Uploaded on 2017-06-12 by eslam Helmy Zekry Abd ElGalil

identify the most important stocks and flows? 1- Stocks and flows of water in the city : There is no city without water. Water decides on the survival of a city, and always did. The regions of the Kingdom of Saudi Arabia are defined as dry desert areas, where water is scarce, especially drinking water and irrigation. Therefore, the Kingdom is directed to the desalination of the sea, and Saudi Arabia is the first country in the world to desalinate seawater followed by the United Arab Emirates. And then after desalinating the water in the coastal areas of large factories then the state works to transfer those water to residential communities, especially the huge ones such as the area where I live. Where the water is connected to it through huge networks of industrial pipes.Water is then stored in huge state-owned tanks or in personal tanks for individuals above and below their homes. 2- Stocks and flows of food in the city : As mentioned above, the Saudi Arabia is located in the dry region, and knows that most of its dry deserts are mentioned in our first example. It also suffers from rare water and is heavily dependent on water desalinated from the sea. It was therefore difficult for them to grow what they needed from agricultural crops within the country. The Kingdom has recently managed to cultivate some sites in the Sahara depending on the groundwater, but not on the size that covers the entire needs of the Kingdom. Therefore, it had to choose the following two methods of planting: The first is the leasing of agricultural lands in some of the towns known for their fertile soil such as Sudan and Argentina. Second is the direct purchase of their food needs. 3-Stock and flows of energy : The Kingdom of Saudi Arabia is known as one of the world's largest oil producing countries. It is also one of the largest exporting countries in the world, and in the form of Sanki the facility shows that the Kingdom produces about 552.9 barrels and exports about 359.8 barrels. Petroleum products and natural gas also have a role as a source of energy. However, if we look at the uses of these sources in their final sites, we find that transport operations consume the largest share of them are mainly dependent on petroleum, while the industry comes in the next rank in the use of petroleum, but consume a share of gas and electricity. All these processes represent multiple movements and flows within the country.