Dams :: essays research papers

Many people begetalready dikemed a itsy-bitsy stream using sticks andmud by the time they become adults. Humans bemuse utilize dams since early civilization, becausefour-thousand historic period ago they became aw atomic number 18 thatfloods and droughts affected their well-being andso they began to build dams to cherish themselvesfrom these effects.1 The basic principles of damsstill apply today as they did before a dam mustprevent weewee from being passed. Since and so,people have been continuing to build and perfectthese structures, non doing the full glitz oftheir side effects. The hindering effects of dams onhumans and their environment intemperately outweigh thebeneficial ones. The paragraphs below will provethat the construction and straw man of dams alwayshas and will continue to leave devastating effectson the environment around them. Firstly, tounderstand the thesis people must know whatdams atomic number 18. A dam is a barrier built across a watercourse to delay back or control water flow. Damsare classified as either storage, diversion ordetention. As you could probably notice from itsname, storage dams are created to collect or holdwater for periods of time when there is a surplussupply. The water is then used when there is alack of supply. For example many small damsimpound water in the spring, for use in the summer teetotal months. Storage dams also supply a watersupply, or an modify habitat for fish and wildlifethey may store water for hydroelectricity as well.2A diversion dam is a generation of a commonlyconstructed dam which is built to provide sufficientwater pressure for pushing water into ditches,canals or other systems. These dams, which arenormally shorter than storage dams are used forirrigation developments and for diversion the ofwater from a stream to a reservoir. Diversiondams are mainly built to lessen the effects of floodsand to trap sediment.3 Overflow dams aredesigned to carry water which flow over thiercrests, b ecause of this they must be made ofmaterials which do not erode. Non- overflowdams are built not to be overtopped, and they mayinclude earth or rock in their body. Often, twotypes of these dams are combined to form acomposite structure consisting of for example anoverflow concrete gravity dam, the water thatoverflows into dikes of earthfill construction.4 Adams aboriginal function is to trap water forirrigation. Dams help to decrease the severity ofdroughts, plus unsophisticated production, andcreate new lands for agricultural use. Farmland,however, has its price river bottomlands flooded,defacing the fertility of the soil. This agriculturalland may also result in a neediness of natural artifacts.Recently in Tasmania where has been pressure