《Essay写作—Watershed Resources Essay》由会员分享，可在线阅读，更多相关《Essay写作—Watershed Resources Essay（8页珍藏版）》请在金锄头文库上搜索。
1、 专业留学生论文作业代写网站Essay写作Watershed Resources EssayIntroduction / BackgroundCan we imagine life without water? Water is a very precious and limited vital natural resource. The demand of water for development of agricultural, industrial, urban use and power generation is increasing at very fast rate. Wise
2、 use of these resources should really be the concern of all people, whether they are involved in agricultural production activities or not. By accepting it, we can manage to conserve soil and water effectively, then there will be measurable effect on the development of country.Watershed resources pl
3、ay a significant role in the development of a country depending on the location of a watershed; we can get water for domestic, agriculture and industrial uses. It is for this purpose, proper evolution and management of water resources acquires significant importance. Detailed survey work is carried
4、out to find points of equal elevation, ridges and valleys. The reduced levels obtained from this survey were plotted to obtain contour plan. Three main valleys, which yield the water, were obtained from contour map.The water from these valleys in rainy season is not conserved and gets wasted, and ad
5、verse effects are seen such as soil erosion and gully formation. Conversely, if we save and utilize this water there will be proper soil conservation and recharging ground water table will be possible. According to the slopes found on contour plan, various soil and water are constructed in our water
6、shed area. Due to several conservations schemes the water, which have been wanted will get conserved and will give benefit to residents of the area.Water is a limited natural vital resource, which is indispensable for the existence of all-living matter, plant, animal and man. Potable water, which wa
7、s once thought to be an infinite natural resource, it would not last longer and become as dearer as are fossil fuels today. Today water covers 7/10th part of the globe surface, fills its atmosphere and lies unfathomed, beneath the crust of the world. Only less than 1% of it is fit and available for
8、use and consumption by mankind. There are serious apprehensions that greater part of earth may go without water in the coming decades. Water tables in several Asian countries like India, Pakistan and Bangladesh have already gone significantly low.The further projections are that by 2025 grater part
9、of India may go without water unless suitable new resources are tapped and available water is conserved. Total water in the world estimated to be 1.5 billion cu.Km. about 95% of this is in the salty seas, of the remaining 5% fresh water, 60M.cu.Km are immobilized as continuously frozen polar ice and
10、 snow, leaving only 1.5M.cu.Km.As fresh liquid water for plants, animals and man. of the 15 M.cu.Km.of fresh water, of which about 1% is surface water and 99% is stored at varying depths. About half of the ground water is stored at depths greater than 1000m. Therefore for all practical purposes 7M.c
11、u.Km.of fresh water is at reasonable depths plus the 150000cu.Km.of surfaces water is the worlds, usable water where, at any, only 15000 cu.Km.of fresh liquid water exists in lakes and streams of the world. Each year 380000 cu.Km. Of fresh water falls on land oceans, and the same amount is evaporate
12、d from the oceans and lands.On an average country like India receives about 120cm of precipitation per year, mostly as rainfall. On the volume basis is 400 M.Ha.m. The fate of precipitation is estimated as, evaporation 18%; surface runoff 29% and soil infiltration 53%. Nothing can be done to reduce
13、this 18% loss by evaporation. However, wise management can reduce 29% of surface runoff. This can be various water conservation techniques. The wisest management of water is to encourage every drop of rainfall to move into the soil at the point where it strikes the earth.When this happens, evaporati
14、on will be at a minimum, there will no erosion and crop production will be at a maximum. Watershed management or protection implies the proper use of all land water resources of a watershed for optimum production with minimum hazard to natural resources. Proper planning is therefore absolutely so as
15、 to obtain as many benefits as possible with minimum expenditure. Planning for water resources development in its wider sense may broadly be defined as through study of pros and cons of various possible ways of harnessing this wonderful natural resource and finally bring down the means and ways of a
16、chieving the best and optimum benefits.The concept of watershed is basic to all hydrologic designs. Since big watersheds are made of many smaller watersheds, it is necessary to define the watershed in terms of a point. This point is usually the location at which the design is being made and is referred to as the watershed outlet. With respect to the outlet, the watershed consists of all land area that sheds water to the outlet during a rain
