Providing Fresh Water To Arid Regions Environmental Sciences Essay

Providing Fresh Water To Arid Regions Environmental Sciences Essay From 1950-2000, there was a huge rise in the demand of the water (Smallwood, 2010). The reason for this massive increase in demand can be due to the massive increase in the worlds population towards the later years of the century. Between the years 1940 to 1960 worlds population was roughly around 2500 millions of people (U.N, 2004). This number increased to 6000 millions of people in year 2000 according to United Nations projections in 2004 (ibid). In order fulfil this huge demand of water different countries in the world started using large scale water management techniques. These techniques were very useful at the beginning however these large scale water management techniques are now considered to be in decline (Smallwood, 2010). The focus is now on the small scale water management techniques, however these small scale techniques such as traditional techniques are sometimes not considered to be sufficient enough (ibid). The arid and semi arid regions are those parts of the where there is very little or no rainfall. These areas are largely in central and south eastern parts of Asia, Africa and some parts of America. Pakistan is a developing country in south eastern region of Asia. Pakistan is a semi arid country with the problem of water management in the country. Therefore as an example of semi arid region this report will focus on the feasibility techniques for managing fresh water in Pakistan. Furthermore, this report will look at the dams as large scale water management technique and water desalination and use of ground water as small scale water management techniques. Pakistan 2.1 Background of water management through the use of large dams in Pakistan As a developing country Pakistans economy is mainly dependent on agriculture. Nearly one quarter of Pakistans GDP is contributed by agriculture sector (Ali, 2004). In order for agricultural sector to flourish Pakistan needs to manage water very carefully. A great amount of water for irrigation comes from 5 main rivers of Pakistan (Ali, 2004). These rivers are Indus, Ravi, Jhelum, Sutlej and river Chenab (ibid). Canal water is generated from these five rivers (ibid). This canal system is the largest canal system in the world (ibid). In addition to this there are 2 main dams build in order to manage water more properly. These dams are Mangla and Tarbela dams. Among these dams there are many other small dams build in order manage water for agriculture and electricity generation purposes. The researchers have however argued that these dams are not sufficient enough for Pakistans power and agriculture needs and there is a need to build more dams in order to manage water more sufficiently. 2.2 Current situation Dams can provide cheap electricity and dams can also help in scenarios of natural disaster. Pakistan is currently facing an electricity shortfall of 3000 to 6000 megawatts (Khan.2010). Furthermore recent floods in Pakistan have destroyed thousands of villages and hundreds of cities. According to United Nations floods in July 2010 has affected more than 20 million people in Pakistan. These floods have not only affected the people but floods have also destroyed the crops, which were the main source of income for the people in Pakistan. The arguments have again taken a rise that a controversial KalaBagh dam should be built and if that dam would have been there this flood would not have affected as much it has affected now. The KalaBagh dam is the largest proposed dam to be built in the northern areas of Pakistan. However due to being controversial the work on this has not been started. 2.3 Kalabagh dam, a controversial proposed large dam Kalabagh Dam Project proposed to be located near Islamabad on Indus River (Alvi et.al.N.D). The proposed dam is a multi-purpose project, it would have a live storage capacity of 6.1 million acre feet (ibid).it will fill the capacity loss in reservoirs, it would make contribute very much to irrigation supplies not only for new projects but provide additional water which was agreed by the provinces under Water Apportionment Accord (WAA) of 1991 (ibid). Furthermore, it would add a large amount of cheap hydropower to the National Grid through its 2400 MW (Ultimate 3600 MW) installed power (ibid). This can solve the energy crises of Pakistan and the electricity shortfall can be finished. However this project is opposed by three provinces of Pakistan. Other than Punjab, Sindh, Baluchistan and Khyber Pakhtunkhuwa all are against the project of Kalabagh dam. According to the Sindhi point of view Kalabagh dam would turn sindh into desert (Alvi et.al.N.D). There would be no additional water to fill Kalabagh reservoir (ibid). However recent floods in Pakistan prove that there are enough surpluses of water. Sea water intrusion in Indus estuary would accentuate (ibid). Building of Kala bagh dam will destroy the mangrove forests, which are already threatened (ibid). KalaBagh dam