Flood (Civ6)

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A flood is a natural disaster in Civilization VI: Gathering Storm. There are two types of floods, described below.

River floods[]

These are normal disasters which happen along Rivers with Floodplains, which includes Rivers on all terrain types except Tundra. The level of the water rises, flooding all Floodplains tiles found along the River, and then recedes on the next turn.

Effects:
- Damages or destroys Districts, improvements, and units on the Floodplains tiles near the River. This may also include a City Center, in which case it loses some HP and Defenses (if it has them).
- May kill some Citizens in a nearby city.
- Can fertilize affected tiles, adding Food and/or Production potential.
- A Dam built along the same River will mitigate floods there. Fertilization rates will drop about 50%, but there will be no destruction anymore.

River floods have three levels of severity, starting with Moderate and ending with 1000 Year Flood. The Disaster Intensity setting of the game controls what levels of flooding will occur more often, but climate change can also contribute to their severity.

The Egyptians' civilization ability allows them to receive full fertility from Floods yet suffer no damage from them.

Floods can be summoned by a Soothsayer standing on a Floodplains tile in the Apocalypse game mode.

Flood effects[]

The table below lists the percentage chance of all effects happening at each different severity level.


Severity	Damages
Severity	Improvement	District	Building	Population	Civilians killed	Units	Garrison
Moderate	Pillaged: 100%	0	100%	0	0	0	0
Major	Pillaged: 100%; Destroyed: 50%	50%	100%	15%	15%	30-50 HP	30-50 HP
1000 Year	Pillaged: 100%; Destroyed: 80%	80%	100%	25%	25%	50-70 HP	50-70 HP

It is interesting to note that floods fertilize each type of Floodplains differently; the exact percentages are listed in the table below. Each expresses the chance of a tile to gain +1 of the given yield, and note that a single tile may gain both yields from the same flood!

Severity	Yield type	Plains Floodplains	Grassland Floodplains	Desert Floodplains
Moderate	Food	30	15	25
Major	Food	45	25	30
Major	Production	10	30	15
1000 Year	Food	60	40	45
1000 Year	Production	15	40	25

Since the Antarctic Late Summer Update Floods will lose their fertilization effects after Climate Change Phase IV. They won't start removing yields gained, though.

Coastal floods[]

The second type of floods happen on coastal lowland tiles, and are a direct result of melting ice caps (which in turn is a result of climate change). Coastal flooding will start occurring as climate change progresses to certain phases, and will first affect the 1-meter tiles (that is, the lowest-lying flatlands), then the 2-meter tiles, and finally the 3-meter ones.

Effects:
- Damages Districts, improvements, and units in the affected tiles.
- Flood waters will make the tiles unusable (i.e., impossible for Citizens to work) until a Flood Barrier has been constructed in the city that owns them.

As climate change progresses further, coastal lowland will become Submerged. Submerged tiles are irrecoverable and become permanent Coast tiles; all districts there are lost. The tiles, however, may be worked as normal Coast tiles; they may also receive any applicable improvements (such as an Offshore Wind Farm).

In-game disaster descriptions[]

Type	Severity	Description
Flood	Moderate	Rising waters overflow the banks of the river and spill into the land beyond.
	Major	Surging, murky water rushes over the land around the river during an intense flood.
	1000 Year	The river bursts its banks, and rising water covers the land for miles around. Not for a thousand years has the river flooded to such an extent!

Gallery[]

Related achievements[]

Seahenge

Have Stonehenge become submerged due to Coastal Flooding.

Seahenge is a Bronze Age timber circle that was discovered and named in 1998. Also a reference to the chance in Civ5 for various wonders to be placed underwater, which many found humorous.