the importance of groundwater as a source of water supply in arid, semi –arid areas in recent years due to the uncontrolled exploitation of groundwater have been doubled. uncontrolled exploitation has been caused a drop in the water table in many areas of the country, including this region. with replace methods of modern irrigation instead of traditional irrigation methods can prevent drop the ...

background: unsustainable development of human societies, especially in arid and semi-arid areas, is one of the most important environmental hazards that require preservation of groundwater resources, and permanent study of qualitative and quantitative changes through sampling. accordingly, this research attempts to assess and analyze the spatial variation of quantitative and qualitative indica...

water quality is a worldwide problem which affects human beings lives fundamentally. water scarcity is intensified in result of quality deterioration. different factors such as population increase, economic development and water pollution could be considered as the origins of the problem. the study and forecasting of water quality is necessary to prevent serious water quality deteriorations in ...

objective: mashhad metropolis as the second largest religioncity in the world and the second largest metropolis of iran with an annual 3 million pilgrims have significant direct and indirect effects on the watershed leading to the city and surrounding over the past four decades. there is no collection system and sanitation disposal network in towns and villages within the torghabeh river.  meth...

background : dental unit waterlines (duwls) are ideal nvironment for development of microbial biofilms. microbial contamination of water in duwls is thought to be the result of biofilm formation as it could serves as a haven for pathogens. the aim of this study was to assess microbial quality of water in dental unit waterlines of dental units located at the dental school of isfahan university o...

abstract the results of an integrated study aimed at restoring water quality in a large watershed including seven catchments in north east iran are presented in this paper. this case study demonstrates how landscape metrics reflect direct or surrogate causes of the land use practices that are the determinants of water quality parameters. water quality factors included ec, ph, cl-1, hco3-1, so4-...

this paper examines the relationship between domestic water sources, demand and associated problems in the context of a rapidly increasing household population in nassarawa eggon town, nasarawa state, nigeria. the data for this research were generated using a questionnaire survey of systematically selected households, and analysed using descriptive statistics in the form of frequencies and perc...

background the chemical and physical quality of water used for dialysis fluid is a vital factor in the patients overall care who receive dialysis. therefore, the water used for this purpose must be treated with advanced methods before being used for dialysis. conclusions the evaluation of hemodialysis water quality showed that these hospitals were not significantly polluted and the water qualit...

water quality is a most important factor in areas facing water crisis the survival of which is based upon it. in a determination of water value the factors that should be attended to are: the given volume, specified quality(preservation value), as well as the specific time and place.valuation of water in iran is dependent on types of exploited water resources which include: human consumption(qu...