Global J. of Engg. & Appl. Sciences, 2011: 1 (4) Research Paper: Rahim et al., 2011.Pp.79-82 ASSESSMENT OF GROUNDWATER QUALITY IN BORUJEN, FARADONBEH, AND SEFIDDASHT PLAINS Rahim Alimohammadi Nafchi, Manoj Khanna, Singh, D.K., Singh. M and R.N. Sahoo* Water Technology Centre, Indian Agricultural Research Institute, New Delhi 110012. *Agricultural physics, Indian Agricultural Research Institute, New Delhi 110012 Corresponding author: [email protected] ABSTRACT The Borujen, Faradonbeh and Sefiddasht, watershed in Chaharmahal and Bakhtiari, Iran, is one of the semi arid regions. Layers of earth are calcareous in the watershed. Assessment of water quality has been carried out to determine the sources of dissolved ions in groundwater. Groundwater is an important water resource in the study area; these resources are under threat of pollution from human activities. The quality 2+ 2+ + + -2 2- - assessment is made through the estimation of Ca , Mg , Na , K , Cl-, SO4 , CO3 , HCO3 , and total hardness as CaCO3, EC, and pH. Based on these analyses, parameters like sodium adsorption ratio (SAR), percent sodium (%Na), residual sodium carbonate (RSC), potential salinity, and permeability index (PI) were calculated. Groundwater quality, forecasting water quality in response to groundwater recharge, discharge with another sources and cited calcareous geological region (through (to pass) from the sediment and dissolution of water soluble minerals), Groundwater quality assessment indicated that water is suitable for irrigation purpose as per FAO standards except higher value of Electrical Conductivity (EC) in some area. Water for drinking purpose was found to be good as per WHO (1982) standards except for high values of water hardness. The results of this study will be used for developing ground water management plans. Key words: Groundwater quality, assessment, quality, electrical conductivity and water management. INTRODUCTION The usage of groundwater has gradually increased main cause of aquifer pollution. The heavy impact because of the increase of water demand and the of urbanization was observed through the shortage of surface water during growth of deterioration of water quality in the aquifer. The population and rapid industrialisation. In many study recommended improving waste water cases groundwater is polluted by the inflow of disposal system to improve water quality of aquifer. pollutants such as sewage and industrial Srivastava and Ramanathan, (2008) carried out wastewater (Freeze and Cherry, 1979). Generally, geochemical and study the landfill effect on groundwater quality depends on the quality of groundwater quality. The results showed that there recharged water, precipitation, inland surface was high contamination of groundwater due to water and subsurface geochemical processes leaching pollutants from the landfill. The nitrate, (Twarakavi and Kaluarachchi, 2006). The study of fluoride and heavy metal pollution was at alarming Babiker et al., (2007) showed that major chemical state with respect to drinking purpose. elements including pH, EC, Na+, K+, Ca+2, Mg+2, Cl-, Khodapanah et al., (2009) carried out groundwater HCO - , SO -2 and water hardness played a 3 4 quality assessment, through their chemical significant role in classifying and assessing composition and suitability for irrigation use. The groundwater quality. Groundwater is under threat results of the study indicated that, the study of pollution from human activities. The concluded that-salinity is the principal concern in groundwater quality is growing concern in the area. irrigated agriculture in Eshtehard area. For Because in the region due to expansion, and various sustainable agricultural development in the study activities including agriculture (with the using of area, special management of salinity control with pesticides and chemical fertilizers), residential and salt-tolerant plantation should be implemented. industrial (factories are with different products Srinivasamoorthy et al., (2009) concluded that the atc.) and there is artificial recharge project in the results indicated that there is an abundance of study area, there are cases that, we selected this major ions in the groundwater which were order of project and carried out it. Several studies were Na > Ca > Mg > K=Cl>HCO3>SO4>NO3 Hydro carried out to assess the ground water quality in chemical facies demarcated was Ca-Mg-Cl, Na-Cl, relation to water demand for an area to develop Ca-HCO3, Ca-Na-HCO3 and Ca-Cl type. NO3, Cl, SO4 groundwater utilization and management plans. and F exceeded the permissible limit during both Following paragraphs details some of key research the seasons. The influence of anthropogenic works (Ghorban et al., 2011). activities such as intense agricultural