the map below represents river A, which causes floods in village. As a water level rises; indstrial park, residential area and commercial buildings suffer from it which causes significant losses and discontent among the local population.
For this reason, civil engineers suggested two soltions of the problem of flooding. First, relocation of objects. Objects that located at the north have to be replaced to norther areas, whereas, commercial objects at south would be located souther. Such actions will move the objects towards a narrower riverbed, which will eliminate the risk of flooding. Unfortunately, this solution will require significant expenses due to the high cost of implementation
Second, installing water reservoirs and dams. In the case of floodings, excess volumes of water will flow into reservoirs, thereby preventing the destruction of buildings. Also, comparing with the first solution, second one is relatively much cheaper. However, it may cause affects in landscape, which lead to changes in entire ecosystem.
As a result, two solutions represented by engineers have their own advantages and disadvantages, but, the first solution can guarantee safety to both the population and the landscape, which is why it seems preferable, despite its high cost