River flooding (fluvial)
This occurs when a river cannot cope with the amount of water entering it.
Weather and tidal conditions can increase sea levels.
Surface water flooding (pluvial)
This happens when there is heavy rainfall on ground that is already saturated, or on paved areas where drainage is poor.
When rainfall causes the water that is naturally stored underground to rise to the surface it can flood low-lying areas.
Drain and sewer flooding
This can occur during heavy rain when drains have become blocked or full.
Broken water mains flooding
Burst water mains can cause flooding underground and to basements of properties.