practices like Khazaei et al., (2004) carried out a study the application of fertilizers, irrigation practice, urban groundwater samples were analysed for 43 wells in and industrial waste discharge influenced the the study area for nitrogen, phosphorous, chloride quality of groundwater in the study area. and bacterial contaminations. The study observed Aghazadeh and Mogaddam, (2010) taken result that the system of absorbing wells are a good that, the sequence of the abundance of the major source for groundwater recharge, however, was the ions was found to be in order of: Ca > Mg > Na > K Global Journal Engineering and Applied Sciences - ISSN 2249-2631(online): 2249-2623(Print) - Rising Research Journal Publication 79 Global J. of Engg. & Appl. Sciences, 2011: 1 (4) and HCO3 > SO4 > Cl. The dominant hydro chemical was used for the assessment of groundwater facieses of groundwater was Ca, HCO3 and Ca, Mg, quality in this study. The samples were analysed for 2+ 2+ + + - -2 - HCO3. Distribution of the groundwater samples in Ca , Mg , Na , K , Cl , SO4 , HCO3 , total hardness as rectangular diagram revealed that all of the samples CaCO3, EC, and pH. This study utilized seasonal fell under the calcium-magnesium-bicarbonate (four seasons; spring, summer, autumn and winter) category. Irrigation waters classified based on SAR groundwater quality data collected from the field in had indicated that 83% of samples belonged to the observation wells. The data collected from the excellent, 11% samples good and remaining to source were transferred into a database hosted on a doubtful category. Base on the classification of GIS platform for spatial analysis and data irrigation water according to the PI values, the visualization. The quality parameters estimated groundwater quality of the study area could be were like Sodium Adsorption ratio (SAR), Percent designated as class II (25–75%) indicating Sodium (%Na), Residual Sodium Carbonate (RSC), suitability of groundwater for irrigation purposes. water hardness and Permeability Index (PI). The Studies presented in the previous review used groundwater quality is categorized into various chemical analyses which determined the levels based on the FAO and WHO standards for the concentration of cat ions (calcium, magnesium, purpose of irrigation and domestic use respectively. sodium and potassium) and anions (chloride, Water index for Irrigation: The characteristics of bicarbonate and sulphate), pH and EC. Some studies irrigation water that have been used in determining calculated some indexes including: SAR, water its quality are including, pH, EC, SAR, %Na ratio PI hardness, pH, RSC, PI, %Na, TDS and EC. Most of and RSC. These standards are presented in Table 2. these parameters are used in various standards like The drinking water quality is analysed based on ISI, WHO, and FAO. Knowledge of these parameters WHO standards based on water hardness, Cl, Na will be helpful in setting proper management for and SO4 values. These standards are presented in Table 1. drinking and agriculture use. In this study FAO standard were used to check suitability for RESULTS AND DISCUSSIONS irrigation purpose and WHO standard for drinking Groundwater quality assessment: Groundwater water quality (APHA, 1992). quality was assessed based on key elements and MATERIAL AND METHODS parameters for the Borujen, Faradonbeh and Sefiddasht watershed. The observed values of key Description of study area: The study area is elements and parameters were analysed through located between 31○, 15′ to 31○, 45′ Northerly ○ ′ ○ ′ GIS and various periodic maps were developed. Latitude and 51 , 25 to 51 , 40 Eastern Longitude Following sections details the results of the in port of Iran (Borujen, Faradonbeh and Sefiddasht groundwater quality assessment catchment in Chaharmahal and Bakhtiari province, a) Potential of Hydrogen (pH): The pH values South western Iran). Soils of study area are heavy area monitored periodically (October, January, and fertile. Area suffers from water shortage due to April and July) during the year. The results indicate this large part of the area is not under productive that majority of the groundwater is of good quality. use. The maximum, minimum and average However, there was variation in the pH values year temperature of the region (Borujen Metrological to year depending upon the rainfall and runoff in o o o Station) is 34.6 , - 24.6 and 10.6 C respectively. the region. pH values in autumn and winter of The annual average rainfall, evaporation and mean 2003-04, 2004-05 years was about 88.5 per cent of relative humidity of the area are 243 mm, 2087 mm plain area with suitable value (6.5- 8.4) and 11.5 and 38% respectively. per cent area under the range higher than normal Assessment of Groundwater