Uploaded on 2019-08-19 by Niloufar Amiri

There are some stocks and flows such as food,people, energy, water and... in my country. In recent years with the growth of technology, especially in capital city like Tehran, we have seen high levels of immigration which they are because of the shortage of some resources in country side (as can be seen in the photo I took of outside the city) or people may immigrate to continue their education in highly ranked universities witch usually located in capital of cities. so people as flows in cities make different changes on them gradually. Plus, tourist are also effective in changing the context of cities. Moreover, water is known as stock in cities, but it also may causes some changes gradually.For example, last year, heavy rains in rivers of "Isfahan" cause flooded and destroyed many of the river banks.Conversely, years ago, weather conditions dried up large parts of Lake "Urmia", with many endangered species. As a consequence, Spatial Network Model and planning cause better understand flow patterns will allowing to have better frame a strategy to tackle different challenges or information and models may help prevent problems.