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...

A comparative test was undertaken in order to identify the potential of existing mathematical models, including the rice water quality (RICEWQ) 1.6.4v model, the pesticide concentration in paddy field (PCPF-1) model and the surface water and groundwater (SWAGW) model, for calculating pesticide dissipation and exposure in rice paddies in Europe. Previous versions of RICEWQ and PCPF-1 models had ...

Abstract The paper comprises of an application a multi-faceted physically based two-dimensional (2D) hydrodynamic model to simulate the transport phenomena Loktak Lake, including water quality for which there is consensus that it deteriorating due river discharge from sub-catchments carrying sewage loads, soil sediments and agricultural fertilizers, therefore, has emerged as serious environment...

drinking water has received considerable attention recently. however, misuse and mismanagement have resulted in a rapid and widespread decline in source-water quality and supply. water quality guidelines can be used to identify constituents of concern in water, to determine the levels to which the constituents of water must be treated for drinking purposes. membrane technology for the water cyc...

The high degree of spatial variability in climate conditions, and a lack of meteorological data for East Asia, present challenges to conducting surface water research in the context of the hydrological cycle. In addition, East Asia is facing pressure from both water resource scarcity and water pollution. The consequences of water pollution have attracted public concern in recent years. The low ...