نتایج جستجو برای: water productivit

تعداد نتایج: 550740  

2007
Jenny Thorvaldson James Pritchett

Overview Water is an important natural resource that contributes to the Colorado’s economic, cultural and social well-being. But, as recent events have shown, our limited water supply has many competing uses and is undergoing many rapid changes. Water rights are being voluntarily transferred from irrigated agriculture to municipal use, groundwater supplies are diminishing and wells without suff...

Journal: :Ground water 2007
Haipeng Guo Jiu Jimmy Jiao

Land reclamation in coastal areas may have a significant effect on local ground water systems. Steady-state analytic solutions based on Dupuit and Ghyben-Herzberg assumptions are derived to evaluate this effect. Two situations are considered, both with ground water flow resulting from precipitation recharge: the coastal aquifer of an extensive landmass and an island. The results show that after...

2012
Ljiljana Takić Ivana Mladenović-Ranisavljević Milovan Vuković Ilija Mladenović

The Danube is an international river passing partly through Serbia. The protection of the environment and sustainable use of water resources is a primary task that implies constant monitoring of the quality status and evaluation of ecochemical status of the water in the Danube basin. The investigation includes calculation of all-inclusive water quality by the Serbian water quality index (SWQI) ...

Journal: :Journal of environmental monitoring : JEM 2009
Dipankar Chakraborti Swapan Kumar Ghorai Bhaskar Das Arup Pal Bishwajit Nayak Babar Ali Shah

This preliminary study reports for the first time that part of the rural population in the Allahabad district and the urban population in the Suklaganj-Kanpur of Unnao district in the Allahabad-Kanpur track of the upper Ganga plain are drinking and using for agricultural irrigation arsenic contaminated water (maximum arsenic concentrations in drinking water and urine are 707 and 1744 microg L(-...

2013
Justin Stoler John R. Weeks Richard Appiah Otoo

Rapid population growth in developing cities often outpaces improvements to drinking water supplies, and sub-Saharan Africa as a region has the highest percentage of urban population without piped water access, a figure that continues to grow. Accra, Ghana, implements a rationing system to distribute limited piped water resources within the city, and privately-vended sachet water-sealed single-...

Journal: :Pediatrics 2009
Walter J Rogan Michael T Brady

Drinking water for approximately one sixth of US households is obtained from private wells. These wells can become contaminated by pollutant chemicals or pathogenic organisms, leading to significant illness. Although the US Environmental Protection Agency and all states offer guidance for construction, maintenance, and testing of private wells, there is little regulation, and with few exception...

Journal: :Bulletin of environmental contamination and toxicology 1994
Y Miyabara J Suzuki S Suzuki

Urban rivers are polluted with discharge from sewage treatment plants and overflowing sewage caused by rainfall (Nix and Merry, 1990; Shiraris et al., 1987). These waste waters accelerate eutrophication of aquatic environments. Since urban river water is the public water supply source, it is an i~0ortant for public health issue to determine whether or not urban rivers are polluted with fecal ef...

1998
M. B. Parlange A. T. Cahill D. R. Nielsen J. W. Hopmans O. Wendroth

Coupled heat and water transport in soils has enjoyed extensive focus in soil physics and hydrology and yet, until recently, there has never been a satisfactory comparison of water vapor ̄uxes measured in the ®eld with theory. At least two factors have led to this, ®rst, most of the experimental work has been laboratory oriented with steady state boundary conditions imposed and second, there ha...

2017
Stefan Banzhaf Marko Filipovic Jeffrey Lewis Charlotte J Sparrenbom Roland Barthel

Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are found in aquatic systems, flora, and fauna worldwide. These potentially harmful compounds are also frequently detected in Sweden and have already resulted in severe problems for public drinking water supply, i.e., some wells had to be closed due to high PFAS concentrations both in raw water and produced drinking water. Knowledge on PFAS ...

Journal: :Journal of water and health 2010
Karthikeyan Paranthaman Henrietta Harrison

Contamination of drinking water by microbiological and chemical agents can lead to adverse health effects. In England and Wales, the Chemicals Hazards and Poisons Division (CHaPD) of the Health Protection Agency provides expert advice on the consequences to public health of chemical contamination incidents affecting drinking water. In this study, we extracted data from the National Database on ...

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