|
Drinking-water Distribution System
A water distribution system is a part of water supply network with components that carry potable water from a centralized treatment plant or wells to consumers to satisfy residential, commercial, industrial and fire fighting requirements. Definitions Water distribution network is the term for the portion of a water distribution system up to the service points of bulk water consumers or demand nodes where many consumers are lumped together. The World Health Organization (WHO) uses the term water transmission system for a network of pipes, generally in a tree-like structure, that is used to convey water from water treatment plants to service reservoirs, and uses the term water distribution system for a network of pipes that generally has a loop structure to supply water from the service reservoirs and balancing reservoirs to consumers. Components A water distribution system consists of pipelines, storage facilities, pumps, and other accessories. Pipelines laid within public rig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diagram Of Water Distribution System
A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since prehistoric times on walls of caves, but became more prevalent during the Enlightenment. Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word ''graph'' is sometimes used as a synonym for diagram. Overview The term "diagram" in its commonly used sense can have a general or specific meaning: * ''visual information device'' : Like the term " illustration", "diagram" is used as a collective term standing for the whole class of technical genres, including graphs, technical drawings and tables. * ''specific kind of visual display'' : This is the genre that shows qualitative data with shapes that are connected by lines, arrows, or other visual links. In science the term is used in both ways. For example, Anderson (1997) stated more generally: "diagrams are pictorial, yet abstract, represe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Head
Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum., 410 pages. See pp. 43–44., 650 pages. See p. 22. It is usually measured as a liquid surface elevation, expressed in units of length, at the entrance (or bottom) of a piezometer. In an aquifer, it can be calculated from the depth to water in a piezometric well (a specialized water well), and given information of the piezometer's elevation and screen depth. Hydraulic head can similarly be measured in a column of water using a standpipe piezometer by measuring the height of the water surface in the tube relative to a common datum. The hydraulic head can be used to determine a ''hydraulic gradient'' between two or more points. "Head" in fluid dynamics In fluid dynamics, ''head'' is a concept that relates the energy in an incompressible fluid to the height of an equivalent static column of that fluid. From Bernoulli's principle, the total energy at a given point in a f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standards Australia
Standards Australia is a standards organisation established in 1922 and is recognised through a Memorandum of Understanding (MoU) with the Australian government as the primary non-government standards development body in Australia. It is a company limited by guarantee. As of 1998, it had 73 members representing groups interested in the development and application of technical standards and related products and services. The MoU recognises Standards Australia as Australia's representative on the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC) and the Pacific Area Standards Congress (PASC). Standards Australia develops internationally aligned Australian standards (AS) and participates in standards-related activities. Standards Australia and Standards New Zealand work together to develop joint standards (AS/NZS). Licensing of the sale of standards In 2003, Standards Australia sold its standards publication business and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Standards Association
is the Japanese industrial standard development organization. JSA promotes standardization and management system in Japan through the following activities: * Development of national standards ( JIS) * Support of international standardization activities related to ISO, IEC * Dissemination of standards * Support of developing human resources in standardization and management system * Conduct of Quality Management and Quality Control Certificate Examination * Promotion of conformity assessment History 1945 December 6 : The Dai Nihon Aerial Technology Association and the Japan Management Association merged to form the Japanese Standards Association (JSA). JSA was authorized to incorporate by the Minister of Trade and Industry (now known as the Minister of Economy, Trade and Industry). Its office was first established at the Patent and Standards Bureau in Chiyoda-ku, Tokyo. 1946 : The first issue of "Industrial Standards and Standardization" was published. 1949 : The first Quality ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umweltbundesamt
The Umweltbundesamt (; UBA, ) is the ''German Environment Agency''. Together with the Bundesamt für Naturschutz, the Bundesamt für kerntechnische Entsorgungssicherheit and the Bundesamt für Strahlenschutz, it operates under the jurisdiction of the Federal Ministry of the Environment, Nature Conservation, and Nuclear Safety The Federal Ministry for the Environment, Nature Conservation, Nuclear Safety and Consumer Protection (german: Bundesministerium für Umwelt, Naturschutz, nukleare Sicherheit und Verbraucherschutz, ), abbreviated BMUV, is a cabinet-level min .... The tasks of the office are primarily “the scientific support of the Federal Government (including the Federal Ministeries for the Environment, Health, Economy and Climate Protection, Education and Research, Transport and Digital Infrastructure), the implementation of environmental laws (e.g. emission rights trade, admission of chemicals, medicinal and pesticides) and the public information on environmenta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Standards Institution
