Definition of point source
1 : a source of radiation (such as light) that is concentrated at a point and considered as having no spatial extension. 2 : an identifiable confined source (such as a smokestack or wastewater treatment plant) from which a pollutant is discharged or emitted.
Point and Nonpoint Pollution Sources
Pollution originating from a single, identifiable source, such as a discharge pipe from a factory or sewage plant, is called point-source pollution. Pollution that does not originate from a single source, or point, is called nonpoint-source pollution.
A point source is an area or physical place or thing from which something is produced or released. In physics it can be defined as a source of energy including sound or light energy.
Examples of point sources include sewage treatment plants; oil refineries; paper and pulp mills; chemical, automobile, and electronics manufacturers; and factories. Regulated pollutants from point sources include wastes, soils, rocks, chemicals, bacteria, suspended solids, heavy metals, pesticides, and more.
Light bulbs, and the Sun, are often treated as point sources. … Each point on the source can be treated as a point source, so a distributed source is like a collection of point sources, as shown in Figure 23.2.
Under the CWA, a point source is defined as “any discernible, confined and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, or vessel or other floating craft.” The term does not include …
beginning; origin; root; rootage; source.
(c) The non-point sources of water pollution do not have a specific location for the discharge of water pollutants into the water bodies, e.g. run-off from crop fields, logging areas, oil spills through cargo ships, etc.
Nonpoint source pollution is difficult to control because it comes from many different sources and locations. Most nonpoint source pollution occurs as a result of runoff. When rain or melted snow moves over and through the ground, the water absorbs and assimilates any pollutants it comes into contact with.
|Point Source of Light||Extended Source of light|
|It is that source of light which forms only the umbra region on the screen of the shadowed object.||It is that source of light that forms umbra as well as the penumbra region on the screen of the shadowed object.|
Point sources release pollutants from discrete conveyances, such as a discharge pipe, and are regulated by federal and state agencies. The main point source dischargers are factories and sewage treatment plants, which release treated wastewater.
(i) From a point source, the wavefront is diverging spherical wavefront. (ii) From a distant light source, the wavefront is plane wavefront.
Stormwater is classified as a point source when it is regulated through the National Pollution Discharge Elimination System (NPDES) Stormwater Program.
Nonpoint source pollution generally results from land runoff, precipitation, atmospheric deposition, drainage, seepage or hydrologic modification. … As the runoff moves, it picks up and carries away natural and human-made pollutants, finally depositing them into lakes, rivers, wetlands, coastal waters and ground waters.
Point sources replace real antenna elements in order to determine the element spacing, lattice, aperture shape, and number of elements that meet array performance requirements. … Spatial aliasing produces large pattern lobes that steal gain from the main beam and point in directions other than the desired direction.
Nonpoint source pollution is caused by broadly distributed and disconnected sources of pollution. These sources can include rain and snowmelt runoff, spills, leaks, sediment erosion, soils containing fertilizers and pesticides, sewage overflows, croplands, failing septic tanks, and more.
Nonpoint pollution sources are broad, diffuse areas, rather than points, from which pollutants enter bodies of water. Examples include runoff of chemicals and sediments from cropland, livestock feedlots, clear-cut forests, urban streets, parking lots, lawns, and golf courses.
Point source pollution is a single identifiable source of pollutants (Lapworth et al., 2012). For instance, industrial, hospital, and sewage treatment effluents, as well as the septic tank are the main point sources for pharmaceuticals discharged to the water bodies.
Solid state lasers emit their rays from a small region in space – the junction – the region where the semiconductor materials are joined. This will act like a point source, but normally a lens is used to collimate the rays by using a convex lens with a short focal length.
Most sounds or noises we encountered in our daily life are from sources which can be characterized as point or line sources. If a sound source produces spherical spreading of sound in all directions, it is a point source.
Factories and sewage treatment plants are two common types of point sources. Factories, including oil refineries, pulp and paper mills, and chemical, electronics and automobile manufacturers, typically discharge one or more pollutants in their discharged waters (called effluents).
Point source water pollution is largely regulated through the Clean Water Act, which gives the EPA the authority to set limits on the acceptable amount of pollutants that can be discharged into waters of the United States.
the CWA, as a point source that conveys into a navigable body of water pollutants generated or created by other persons,5 as well as a point source that creates or generates the pollutants which it intro- duces into a navigable body of water.
Generally speaking, point source pollution is easier to regulate or control because you know the source of the pollution. The rising problem of industrial and urban waste water discharge to rivers in the US during the mid-1900s sparked the need to regulate point source pollution discharge.
Point source pollution is contamination that comes from a single identified origin or area. Nonpoint source contamination is caused by a variety of unknown factors. Nonpoint source pollution, on the other hand, cannot be connected back to a specific known source.
Sources of pollution
A point source is a pipe or channel, such as those used for discharge from an industrial facility or a city sewerage system. A dispersed (or nonpoint) source is a very broad, unconfined area from which a variety of pollutants enter the water body, such as the runoff from an agricultural area.
water pollution that comes from a known and specific location. pollution that comes from a known and specific location. Nonpoint source pollution is pollution that does not have a specific point of origin. … Point source pollution has a known and specific location.
Examples of Non-point sources? industrial spills, increased run-off, increased sediments in water, animal waste, oil, chemicals,fertilizers.
The best example of nonpoint water contamination is a sewage water source.
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