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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 District 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 Citizen Citizens in a nearby city.
    • Can fertilize affected tiles, adding Food Food and/or Production Production potential.
    • Building a Dam or the Great Bath along a 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
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 Food 30 15 25
Major Food Food 45 25 30
Production Production 10 30 15
1000 Year Food Food 60 40 45
Production 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.

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!


Related achievements[]

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.

See also[]

Civilization VI Disasters [edit]
Comet Strike1 2DroughtFloodForest Fire1Meteor Shower1Nuclear accidentSolar Flare1 2Storm (Blizzard • Dust Storm • Hurricane • Tornado)Volcanic eruption
1 Requires DLC2 Apocalypse mode only