Disaster Management Guide
Rome was not destroyed in a day — but a fire, flood, or plague can destroy your Nova Roma in one. Disasters in Nova Roma are not random punishment; they are predictable challenges that test your city planning. A well-prepared city weathers any crisis with minimal losses. An unprepared one loses half its population and months of progress. This guide covers every disaster type, prevention system, and emergency protocol to keep your city standing no matter what the gods throw at it.
Disaster Types — Know Your Enemy
| Disaster | Cause | Damage | Prevention | Response |
|---|---|---|---|---|
| Fire (Common) | Lightning strikes, building proximity to forges, overcrowded insulae (apartment blocks) | Destroys buildings in 3x3 area if unchecked. Spreads to adjacent structures within 30 seconds. | Stone buildings within 10 tiles of forges. Fire breaks (2-tile gaps between districts). Prefect fire stations staffed 24/7. | Activate Vigiles (fire brigade). Demolish one building in the fire path to create a firebreak. Evacuate citizens within 20 tiles. Douse with water from nearest aqueduct branch. |
| Flood (Seasonal) | Heavy rain in spring, river overflow, aqueduct breach | Submerges low-elevation districts. Destroys crops. Ruins granaries (food spoilage within 1 day). | Build granaries on elevated ground (minimum 2 elevation). Aqueduct overflow channels divert excess water. Levees along river banks. | Close aqueduct sluice gates to stop incoming water. Open overflow channels. Move food to high-ground emergency granary. Flood water recedes in 2-3 in-game days. |
| Plague (Rare) | Overcrowded housing, poor sanitation, trade ships from infected cities | Reduces workforce by 30-50 percent over 7 days. Kills elderly and young citizens first. Spreads through high-density districts. | Bathhouses in every district (sanitation bonus). Hospital with minimum 5 doctors. Quarantine port for incoming ships. Max housing density below 80 percent. | Quarantine affected district (close gates). Activate hospital emergency protocol. Distribute medicine from strategic reserve. Suspend trade until plague clears. Takes 5-10 days to fully resolve. |
| Earthquake (Very Rare) | Random, higher risk in mountainous map regions | Destroys 20-40 percent of buildings randomly. Aqueducts and bridges take priority damage. Fires start from collapsed forges. | Earthquake-resistant construction research (unlocks at Academy Level 3). Avoid building critical infrastructure (aqueducts, granaries) on fault lines visible on map overlay. | Immediate: extinguish fires before they spread (fires from earthquake are the real killer). Then: repair aqueduct (water supply priority). Finally: rebuild housing. Takes 10-20 days to recover fully. |
Fire Control — The Most Common Disaster
Fire is the number one city-killer in Nova Roma. One unchecked fire can cascade through a wooden district in minutes. Prevention is cheap — rebuilding is not.
| Measure | Cost | Effectiveness | Priority |
|---|---|---|---|
| Firebreak Districts | Planning cost only — 2 tile gaps between city districts | Stops 90 percent of fire spread | Must implement before city reaches 500 population |
| Vigiles Stations | 200 Gold, 20 Workers per station, covers 30-tile radius | Responds to fire within 15 seconds | One per district for cities over 1000 population |
| Stone Construction Mandate | 50 percent higher building cost for stone vs wood | Stone buildings reduce fire spread chance by 80 percent | Phase out wood buildings in core districts by mid-game |
Aqueduct-Based Flood Control
Aqueducts are not just for water supply — they are your primary flood control system. A well-designed aqueduct network includes overflow channels, sluice gates, and elevated distribution paths that prevent flood water from pooling in low districts. Key design rules: never build the main aqueduct line at ground level (2 elevation minimum), always include overflow branches that divert to the river downstream of the city, and position sluice gates at every major junction point so individual sections can be closed during emergencies.
FAQ
How often do disasters occur?
Disaster frequency scales with city population and difficulty. On Normal difficulty: fires occur roughly every 2-3 in-game years in small cities and monthly in large cities (5000-plus pop). Floods are seasonal (every spring with 30 percent chance if near a river). Plagues have roughly 5 percent chance per year, increasing with trade activity. Earthquakes are roughly once per 10-15 years on Normal. Hard difficulty roughly doubles all frequencies. You cannot prevent disasters entirely — you can only prepare for them.
What is the most cost-effective disaster prevention investment?
Firebreak planning. It costs nothing to implement (just leave 2-tile gaps between districts) and prevents the most common disaster from cascading. Stone construction for core buildings is second — the higher upfront cost pays for itself after preventing one fire. Hospitals are expensive but necessary before your city hits 2000 population when plague risk becomes significant. Build prevention systems in this order: firebreaks, stone construction for core, bathhouses, hospitals, earthquake-resistant research.
Can I save and reload to avoid bad disaster RNG?
Disaster seeds are determined at the start of each in-game year and saved. Reloading a save from within the same year will not change whether a disaster occurs — only its timing within that year may vary slightly. The intended design is that you cannot save-scum disasters. Build prevention infrastructure early. The only way to "cheat" is to save at year-end and replay the entire year if a catastrophic disaster hits — but that is more work than just building firebreaks.
Last updated: July 3, 2026. Disaster mechanics based on community city management testing and difficulty scaling documentation.