The British Standards Institution (BSI) is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. History BSI was founded as the Engineering Standards Committee in London in 1901.Robert C McWilliam. BSI: The first hundred years. 2001. Thanet Press. London It subsequently extended its standardization work and became the British Engineering Standards Association in 1918, adopting the name British Standards Institution in 1931 after receiving a Royal Charter in 1929. In 1998 a revision of the Charter enabled the organization to diversify and acquire other businesses, and the trading name was changed to BSI Group. The Group now operates in 195 countries. The core business remains standards and standards related services, although the majority of the Group's revenue comes from management systems assessment and certification work. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Committee For Standardization
The European Committee for Standardization (CEN, french: Comité Européen de Normalisation) is a public standards organization whose mission is to foster the economy of the European Single Market and the wider European continent in global trading, the welfare of European citizens and the environment by providing an efficient infrastructure to interested parties for the development, maintenance and distribution of coherent sets of standards and specifications. The CEN was founded in 1961. Its thirty-four national members work together to develop European Standards (ENs) in various sectors to build a European internal market for goods and services and to position Europe in the global economy. CEN is officially recognized as a European standards body by the European Union, European Free Trade Association and the United Kingdom; the other official European standards bodies are the European Committee for Electrotechnical Standardization ( CENELEC) and the European Telecommunic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NSF International
NSF (an initialism for National Sanitation Foundation) is a product testing, inspection, certification organization with headquarters in Ann Arbor, Michigan. NSF also offers consulting and training services worldwide. History NSF International was founded in 1944 from the University of Michigan's School of Public Health as the National Sanitation Foundation (NSF) to standardize sanitation and food safety requirements. The process established to develop NSF International's first standards regarding the sanitation of soda fountain and luncheonette equipment, became the process by which NSF International developed other public health and safety standards. To date, NSF has developed more than 80 public health and safety American National Standards Institute, American National Standards. As NSF expanded services beyond sanitation and into new international markets, the legal name was changed to NSF International in 1990. NSF is an accredited, independent third-party certification ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turbidity
Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality. Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal. These small solid particles cause the liquid to appear turbid. Turbidity (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction. Causes and effects Turbidity in open water may be caused by growth of ph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disinfection By-product
Disinfection by-products (DBPs) result from chemical reactions between organic and inorganic matter in water with chemical treatment agents during the water disinfection process. Chlorination disinfection byproducts Chlorinated disinfection agents such as chlorine and monochloramine are strong oxidizing agents introduced into water in order to destroy pathogenic microbes, to oxidize taste/odor-forming compounds, and to form a disinfectant residual so water can reach the consumer tap safe from microbial contamination. These disinfectants may react with naturally present fulvic and humic acids, amino acids, and other natural organic matter, as well as iodide and bromide ions, to produce a range of DBPs such as the trihalomethanes (THMs), haloacetic acids (HAAs), bromate, and chlorite (which are regulated in the US), and so-called "emerging" DBPs such as halonitromethanes, haloacetonitriles, haloamides, halofuranones, iodo-acids such as iodoacetic acid, iodo-THMs ( iodotri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Backflow Prevention Device
A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water distribution systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened). Reduced pressure in the pipe may allow contaminated water from the soil, from storage, or from other sources to be drawn up into the system. Terminology Backflow means the undesirable reversal of flow of a liquid, gas, or suspended solid into the potable water supply; a backflow preventer is designed to keep this from happening. Points at which a potable water system connects with a non-potable water system are called cross connections. Such connections occur naturally in appliances such as clothes washers and dishwashers, but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biofilm
A biofilm comprises any syntrophic consortium of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances (EPSs). The cells within the biofilm produce the EPS components, which are typically a polymeric conglomeration of extracellular polysaccharides, proteins, lipids and DNA. Because they have three-dimensional structure and represent a community lifestyle for microorganisms, they have been metaphorically described as "cities for microbes". Biofilms may form on living or non-living surfaces and can be prevalent in natural, industrial, and hospital settings. They may constitute a microbiome or be a portion of it. The microbial cells growing in a biofilm are physiologically distinct from planktonic cells of the same organism, which, by contrast, are single cells that may float or swim in a liquid medium. Biofilms c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
