Comprehensive information and knowledge about the quality of water resources plays a very important role in preservation plans for water resource management. One of the engineering methods used to assess river water quality conditions without mathematical and statistical complexity is water quality indices. In this method, different water quality parameters are analyzed and interpreted in a river water quality assessment study. It is one of the most important parts of river quality monitoring plans in which the qualitative indices are converted to a single and dimensionless number. water quality classification is undertaken on the basis of the value of the indices comparing with a predefined rated scale. In this study, a monitoring plan is achieved for the 18 stations located along with Gheshalgh River in Kurdistan province in Iran. water quality assessment has been conducted using two NSF quality indices of general water use and the British Columbia index for drinking and agricultural consumption. Based on the results obtained from these indices, water of this river has the worst quality due to agricultural use downstream of the wastewater treatment plant of Sanandaj city. Its condition is degraded up to the discharge point of Morghe Par slaughterhouse due to the assimilation capacity of the river. In this location water quality is acceptable for drinking purposes and most of the stations have appropriate conditions except for Dare Kuleh and the downstream station which are on the border. Results indicate that the degree of influence of urban pollutant sources such as entry of urban wastewater and also of a landfill leachate brook is high, especially in the Gheshlagh bridge area up to the tributaries.

In this paper the role of geological formation Fars Group (Gachsaran, Mishan and Aghajari) on aquifer water quality Dehdasht West has been studied. Considering the characteristics of stratigraphy, permeability, susceptibility to erosion and hydrodynamic characteristics of this formation is observed in the western Dehdasht Dehdasht West lacks a suitable aquifer for agricultural development in this section. Dehdasht lands west of Agriculture are very fertile, but underground water resources for irrigation in this desert land with this is limited. In Western Deadest lack or limited and seasonal surface water resources, rural agricultural lands to make drinking water from underground (well mostly) world are, as 70% land water resources ground water irrigation, but are Due to geological conditions of quantity and quality of underground water resources is not conducive for agriculture.On this basis to achieve results from chemical analysis and classification of water in the western plains Deadest chemical results Canola water wells were used and then Volvos diagram was drawn to this desert aquifer. These results show that generally the area between ground water and high salinity level is too salty and dominant in terms of sodium adsorption ratio in the range of low waters and underground water resources generally in the class C 3 S 1 (high salinity with low sodium adsorption ratio) and C 4 S 1 (very high salinity with low sodium absorption ratio) are placed. Ground water lands west Deadest component is considered salty waters and groundwater in the area of agricultural use are limited. In this paper three factors of geology, physical properties and aquifer quality of its chemical structure has been examined.

Safe water supply needs of living creatures; especially human life is the need to control it using a quality control laboratory tests and indexes is different. Standards for water quality parameters in water resources (including rivers, lakes and...) from different experts are used primarily to control the quality index calculated from results obtained for several tests that show water quality is. water quality index to compare the quality of water resources with other resources and also to determine the health of a watershed in the different parts are used. Meanwhile, water quality control for a specific time period to understand the changes in water ecosystems are also used.

The Choghakhor International Wetland plays an important role in preserving and protection of part of the plant and animal species in the Iranian plateau. Since the water of this wetland is utilized for different human purposes, complete periodic chemical and physical quality assessment of its water seems necessary. water quality index (WQI) was calculated using the following eleven parameters: Nitrate, Nitrite, Ammonium, Alkalinity, Hardness, Turbidity, Conductivity, Dissolved Oxygen, Total Dissolved Solid, pH and Biochemical Oxygen Demand (BOD5). For this purpose, the relative weight assigned to each parameter ranged from 1 to 4 based on the importance of the parameter for aquatic environment and human health. The analyses of variance (ANOVA) of data revealed significant differences between different periods of sampling (p<0.01). Therefore we assigned the results in two categories: very poor and inappropriate, which make it not suitable for human uses such as drinking. The most important factor in assessment of water quality in this study was BOD5. The result of this research demonstrated that this method can be used for assessment of water quality in wetlands.

