Concept: Floods are controlled by preventing poor settlement planning that blocks natural water flow.Explanation:Floods in communities often occur due to unplanned development, such as building on watercourses and lacking proper drainage systems.A planned layout ensures roads, drainage channels, and buildings are properly arranged to allow free flow of rainwater.Harvesting rainwater, tarring roads, or constructing boreholes do not directly control flooding in the community.Answer: B. planned layout