for better understanding of tehran ground water, samples were taken randomly from 340 out of 655 deep & semi deep wells in 1993, which dug by tehran water supply and sewage engineering company. 260 water specimens were examined chemically and physically and compared with the 1993 world health organization (who) and food and agriculture organization (fao) criteria and analyzed statistically. log...

background: nitrate and nitrite compounds are considered as groundwater’s contamination factors, which in recent years, their densities have been growing in these resources. this study was conducted aiming to measure nitrate and nitrite density in drinking water wells in villages around the industrial estate, city of orumieh, and to compare them to the approved standards. methods: this was a de...

OBJECTIVE To evaluate the environmental quality of Guiyu, Guangdong impacted by the electronic waste recycling industry. METHODS The surface water, ground water and sediment samples taken separately from two sites that recycle E-wastes and other rubbish relevant to the E-waste recycling, and an agricultural area, were analyzed, and the data were used to evaluate the impact of E-waste recyclin...

Florida’s coastal environment is especially vulnerable to nonpoint source pollution for two reasons. One, the extent of the karst nature of the platform allows great interaction between ground and surface waters. Second, the low gradient of the land results in high water tables. Both of these factors result in poor attenuation of contaminants in the subsurface, and the release of nutrients and ...

Introduction Modern landfills are highly engineered containment systems, designed to minimize the impact of solid waste (refuse, trash, and garbage) on the environment and human health. In modern landfills, the waste is contained by a liner system. The primary purpose of the liner system is to isolate the landfill contents from the environment and, therefore, to protect the soil and ground wate...

Ground-based water vapour soundings by microwave radiometry and Raman lidar on Jungfraujoch (Swiss Alps) D. Gerber, I. Balin, D. Feist, N. Kämpfer, V. Simeonov, B. Calpini , and H. van den Bergh Institute of Applied Physics, University of Bern, Switzerland Laboratory of Air Pollution, Swiss Federal Institute of Technology – Lausanne (EPFL), Lausanne, Switzerland Now at: MétéoSuisse, Payerne Sta...

Main perennial rivers of Gujarat, Tapi, Narmada, Mahi and Sabarmatiare meeting Arabian Sea in Gulf of Khambhat. The out flow of Mahi River intothe sea is decreased due to construction of dams like Bajaj Sagar, Kadana, Panamand Wanakbori weir. So, Tidal effect of sea and sea water intrusion is beingincreased on landward side. Moreover, due to erratic nature of rainfall andimproper management of ...

In the United States an estimated 140,000 Class II wells for salt water disposal and enhanced hydrocarbon recovery are presently injecting some 30 million barrels of brine per day into subsurface formations. While no systematic survey has documented the extent of shallow ground water contamination from these disposal practices, it is recognized as a major potential pollution source in leading h...

Having the ability to identify areas of land that are vulnerable to ground water contamination should facilitate the development of management and regulatory options that may be used on a regional scale. The prevalent approach to modelling land areas has been to identify contamination processes deductively and then construct theoretical models comprised of pertinent variables. Most models for p...

BACKGROUND Ground waters are an important resource of water supply for human health and activities. Groundwater uses and applications are often related to its composition, which is increasingly influenced by human activities.In fact the water quality of groundwater is affected by many factors including precipitation, surface runoff, groundwater flow, and the characteristics of the catchment are...