We propose a modular city-scale digital twin that fuses sensor networks, hydrodynamic and sewer models, traffic and asset layers, and a decision engine to produce:
1. Real-time flood nowcasts and short-term forecasts at street level.
2. Road accessibility scores (open, risky, closed) updated continuously.
3. Service continuity planner that prioritizes routes and resources for hospitals, fire, utilities, and evacuation.
4. Citizen interface for alerts, safe-route guidance, and crowdsourced validation.
