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Flooding is the most common environmental hazard worldwide. This is due to the vast geographical distribution of river floodplains and low-lying coastal areas. Flood can be described as an overflow of water. Floods can have a monumental affect on people's lives if they are involved in such a natural disaster. As well can have devastating economic, environmental and health effects that all contribute to drastic changes in quality of life. Floods have wiped out entire cities and devastated many miles of land. This is sometimes completely irreparable; leaving land where cities once stood barren forever. The people that once lived there, if in fact they have even survived the flood, are thus homeless and without most of their possessions. Many may have lost family members or friends to the floods, so have to deal with the traumatic emotional consequences, as well as trying to find somewhere to live. When floods hit less developed countries and areas it has an even greater effect. This is due to a lack of flood defences which more developed countries usually have in place. Also the buildings in less developed countries are often built poorly and so are completely destroyed by the flood water. Most people in less developed areas will not have insurance for their home or possessions and so once destroyed, they are left with nothing. They literally have to start from scratch or seek some aid from charities. How are floods caused by humans? How do man-made changes in a river basin affect floods? The rapid urbanization of cities has led to more concrete surfaces that seal the surface and do not allow water to seep in. A debate around the world is that nature is to blame for natural hazards while one section says that man causes or triggers these hazards by deforestation and pollution. The recent flooding brought a challenge to the idea of flood management, however, since many of the affected communities feel that their susceptibility has increased as a result of policies and decisions pertaining to the management of floodwaters across catchment systems The chaos looks the same everywhere, there is no more identity of space. It becomes the main problem when natural desasters play the main rule in composing the urbanism. The interesting urbanism which is dedicated to this discussion is the city in the Central Serbia, Obrenovac, which played the most critical spot in the floods that befalled region of Balcan in May 2014. As the city is situated on three rivers: Sava, Kolubara and Tamnava, focal point will be not only how to change urbanism of this town, but also how the social and economical problems can play the rule in solving the problem of this town in the future. The study that need to be investigated is the placement of fast-growth borders when needs of people play the most important rule, explained in natural disasters. Serbia get slammed by the worst flooding in its history. The catastrophe started with unprecedented rainfall. Several months, worth of precipitation fell within just two days, swelling major rivers and bursting their banks. The rising waters quickly swallowed whole communities, washed away bridges, and triggered hundreds of landslides, causing horrifying amount of destruction.