The diagrams portray the flood problem in a specific UK town and two feasible solutions.
The commercial building locates to the South of River B. Industrial Park and Residential area, which lie in the North of River B, the former situation in the West of River A whilst the latter is to the East. Those buildings are all prone to flooding.
The first solution aims to change the position of 3 constructions moving out of the flooding area. To be precise, a move up toward the South of river B is carried out in the commercial building. Simultaneously, other constructions are moved forward to the South of River B. The main advantage of this plan is to protect the environment, while the drawback is it costs a fortune.
Regarding the second proposal, there would be no building displacement, but two dams are the main element to cope with the flood. One dame place on the North source of River A and one in the West of river B. Despite having a low expenditure for the benefit, this solution will affect the land.
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