would affect the fish production and water supplies in the southern areas of Pakistan (ibid). It is feared that historic flooding of Peshawar Valley including Nowshera town would be aggravated in the event of recurrence of 1929 record flood (Alvi et.al.N.D). Drainages of surrounding area of Mardan, Pabbi and Swabi plains would be adversely affected by the reservoir thus creating water logging and salinity (ibid). Operation of Mardan SCARP would be adversely affected (ibid). Fertile land would be submerged (ibid). Large number of people would be displaced (ibid). The claims that are mentioned above are the fears of the provinces and it remains to be seen that these claims do really have any reality behind them.Other than the above controversial reasons the Kalabagh dam is a mega project. In other words the Kalabagh dam is considered to be in the large scale water management technique. As it is argued by the Smallwood (2010) that the world is generally moving from using the large scale water management techniques towards the small scale water management techniques. The reason for this is that large scale water management techniques have many disadvantages. When the water is stored on a large scale there is a high risk of water born diseases (Smallwood.2010). Large dams are the combine resources so it is difficult manage the water as everybody would require more water (ibid). In addition to this, large dams causes large amount of displacements of the people (Ibid). Water desalination and small dams used as small scale fresh water management by other arid or semi arid countries Due to the exploitation of natural sources of water, as the water demand has increased, there is a great stress on alternate sources of fresh water (Fritzman et.al, 2006). The sea water can be used to fulfil the demands of the water (ibid). The water is desalinated through thermal technology (ibid). Through this technology the salt is evaporated from the water to make it able for daily use (ibid). The Middle East areas of the world are the main user of the water desalination technology (ibid). These areas are arid and it has a great demand of fresh water (ibid). In order to fulfil the water demands the thermal water desalination technology is being used (ibid). The arid and semi arid regions of Europe are also using the water desalination technology (ibid). The greatest example is the Spain which has the largest water desalination capacity (ibid). This demand of the desalinated water will grow further with Middle East being the greatest user of this technology (ibid). This is due to the rapid increase in the population of Middle Eastern areas (ibid). The Asia will become the rapid growing market of water desalination as there is large increase in population and conventional water resources are becoming insufficient to fulfil the demand of the water (ibid). The water desalination can fulfil the water demands very easily however the cost of installing the water desalination plants are high. However as compared to large dams the cost of water desalination plant is low, meaning water desalination can provide water very cheaply. Through water desalination the water can only be provided to the areas which are near to the sea (Smallwood, 2010). In order to provide fresh water to the areas which are away from the sea and the areas are arid small scale dams can be built to fulfil the demand of the fresh water. A small scale or micro dam if it is designed properly can provide many benefits to the areas near the dam (Ersado, 2005). The micro dams can provide water for irrigation, water for cattle and might even provide water for fishing purposes (ibid). In the areas where there is scarcity of water, usually in developing countries the micro dams can provide water for domestic purposes (ibid). The micro dams are less expensive as compared to large dams and these dams are less controversial. These dams however have many side effects (Ersado, 2005). The standing water can be the source of malaria (ibid). Moreover the standing water provides a good environment for disease transmission (ibid). Conclusion As it argued by Smallwood (2010) that the world is now moving away from the large scale water management. The developed nations such as U.S.A have stressed upon small scale water management techniques (Smallwood, 2010). The arid areas such as Middle East is using water desalination method in order fulfil the demand of fresh water (Fritzman et.al, 2006). The developing countries can also use their costal line in order to fulfil the demand of fresh water. For example Pakistan has a long costal line starting from south of Sindh till the end of south of Baluchistan. This costal line can be used for water desalination and it can fulfil the demand of fresh water of the southern arid areas of Pakistan. As it already predicted by Fritzman et.al (2006) that the water desalination method would be the fastest growing method of providing fresh water, the developing nations such as Pakistan should consider this method and fulfil its water demands.

