Final answer:
Dry land access is critical for safety during emergencies, ensuring functional evacuation routes and service delivery, while supporting ecological balance through the preservation of wetlands.
Step-by-step explanation:
The advantage of requiring dry land access for buildings, even if they are protected from flooding, is multifaceted. First and foremost, it ensures the safety of occupants by providing a secure and accessible escape route during flood events or emergencies. Even if buildings are fortified against water damage, roads and infrastructure may be compromised, and having a dry land access guarantees that evacuation and emergency services can operate unimpeded. Moreover, during the recovery phase after a flood, dry land access is essential for repair crews and supply deliveries. Finally, from an environmental standpoint, preserving or creating wetlands as a buffer against storm surges and floods not only enhances natural protection but also ensures the biodiversity and ecological balance of the area, which can be crucial in urban planning near low-elevation or coastal areas.