Xem 1-20 trên 55 kết quả Water quantity
  • 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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  • This book incorporates selected topics on theory, revision, and practical application models for water supply systems analysis. A water supply system is an interconnected collection of sources, pipes, and hydraulic control elements (e.g., pumps, valves, regulators, tanks) delivering consumers prescribed water quantities at desired pressures and water qualities. Such systems are often described as a graph, with the links representing the pipes, and the nodes defining connections between pipes, hydraulic control elements, consumers, and sources.

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  • "Makeup" water is added to replace. what is lost by ... quantities of makeup water flowing to the ... the switch to ozone treatment, the makeup ...

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  • The steady increase in industrialization, urbanization and enormous population growth are leading to production of huge quantities of wastewaters that may frequently cause environmental hazards. Raw or treated waste water is very oft en discharged to freshwaters and results in changing ecological performance and biological diversity of these systems. About 70% of water supplied ends up as wastewater and several natural water reservoirs are being contaminated by untreated sewage/industrial effl uents. This makes waste water treatment and waste water reduction very important issues....

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  • Before any water or wastewater can be treated, it must first be characterized. Thus, characterization needs to be addressed. Waters and wastewaters may be characterized according to their quantities and according to their constituent physical, chemical, and microbiological characteristics. Therefore, Part I is composed of two chapters: “Quantity of Water and Wastewater,” and “Constituents of Water and Wastewater.”

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  • (USGS) is to assess the quantity and quality of the natural resources of the Nation and to provide information that will assist resource managers and policymakers at Federal, State, and local levels in making sound decisions. Assessment of water-quality conditions and trends is an important part of this overall mission. One of the greatest challenges faced by waterresources scientists is acquiring reliable information that will guide the use and protection of the Nation’s water resources.

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  • The large amount of water required for the production of plant substance is taken from the soil by the roots. Leaves and stems do not absorb appreciable quantities of water. The scanty rainfall of dry-farm districts or the more abundant precipitation of humid regions must, therefore, be made to enter the soil in such a manner as to be readily available as soil-moisture to the roots at the right periods of plant growth. In humid countries, the rain that falls during the growing season is looked upon, and very properly, as the really effective factor in the production of large...

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  • Wastes are very process-specific but the key pollutants can be derived from knowledge of: the process, construction materials, corrosion / erosion mechanisms and maintenance materials. Waste audits are used to gather information on the source, composition, quantity and variability of all wastes. Waste prevention typically involves preventing the arising of waste at source, minimising the arisings and recycling any waste that is generated.

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  • Science seeks to understand and explain our world, be that its physical composition (geology), chemical composition (chemistry), the way its composite matter interacts (physics), or the organisms that inhabit it (biology). We can only get an idea of what life is all about by piecing together information from each discipline to give us the big picture. We don’t have to look very far to realize that it is difficult, if not impossible, to separate biology from chemistry. After all, our body is a bag of chemicals.

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  • Soil is a biogeochemically dynamic natural resource that supports all critical components that comprise terrestrial ecosystems. It has been called Earth’s living skin. On its June 11, 2004, cover, Science declared soils to be “the final frontier.” The growing awareness that soil provides a variety of ecosystem services beyond food production has attracted interest in soil from nonsoil scientists.

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  • Trước khi bất kỳ nước hoặc nước thải có thể được điều trị, đầu tiên nó phải được đặc trưng. Như vậy, đặc tính cần phải được giải quyết. Waters và nước thải có thể được mô tả theo số lượng và theo đặc điểm vật lý, hóa học và vi sinh vật thành phần của họ. Vì vậy, phần I bao gồm hai chương: "Số lượng của nước và Xử lý nước thải", và "Thành phần của nước và nước thải."...

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  • Kanchha’s father immediately found a job in a brick kiln factory not very far from the city. These kilns produce highly concentrated amounts of fine particulate matter, which interact with other industrial and vehicle fumes over Kathmandu. Brick kilns use coal as their main fuel source, and this contributes to the air pollution in Kathmandu by pumping considerable quantities of sulfur dioxide (SO2) and other toxic substances into the atmosphere. After a few months, Kanchha’s father started to cough.

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  • The recommendations and principles from Agenda 21 cover water resources management in general, i.e. including availability of water, demand regulation, supply and tariffs, whereas water pollution control should be considered as a subset of water resources management. Water resources management entails two closely related elements, that is the maintenance and development of adequate quantities of water of adequate quality (see Case Study V, South Africa). Thus, water resources management cannot be conducted properly without paying due attention to water quality aspects.

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  • The DSS will enable examination of existing conditions, forecasting of future conditions, and simulation of alternatives that will be ecologically sustaining and socially desired. The DSS will address watershed, water quality, water quantity, groundwater and ecosystem restoration needs at the small watershed, major watershed, tributary river, and main stem Minnesota River reach levels of spatial scale. The DSS will enable forecasting future conditions.

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  • A further example of process redesign for manufacturability is Boeing’s Point of Use system for chemical materials. This enables the storage of materials where the production process utilizes them, as opposed to the previous system which utilized centralized chemical disbursement centers that entailed frequent machinist travel over substantial distances and greater overall chemical usage and waste. Generally, point of use efforts enable the storage of materials where the production process utilizes them.

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  • Hydraulic fracturing is an industrial process used to extract fossil fuel reserves that lie deep underground. With the introduction of horizontal drilling, new commercial sources of energy have become available. Wells are drilled and injected with large quantities of water mixed with specially selected chemicals at high pressures that allow petroleum reserves to flow to the surface. While the increased economic activities and the outputs of domestic energy are welcomed, there is growing concern over negative environmental impacts from horizontal drilling in shale formations.

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  • A decision support system (DSS) will be developed, using the results of the MRB model system and other existing watershed DSSs to enable decision-making about investments in watershed management, aquatic ecosystem restoration, water quality, water quantity, and groundwater management measures in the MRB. The DSS will be explicitly designed to meet sponsor needs. The DSS will be linked to the Basin GIS to enable visualization of the spatial arrangement of management measures.

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  • Improving water security can be achieved through increasing water supply, reducing water demand, as well as addressing water quantity and water quality issues related to broader water resource management. Current OECD work on water security is examining how best to manage risks and tradeoffs in the allocation of scarce water resources, in the allocation of pollution loads and in mitigating and preventing droughts and floods.

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  • . Base on Climate Change Scenarios (A2, B2, B1), simulation outputs of river flow show the changes of water resources in Ca River. These results are arguments for water resources planning in Ca River under the climate change situations. Keywords: climate change, water resources, Ca River. 1. Introduction∗ Climate change (CC) is a major concern of society in general and Vietnam in particular. Due to impacts of climate change, water resources in river is changed in quantity, quality, regime ...

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  • It is also interesting to note that these studies took a broad, regional approach to water quality problems and acknowledged the role of not just industrial sources, but nonpoint sources as well. In this respect, the work was particularly far-sighted. Unfortunately, the institutions necessary to implement regional approaches did not exist at that time. 13 Current water quality regulation, as exemplified by the TMDL program, is returning to watershed-level, multi-source analysis of water quality impairments.

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