Thermal Physics :: essays research papers

Thermal Physics – 340  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Exam #1 Due Monday, February 18th, at the start of class As discussed in class, submission of your solutions to this exam will indicate that you have not communicated with others concerning this exam. You may use reference texts and other information at your disposal. Do all problems separately on clean white standard 8.5† X 11† photocopier paper (no notebook paper or scratch paper). Write on only one side of the paper (I don’t do double sided). Staple the entire solution set in the upper left hand corner (no binders or clips). Don’t turn in pages where you have scratched out or erased excessively, re-write the pages cleanly and neatly. All problems are equally weighted. Assume we are working with â€Å"normal† pressures and temperatures with ideal gases unless noted otherwise. Make sure you list all assumptions that you use (symmetry, isotropy, binomial expansion, etc.). 1. A container has one wall which contains many small holes, and outside the container is vacuum. If the container is filled with He at pressure Po, it is found that after one hour the pressure inside the container is Po/2. The container is now filled with an equal number of He and Ne atoms to a total pressure of Po. (a). Calculate the ratio of the number of Ne to He atoms left in the container after one hour. (b). Would this problem be more difficult if the atoms were initially C and H? Explain from two standpoints, the realistic standpoint and the physics-land standpoint. The latter explanation should invoke the assumptions made in the ideal gas model, the former something you know about chemistry. (c). Explain why such a container might be useful in the case of isotopes, especially a series of such containers set up so that what comes out of the first goes into the second and so on. 2. A He and H atom collide elastically in a head-on collision. (a). If they have the same kinetic energy (KE) to begin with, which one gains KE? Answer this by calculating the amount gained and lost for both, relative to their initial value. (b). Suppose the atoms had the same mass but different kinetic energies? Do not do a detailed calculation here, but instead make a physical argument as to why the â€Å"slower† thus â€Å"cooler† atoms would slow down the faster, hotter atoms. This is one process for the moderation of hot neutrons in a nuclear fission reactor by the water used as its coolant. Thermal Physics :: essays research papers Thermal Physics – 340  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Exam #1 Due Monday, February 18th, at the start of class As discussed in class, submission of your solutions to this exam will indicate that you have not communicated with others concerning this exam. You may use reference texts and other information at your disposal. Do all problems separately on clean white standard 8.5† X 11† photocopier paper (no notebook paper or scratch paper). Write on only one side of the paper (I don’t do double sided). Staple the entire solution set in the upper left hand corner (no binders or clips). Don’t turn in pages where you have scratched out or erased excessively, re-write the pages cleanly and neatly. All problems are equally weighted. Assume we are working with â€Å"normal† pressures and temperatures with ideal gases unless noted otherwise. Make sure you list all assumptions that you use (symmetry, isotropy, binomial expansion, etc.). 1. A container has one wall which contains many small holes, and outside the container is vacuum. If the container is filled with He at pressure Po, it is found that after one hour the pressure inside the container is Po/2. The container is now filled with an equal number of He and Ne atoms to a total pressure of Po. (a). Calculate the ratio of the number of Ne to He atoms left in the container after one hour. (b). Would this problem be more difficult if the atoms were initially C and H? Explain from two standpoints, the realistic standpoint and the physics-land standpoint. The latter explanation should invoke the assumptions made in the ideal gas model, the former something you know about chemistry. (c). Explain why such a container might be useful in the case of isotopes, especially a series of such containers set up so that what comes out of the first goes into the second and so on. 2. A He and H atom collide elastically in a head-on collision. (a). If they have the same kinetic energy (KE) to begin with, which one gains KE? Answer this by calculating the amount gained and lost for both, relative to their initial value. (b). Suppose the atoms had the same mass but different kinetic energies? Do not do a detailed calculation here, but instead make a physical argument as to why the â€Å"slower† thus â€Å"cooler† atoms would slow down the faster, hotter atoms. This is one process for the moderation of hot neutrons in a nuclear fission reactor by the water used as its coolant.

