Why Some Cities Flood More Than Others

Flooding isn’t just about how much rain falls — it’s about how well a city’s drainage system can handle it. Some places stay dry while others end up underwater. Here’s why:

1. Old vs. New Infrastructure

Many older cities still use combined sewer systems, where stormwater and wastewater share the same pipes. In heavy rain, these systems get overwhelmed fast, leading to backups and flooding. Newer cities or those that have upgraded their drainage infrastructure typically have separate stormwater systems.

2. Geography Matters

Coastal cities, low-lying areas, and places near rivers are naturally more prone to flooding. Without strong levees, pumps or retention basins, water can’t drain fast enough.

3. Green Infrastructure Makes a Difference

Cities that invest in permeable pavement, rain gardens, and retention ponds can absorb more rainwater, reducing runoff. In contrast, urban areas covered in concrete and asphalt force water into storm drains.

4. Climate Change Is Fueling Bigger Storms

Stronger storms and more frequent downpours mean drainage systems are facing more pressure than ever. Cities that don’t adapt with larger pipes, better flood management plans, and green infrastructure will continue to struggle when the rain starts falling.