Flood Damage: Structural, Economic, Environmental, Human

Direct Physical Damage

• Structures: Foundation erosion, wall collapse, mold, contamination (sewage, chemicals).
• Infrastructure: Roads, bridges, utilities, water/wastewater plants.
• Contents: Furniture, electronics, documents, inventory, vehicles.

Human Toll

• Drowning (leading cause), trauma, electrocution.
• Displacement: Temporary/permanent; shelter needs.
• Health: Waterborne disease, vector-borne, mental health (PTSD, anxiety).

Economic Impact

• Repair/replacement costs (billions per major event).
• Business interruption, supply chain breaks.
• Insurance losses, uninsured gaps, premium spikes.
• Property value depression in floodplains.

Environmental Damage

• Erosion, sedimentation, habitat destruction.
• Pollutant mobilization (hazmat, nutrients, pathogens).
• Wetland loss, coastal squeeze.
• Long-term soil degradation (salinity, structure).

Service Disruption

• Power, water, communications, transport, healthcare, education.
• Cascading failures (e.g., pump station loss → sewage backup).

Scale Dependence

Flash floods = high velocity, debris, sudden. Riverine floods = prolonged inundation, widespread. Coastal storm surge = salt + force. All devastating.