, based on total hardness shows that no on water samples from selected water bodies in channarayapatna fall in the within the permissible limit of WHO, BIS and ICMR category.The maximum allowable limit of total hardness is 500 mg/l and the most desirable limit is 300 mg/l as per the WHO, BIS and ICMR standards (Table 2).For total hardness, the most desirable limit is 80 mg/L to 100 mg/L Hardness below 300 mg/l is considered potable but beyond this limits cause gastrointestinal irritation (ICMR 1975).Normal water hardness does not pose any direct health problems.Jain et.al 1998 reported that high concentration of hardness (150 to 300 mg/l and above) May cause kidney problems.From the study it reveals that all the selected water bodies were showing the hardness content is within the permissible limit of drinking water standards.Calcium and Magnesium content in selected water bodies samples were found within the permissible limit given by WHO standards (75 mg/l) except Channarayapatna and Janivara which is very near to the source of Agricultural runoff.The value of SD of calcium and magnesium of water samples is for Channarayapatna, Bagur, Janivara and Anekere water bodies are computed as ±12.10, ±13.79, ±5.10, ±5.14 and ±6.75, ±8.27, ±2.45 and ±2.31 respectively.The alkalinity range set by WHO is 500 mg/L.The result on alkalinity of water samples from selected water bodies showing the alkalinity found 232.50, 248.25, 179.0 and 188.25 mg/L.Minimum alkalinity found in Janivara water body was 179.0 mg/L (Table 4).The maximum range of alkalinity is 232.5 mg/L (Table 3).Free Carbon Dioxide content of water samples of channarayapatna taluk, Hassan district of Karnataka ranged from 2.3 mg/L at east region to 3.4 at south region in channarayapatna, 1.2 mg/L north region to 2.6 mg/L in Bagur, 0.9 mg/L to 2.6 mg/L in Janivara and 0.6 mg/L to 2.1 mg/L in Anekere water body respectively.The value of SD of free carbon dioxide of water samples is for Channarayapatna, Bagur, Janivara and Anekere computed as (±0.46, ±0.59, ±0.74 and ±0.62).
Chloride: Chloride values ranged from 17.89 mg/L at south region of Janivara water body to 85.18 mg/L at south region of channarayapatna water body.High chloride content can cause high blood pressure in people.Chloride in excess (<250 mg/l) imparts a salty taste to water and people who are not accustomed to high chloride may be subjected to laxative effect.High Chloride concentration is also an indicator of large amount of organic matter.Present study reveals that all the water bodies were showing the chloride content within the permissible limit of prescribed standards.Dissolved oxygen concentration of selected water bodies ranged from 5.20 mg/L to 6.36 mg/L in Channarayapatna water body, while in Bagur water body 5.40 mg/L to 7.40 mg/L.Janivara water body is ranged from 6.32 mg/L to 8.10 mg/L and in Anekere water body is 6.5 mg/L to 7.98 mg/L of Hassan District, Karnataka.All water samples of Karnataka Hassan region were found within the permissible limit given by WHO, BIS and ICMR.The SD values of DO in water samples is for Channarayapatna, Bagur, Janivara and Anekere computed as ±0.59, ±0.89, ±0.73 and ±1.59 respectively).The scope of parameters is limited to evaluation indicators or criteria that are representative of the type of pollution.BOD and COD both parameters are interdepended at the ration of 1:3.From the present also reveals the same trend.The average BOD content of water samples of Channarayapatna, Bagur, Janivara and Anekere water body are 6.0, 3.61, 3.02 and 3.67 mg/L.The average COD content of water samples of Channarayapatna, Bagur, Janivara and Anekere water body are 14.93, 10.50, 9.0 and 9.55 mg/L respectively.Except channarayapatna water body, all other three water bodies of Hassan District Karnataka State was found within the permissible limit given by WHO; BOD 5 mg/l (5 days at 20 o C). quality of water and to get rid of judgment on quality of the surface water. The analysis reveals that surface water from channarayapatna taluka of Karnataka is poor for drinking purpose as per the water quality index.However, this water can be used for drinking purpose after purification treatment followed by disinfection before consumption and it also need to be protected from the perils and contaminations and quite good for irrigation purpose.

Table 1 :
Surface This paper can be downloaded online at http://ijasbt.org & http://nepjol.info/index.php/IJASBT The pH is measure of the intensity of acidity or alkalinity and the concentration of hydrogen ion concentration.pH has no direct adverse effects on health; however, higher values of pH hasten the scale formation in water heating apparatus and also reduce germicidal potential of chloride.Janivara and Anekere) ranged from 342.0 mS/cm to 724.0 mS/cm at East and south regions og Bagur and Channarayapatna water body.The results show that EC values high in Channarayapatna and low in Bagur.Prescribed standard values by WHO for EC is 1400 mS/cm.The value of EC is very low (342.0mS/cm) in the water of Bagur water body.
-chemical characteristics of Surface water quality at four region of Channarayapatna, Janivara, Bagur and Anekere water body at Channarayapatna Taluk of Karnataka state are given from Tables 2 to 5 respectively.It should be recognized that, like dissolved oxygen, pH varies naturally due to the photosynthesis and respiration cycles in the presence of algae in Channarayapatna water body.

Table 3 :
Physico-chemical characteristics of surface water of Channarayapatna Water body

Table 3 :
Physico-chemical characteristics of surface water of Channarayapatna Water body

Table 4 :
Physico-chemical characteristics of surface water of Bagur Water body

Table 5 :
Physico-chemical characteristics of surface water of Janivara Water body

Table 8 :
Water Quality Index (WQI) of Surface Water at Various Sampling Locations Hassan District Karnataka State ranged from 61.82 to 68.27 indicates the fair quality of water.WQI was calculated to find the suitability of water for drinking only after pretreatment like filtering, boiling, reverse osmosis and electro dialysis.An appropriate method for improving the surface water quality in the affected areas is considered for suitable treatment.WQI values ranges from 100 (excellent) to 0 (very poor).WQI scores were grouped into one of five categorized that serves to summarizes the overall state of water quality.The categories and category description are in Table8.


Water quality index (WQI) of Surface water body of various Sampling locations of Channarayapatna taluka, Karnataka ranged between 61.82 and 68.27 indicates the fair quality of water.Water is suitable for drinking purposes only after pretreatment like filtering, boiling, reverse osmosis and electro dialysis. WQI can play a big role in justifying the water pollution problems after encountered in different surface water bodies.Application of Water Quality Index (WQI) in this study has been found useful in assessing the overall