What three criteria are necessary to confirm floodproofing of a building?

The criteria for confirming floodproofing of a building focus on the building's ability to withstand flood conditions without sustaining damage. The correct answer includes three essential components: watertight walls, the structure's ability to resist water pressure, and protection of utilities from flooding.

Watertight walls are crucial because they ensure that water cannot penetrate the building, which is fundamental to maintaining the integrity of the interior space during flood events. This characteristic prevents damage to the building’s structure and the possessions inside.

The second component, the ability to resist water pressure, relates to the structural integrity of the building. Floodwater exerts force against walls, and a floodproof building must be designed to withstand that pressure without collapsing or allowing water to enter.

Lastly, ensuring that utilities are protected from flood events is essential for the functionality of the building. If utilities, such as electrical systems, heating, and plumbing, are not adequately protected, they can be severely damaged during flooding, leading to costly repairs and potential hazards.

Together, these criteria create a comprehensive approach to floodproofing, allowing a building to remain functional and safe even in flood conditions.