What building restriction applies near a waterway?

When considering building restrictions near a waterway, maintaining a safe buffer zone is crucial to protect both the environment and the structures themselves. The requirement to prohibit buildings within 100 feet of a waterway is commonly enforced to safeguard water quality, protect aquatic habitats, and reduce risks associated with flooding and erosion. This setback distance allows for a natural buffer that can help filter runoff, provide habitat for wildlife, and ensure that development does not disrupt the ecological balance of the area.

Additionally, having this distance helps to mitigate hazards that may arise during extreme weather events, where floodwaters can reach properties closer to the water. It serves as a protective measure that aligns with various environmental regulations and local zoning laws, which may differ but generally converge on the principle of maintaining a safe distance from water bodies.

In contrast, the other options suggest smaller setbacks or guidelines that may not sufficiently address the necessary considerations for environmental protection and safety near waterways, which could lead to detrimental impacts on both the natural landscape and human infrastructure.