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Flooding

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Learn more about flooding.
The "Flooding" ribbon is awarded for causing flooding to an enemy ship.
239_icon_flooding.png
Flooding in World of Warships is a damage-over-time effect that occurs due to damage taken below the waterline, most commonly from being struck by enemy torpedoes. Ships that are undergoing flooding do not list in-game as they would in real life, but do have their top speed reduced by approximately 30% in addition to the damage-over-time effect.

Causing Flooding

Only two effects have a chance to cause a ship to flood:

  • Being struck by an enemy torpedo.
  • Being rammed by an enemy ship.

It is impossible to cause a flooding on an allied ship.[1]

A ship's torpedo protection is shown in the Port screen under the Survivability tab. If no value is shown, it is zero.

A ribbon is awarded when a flood is caused to an enemy ship. Though captains may be awarded multiple flooding ribbons, it is not possible for a ship to suffer from the effects of more than two floods concurrently: one forward and one aft. This is distinctly different from fires, where a ship can suffer from up to four simultaneous fires that stack their damage-over-time effects together.

Flooding Chance

The probability of a ship flooding depends on:

  • the base flooding chance of the torpedo,
  • the presence and quality of a Torpedo Protection System,
  • where the ship is struck by the torpedo (or rammed by the enemy ship),
  • the presence of upgrades and signals mounted on the ships,
  • the skills possessed by the attacking and defending commanders.

All ships — except destroyers — have torpedo protection for their citadel. As a result, the chance of flooding and damage are reduced even if the ship doesn't have "Torpedo Protection" displayed on the Port screen. Destroyers do not have any torpedo protection, so the torpedo damage reduction bonus of Damage Control System Modification 1 : -5% to the risk of fire. / -3% to the risk of flooding when torpedoes hit the torpedo protection. will not function when the upgrade is mounted on a destroyer. (Yet another argument in favor of Engine Room Protection : -20% to the risk of incapacitation. / -20% to repair time..)

Base chance

Flood chance when striking anywhere but the ship's anti-torpedo belt.

FCB = FCT • SVL • SJWU • KLQ

Where:

  • FCB - Base flooding chance
  • FCT - Torpedo flood chance (from the tables below)
  • SVL  = 1.04 if the attacking ship flies the Victor Lima +1% chance of causing a fire for bombs and shells with a caliber above 160mm / +0.5% chance of causing a fire for bombs and shells with a caliber below 160mm. / +4% chance of causing flooding. signal flag, else 1
  • SJWU = 1.15 if the attacking ship flies the Juliet Whiskey Unaone +15% chance of causing flooding. / +5% to the risk of your ship's magazine detonating. signal flag, else 1
  • KLQ  = 1.30 if the attacking commander has the Liquidator skill, else 1


Against a Torpedo Protection System

Flood chance when striking a ship's anti-torpedo belt

FCTP = FCB • 0.33 • UDCS • (1 - (TP + KTP - KPF))

Where:

  • FCTP - Flooding chance against a ship's Torpedo Protection system
  • FCB - Base flooding chance
  • UDCS - 0.97 if the Damage Control System Modification 1 : -5% to the risk of fire. / -3% to the risk of flooding when torpedoes hit the torpedo protection. upgrade is mounted and the ship is not a destroyer, else 1
  • TP - Damage reduction of the ship's Torpedo Protection system (ship specific; roughly 0-50%)
  • KTP - 0.10 if the defending commander has the Enhanced Anti-Torpedo Protection skill, else 0
  • KPF - 0.10 if the attacking commander has the Proximity Fuse skill, else 0

Ship-Launched Torpedo Data

Aerial Torpedo Data

Flooding Effects

The user interface will display this icon — overlayed with the remaining duration — when a ship is experiencing flooding.

There are two parts of the ship that can flood — the forward half and the aft half. Thus there can be two simultaneous floods.

Aircraft carriers, destroyers, and cruisers take 0.25% hit points of damage per second per flood; battleships and large cruisers[1] take 0.5% hit points of damage per second per flood; and Admiral Graf Spee takes 0.375% hit points of damage per second per flood.

In addition, ships that are flooding have their top speed reduced by 30% at full speed forward, and 60% at reverse.

Controlling and Repairing Flooding

Flooding can be stopped in one of two ways:

  • activating the Damage Control Party When activated, instantly repairs fires, floods, and incapacitations, and prevents more for the duration. consumable,
  • or waiting for the flood duration timer to expire.

All damage sustained by flooding is 100% recoverable by ships that can use the Repair Party While active, restores a percentage of the ship's health points each second. consumable.

Flooding Duration

Flooding has a base duration of 30 seconds for carriers and 40 seconds for the other classes. A full duration flood deals a higher percentage of the total health pool in damage than a full duration fire (2 percentage points more on battleships and large cruisers, 1 more on cruisers and destroyers, 2.5 more on aircraft carriers).

Flooding duration can be reduced several ways:

Each of these effects stacks with the others; however, they are multiplicative rather than cumulative.

For example, if all three effects are stacked, the flooding duration is: 40 seconds x 0.85 x 0.85 x 0.80 = 23.12 seconds.

The below table provides the flood durations and total health loss for the different combinations of the above three effects.

Flooding Impacts to Aircraft Carriers
Modifiers Total Damage Duration
Total damage 7.5% of base health 30 seconds
With one -15% modifier 6.25% of base health 25 seconds
With a -20% modifier 6.0% of base health 24 seconds
With two -15% modifiers 5.25% of base health 21 seconds
With one -15% modifier and a -20% modifier 5.0% of base health 20 seconds
With two -15% modifiers and a -20% modifier 4.25% of base health 17 seconds


Flooding Impacts to Battleships and Large Cruisers[1]
Modifiers Total Damage Duration
Total damage 20.0% of base health 40 seconds
With one -15% modifier 17.0% of base health 34 seconds
With a -20% modifier 16.0% of base health 32 seconds
With two -15% modifiers 14.0% of base health 28 seconds
With one -15% modifier and a -20% modifier 13.5% of base health 27 seconds
With two -15% modifiers and a -20% modifier 11.5% of base health 23 seconds


Flooding Impacts to Admiral Graf Spee
Modifiers Total Damage Duration
Total damage 15.0% of base health 40 seconds
With one -15% modifier 12.75% of base health 34 seconds
With a -20% modifier 12.0% of base health 32 seconds
With two -15% modifiers 10.5% of base health 28 seconds
With one -15% modifier and a -20% modifier 10.125% of base health 27 seconds
With two -15% modifiers and a -20% modifier 8.625% of base health 23 seconds


Flooding Impacts to Cruisers and Destroyers
Modifiers Total Damage Duration
Total damage 10.0% of base health 40 seconds
With one -15% modifier 8.5% of base health 34 seconds
With a -20% modifier 8.0% of base health 32 seconds
With two -15% modifiers 7.0% of base health 28 seconds
With one -15% modifier and a -20% modifier 6.75% of base health 27 seconds
With two -15% modifiers and a -20% modifier 5.75% of base health 23 seconds

Notes

Sources

Updated Mechanics for Flooding News article 12-Feb-2019.

Endnotes

  1. ↑ 1.0 1.1 This group includes Tier VII Toulon, Tier VIII Congress, Cherbourg, Haarlem and Schill, Tier IX Admiral Schröder, Ägir, Alaska, Alaska B, Azuma, AL Azuma, Brest, Carnot, Johan de Witt, Kronshtadt, Michelangelo and Siegfried, and Tier X Defence, Gouden Leeuw, Marseille, Puerto Rico, Sevastopol, Stalingrad, Yoshino and Yoshino B .
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