Background and Objective: With the industrialization of communities, population increase and use of surface water, river pollution has been increased by agricultural, industrial pollutants and urban wastewater. Therefore, investigation of river pollution for regional and environmental planning is of great importance. To evaluate surface water pollution, a number of surface water quality indices have been investigated. Materials and Methods: Iran water quality index for surface water resources (IRWQISC) approach was used to evaluate the water quality of the Mahabadchai river, Iran. Sampling was carried out along the Mahabadchai river based on some criteria such as approximately to drainage areas for landfills/domestic and agricultural effluents. Results: Pearson correlation coefficient between physical, chemical and microbial parameters of water showed that fecal coliform, BOD, COD, nitrate, ammonium, phosphate, turbidity and total hardness had a significant positive relationship with each other at 99% confidence. According to this index, upstream samples of the river are classified as good, mid-stations relatively good to moderate category, and downstream samples of the river are classified as relatively bad. Conclusion: Based on the relationship between each variable, fecal coliform, BOD, COD, ammonium, and turbidity were more effective in determining the IRWQISC. Most of the examined variables showed low concentrations in upstream areas of the river while their concentration gradually increased along the river to downstream areas, especially close to urban and industrial districts.

Background and Objectives: Aydughmush dam was built on Aydughmush River at 19 km in southwest of Mianeh City. The dam is multipurpose and its main aims are the spring floods control, supplying potable water for villages and providing irrigation water. Different pollutants which probably discharge to the river finally enter to the dam reservoir so; this study focuses on evaluating the quality of the dam reservoir.Materials and Methods: In this cross sectional study standard field parameters including dissolved oxygen, temperature, Biochemical and chemical oxygen Demand, Most Probable Number of Coliforms, Fecal Coliform, Turbidity, Total Dissolved Solids, Total Solids, pH, conductivity and others were measured at eight different stations during the spring and summer in 2010. Sampling points were selected on the basis of their importance. water quality index was calculated using water quality index calculator given by National Sanitation Foundation (NSF) information system.Results: The highest value of WQI of the samples was 84.89 in A3 station in July while the lowest value was 67.96 in A2 station in May. The lower value of WQI has been found mainly due to the slightly lower value of DO in the dam reservoir water. Most of the water samples were found within Good category of National Sanitation Foundation water quality Index (NSF-WQI). Comparison of the measured parameters based on the sampling stations and various months by variance and t-student analysis showed a significant relationship for some parameters (P<0.05). Nutrient budget determination indicates that the concentration of phosphate, nitrite, nitrate and ammonia at inlet are higher than outlet of the dam reservoir.Conclusion: The calculated (WQI) showed good water quality. Based on the results of NSFQWI calculations, the dam reservoir water quality is suitable for various purposes.

water is a unique natural resource among all sources available on earth. It plays an important role in economic development and the general well-being of the country. This study aimed at using the application of water quality index in evaluating the ground water quality innorth-east area of Jaipur in pre and post monsoon for public usage. Total eleven physic-chemical characteristics; total dissolved solids, total hardness, chloride, nitrate, electrical conductance, sodium, fluorideand potassium, pH, turbidity, temperature) were analyzed and observed values were compared with standard values recommended by Indian standard and World Health Organization. Most of parameter show higher value than permissible limit in pre and post monsoon. water quality index study showed that drinking water in Amer (221.58, 277.70), Lalawas (362.74, 396.67), Jaisinghpura area (286.00, 273.78) were found to be highly contaminated due to high value of total dissolved solids, electrical conductance, total hardness, chloride, nitrate and sodium. Saipura (122.52, 131.00), Naila (120.25, 239.86), Galta (160.9, 204.1) were found to be moderately contaminated for both monsoons. People dependent on this water may prone to health hazard. Therefore some effective measures are urgently required to enhance the quality of water in these areas.