Xem 1-20 trên 215 kết quả Surface water
  • In 1972, the Clean Water Act (CWA) delineated the basic structure for regulating discharges of pollutants into waters and for establishing quality standards for surface waters under the authority of EPA [10]. Under the CWA’s National Pollutant Discharge Elimination System program, stormwater permits were required for sediment runoff from construction sites and discharges of pollutants into surface waters [11]. The permitting system requires adoption of technology-based and water quality-based effluent limits [11,12].

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  • Vietnam-Netherlands Mekong Delta Masterplan project: Me Kong delta water resources assessment studies has many contents: description of the mekong delta of Viet Nam, hydrology and surface water resources, water quality, hydrogelogy and groundwater recources, water demand and water balance, issues to be solved.

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  • The objective of this paper is the appraisal of the hydrological, hydrogeological, as well as the chemical and microbiological conditions of the surface water and ground water resources of the two study sites. In order to allocate the two study sites into a regional context an intense research on the conditions of the surrounding area was also matter of the survey

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  • Mekong River, the 11th largest river in the world, is the main water source for irrigation, fishery, and domestic use… In short, the living of the whole population in the Mekong Delta (MD) is depending and will be depended on this resource. The MD of Vietnam is located at the most downstream part of the Mekong river basin. With a population of 17 million inhabitants living in 4 million hectares of land, the MD has great potentials for agricultural production. The MD is the most important agricultural production region for the whole country.

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  • “Just do an Internet search.” “It’s on the Internet.” How often have we said or been told that we could find it on the Internet. This third edition of The Water Encyclopedia: Hydrologic Data and Internet Resources started from a premise that most of the information provided within this publication could be found on the Internet. As our team of contributing authors started reviewing each section within each chapter, it soon became apparent that you cannot always find it on the internet.

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  • The procedures described in these standards are intended for the examination of waters of a wide range of quality, including water suitable for domestic or industrial supplies, surface water, ground water, cooling or circulating water, boiler water, boiler feed water, treated and untreated municipal or industrial wastewater, and saline water. The unity of the fields of water supply, receiving water quality, and wastewater treatment and disposal is recognized by presenting methods of analysis for each constituent in a single section for all types of waters.

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  • Contaminated bottom sediments and their negative impacts on water quality are a major problem in surface waters throughout the United States as well as in many other parts of the world. Even after elimination of the primary contaminant sources, these bottom sediments will be a main source of contaminants for many years to come. In order to determine environmentally-effective and cost-effective remedial actions, the transport and fate of these sediments and associated contaminants must be understood and quantified.

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  • The use of models to provide additional details on contaminant fate and transport has rapidly increased in the past 3 decades. The increasing global recognition of the potential risks associated with surface water or ground water contamination and speciÞc environmental regulations implemented after 1980 have demanded a more accurate understanding of these risks as they relate to human health and the environment.

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  • The use of pesticides in the United States has increased dramatically during the last several decades. Hundreds of different chemicals have been developed for use in agricultural and non-agricultural settings. Concerns about the potential adverse effects of pesticides on the environment and human health have spurred an enormous amount of research into their environmental behavior and fate. Much of this concern has focused on the potential for contamination of the hydrologic system, including surface waters.

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  • As a matter of fact in some countries, mainly in India, groundwater development is much more important than surface water irrigation (Mukherji et al. 2009). While rainfed crops depend only on meteorological conditions, irrigated crops depend both on rain regimes and water supply. The combination of these regimes and the interdependencies between international commodity markets and domestic production create opportunities to ensure that water is allocated to the most valuable ends.

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  • Limitations on the availabilityof water resourcesareamong the greatest challenges facing modern society, despite the fact that roughly 70% of the earth’s surface is covered by water. Human society depends on liquid freshwater resources to meet drinking, sanitation and hy‐ giene, agriculture, and industry needs.Roughly 97% of the earth’s surface and shallow sub‐ surface water is saline and about 2% is frozen in glaciers and polar ice.

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  • discharges before your permit could be granted. We cannot permit new discharges to ground in SPZ1. It is very important that septic tanks and PTPs are kept in good working order by their owners. The system should not cause pollution.

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  • Hydrology is the science that deals with the processes governing the depletion and replenishment of water resources of the earth's land areas. The purpose of this book is to put together recent developments on hydrology and water resources engineering. First section covers surface water modeling and second section deals with groundwater modeling. The aim of this book is to focus attention on the management of surface water and groundwater resources.

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  • Continental shelves are the gently sloping areas of the ocean floor, contiguous to the continent, that extend from the coastline to the shelf-break. The shelf break, which is located around 150–200 meters depth, is the area of the continental margin where there is an abrupt change between the shelf and the steeper continental slope. Primary production in the oceans, i.e. the production of organic compounds from dissolved carbon dioxide and nutrients through photosynthesis, is often associated with upwellings (Botsford et al., 2006).

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  • This paper attempts to examine the changes in surface water environment and community based coastal resources management activities in the Tam Giang Lagoon, Central Vietnam. The results show that the lagoon’s surface water has been polluted. BOD5, COD and nutrient concentration have increased in the lagoon’s surface water environment. It proved that there was a present of organic substances. Due to the globalization of seafood products and changes in lagoon’s water quality by aquaculture development; the local government has...

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  • The Mekong delta (MD), the most downstream part of the Mekong river (See figure 1), is known as the biggest "rice bowl" of Vietnam. The Delta has a population of 17 million inhabitants living in 4 million hectares of land. All the people living in the Delta have to depend totally on the water resources, mainly the surface water, for domestic drinking, crop irrigating, fish-shrimp raising, goods transporating and industrial producing.

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  • Through the studies, we can deduce that most of the industrial discharge carries toxic substances. Due to the presence of high amount of toxic, carcinogen, and teratogen of metals, researchers are highly concerned with its effect on the environment and health of mankind. Rigorous investigations are currently being carried out to study the consequences of the contamination on the surface water, groundwater, and surface land due to industrial discharge.

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  • Environmental problems usually develop from the interactions of people, consumption, and resources. Increasing population, increasing consumption and limited resources exacerbate these problems. One concern that heads the list of critical problems is the availability of clean, fresh, surface water. It is the basis of the existence of human societies and economies. Fresh water is essential for many forms of life, is required by humans for drinking, agriculture, and most industrial processes, and plays a prominent role in our recreational activities....

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  • At Hoa An research station - belonging to Can Tho University - a student dormitory and other research facilities are under construction. The existing ground water supply will not meet the prospective fresh water demands of about 300 people in the nearest future.

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  • Water-quality engineering is a specialty area in environmental engineering that includes the subspecialties of water treatment, wastewater treatment, and water-quality control in natural systems. This textbook is intended to encompass the latter subspecialty, and the content of this book constitutes baseline knowledge expected of water-quality engineers and managers.

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