“Blue Remembered Hills” by Dennis Potter Comparison

In this essay I am going to compare my play with two comparatives. The play I performed was a scripted piece called â€Å"Blue Remembered Hills† by Dennis Potter, written in . The other two texts are, â€Å"My Mother said I never should†, by Charlotte Keatley, written in , and â€Å"Blood Brothers† by Willy Russell, written in . My performance was set in 1943, in the West Country, â€Å"in the long summer holiday†. Naturalistic theatre was used, however, although it was about the events of seven children, adults play them all. War, bullying, abuse, aggression and murder are explored within the play. It was aimed at adults, as the issues it broached were in addressed in great depth, and because it was shown through the naivety of children, children would not understand. The play has historical and political context, and the political affairs of the time dictate the dialogue. The period in which it was set is reflected by the constant references to the War and â€Å"the Japs†. The circumstances of the children, as well as historical background can be seen throughout. For example, when ‘Donald' says: â€Å"I be tired out and all, working on those saw mills. I cut me thumb off an all†. â€Å"My Mother said I never should† is about four ‘ordinary' mothers/daughters and is about the social changes of the twentieth century, spanned over four different era's. It is set in a variety of places according to what best represents the era. It is also naturalistic, relating to my performance. It also incorporates the idea of children dealing with adult issues but not understanding, for instance: Rosie Mum's got the curse. (Pause) Maybe we did it! Doris (Pause) What curse? Rosie The curse. Doris Oh. Yes†¦ How d'you know she's got it? Rosie You can tell. Doris How? Rosie Just can. Mum's been cross with me all morning. It's also aimed at adults; adults play children in the production because they also need to play adults in the production as well as children. In this way it was similar to â€Å"Blue Remembered Hills†. â€Å"Blood Brothers† was aimed at a broad audience, adults and children of all classes. It is also naturalistic, but also uses forms such as, narration and song. This detracts from reality but makes it more interesting. And adults play the children featured in the play yet again, linking the three pieces of theatre. It is set in the 50's and 60's, in the city for the first act and the country for the second, so it is of a similar era to the other two pieces. In â€Å"Blue Remembered Hills†, there is no indication what class the children are from, but they are expected to be working class, and perhaps Angela may be slightly wealthier than the others. Similar to this is â€Å"My Mother said I never should† as they are middle/working class too. However, in â€Å"Blood Brothers† the two main characters Mickey and Edward are from two contrasting classes: upper class, and lower class. There is direct conflict between them, though they are naive due to their age yet again, for example, Edward is referred to as â€Å"a friggin' poshy†. It addresses issues such as prejudice, class, money, status, superstition and violence. All three pieces are similar, using adults to play children especially, this is an interesting approach, and allows the playwright to broach more serious issues and adapt them for families or adults. This may detract from reality but naturalistic movements were used, mimicking children helped present the serious issues further.

Italian Words Beginning With the Letter Z

Try out these Italian words beginning with the letter Z, with their English translations: zacchera – splash of mudzaccherone  Ã¢â‚¬â€œ mud-bespattered personzaffare – to stop upzaffata – stenchzafferano – saffronzaffirino – sapphirezagara – orange blossomzaino – knapsackzampa – leg, footzampare – to paw the groundzampillante – gushing, spurtingzampirone – fumigatorzampogna – bagpipezana – basketzangolare – to churnzanna – fang, tuskzanni – clown mask, fool, zanyzanzara – mosquitozappa – hoezappare – to hoezattera – raft, slabzavorro – ballast, dead weightzazzera – mop of hairzecca – mintzecchino – sequinzelante – zealouszelo – zealzenit – zenithzenzero – gingerzeppa – wedgezeppo – packed, crammed, burstingzibaldone – mixture, medleyzelo – zealzerbino – matzibellino – sablezimbellare – to lure, to enticezimbello – decoyzinc are – to coat with zinczinco – zinczio – unclezippolo – pin, pegzitto – silencezizzania – discordzocollaio – clog makerzocollare – to clatter about in clogszodiaco – zodiaczolfo – sulfurzolla – clodzollette – sugar cubezompare – to jump, to leapzona – zone, bandzoologia – zoologyzoppaggine – lameness, shake, ricketyzoppicare – to limpzoticaggine – roughness, boorishnesszoticone – boor, lout, rough personzucca – summer squashzucchero – sugarzuccheroso – sweet, sugaryzucchino – squashzuccone – blockheadzuffa – scuffle, frayzufolare – to whistlezuppa – soupzuppiera – soup tureenzuppo – soaked