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Flooding

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Revision as of 02:53, 21 August 2018
Flood formula corrected.
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Revision as of 18:32, 12 February 2021
Causing Flooding‎
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?__NOTOC____NOEDITSECTION__+{{Video|SCHNDox0BRM|width=375|Learn more about flooding. 16 May 2019}}
 [[File:418_ribbon_flood.png|right|thumb|The "Flooding" ribbon is awarded for causing flooding to an enemy ship.]] [[File:418_ribbon_flood.png|right|thumb|The "Flooding" ribbon is awarded for causing flooding to an enemy ship.]]
 {{AnnoWiki|content= {{AnnoWiki|content=
?[[File:239_icon_flooding.png|left]]'''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 20% in addition to the damage-over-time effect.}}+[[File:239_icon_flooding.png|left]]'''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==+__TOC__ <!-- __NOEDITSECTION__ -->
 + 
 +== Causing Flooding ==
  
 Only two effects have a chance to cause a ship to flood: Only two effects have a chance to cause a ship to flood:
  
?* Being struck by a enemy [[Torpedoes (WoWS)|torpedo]].+* Being struck by an enemy [[Torpedoes (WoWS)|torpedo]].
 * Being [[ship:Ramming|rammed]] by an enemy ship. * Being [[ship:Ramming|rammed]] by an enemy ship.
  
?[[File:Torpedo_protection.png|thumb|A ship's torpedo protection is shown in the Port screen under the Survivability tab. If no value is shown, it is considered to be zero.]]+It is impossible to cause a flooding on an allied ship.<ref>[https://worldofwarships.eu/en/news/game-updates/update-076-night-battle/#misc Update 0.7.6.]</ref> Underwater shell hits can cause damage but do not cause flooding.
?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 multiple floods; either a ship is flooding or it is not. This is distinctly different from [[Ship:Fire|fires]], where a ship can suffer from multiple simultaneous fires that stack their damage-over-time effects together.+ 
 +A ship is immune from flooding during the action time of its {{Damage Control Party}}.
 + 
 +[[File:Torpedo_protection.png|thumb|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.
  
 ==Flooding Chance== ==Flooding Chance==
?  
?The probability of a ship flooding depends on where it is struck by the torpedo (or rammed by the enemy ship), the presence of [[Ship:Upgrades|upgrades]] on the damaged ship (specifically, Damage Control System Modification 1), and the [[Ship:Flags#Signals|signals]] mounted on the attacking ship: Juliet Whiskey Unaone ({{Juliet Whiskey Unaone|Size=18px}}) increases the chance of causing a flood by 15%; Victor Lima ({{Victor Lima|Size=18px}}) increases it by 4%. All the ships except Destroyers have torpedo protection for their citadel. Thanks to this, The chance of flooding and damage are reduced even if the ships don't have "Torpedo Protection" in the port UI. The value in the port is calculated by multiplying flood coefficient by 3. 
?Because destroyers' citadel receive 33% of listed damage from a penetration by default, they ignore the torpedo protection not to reduce torpedo damage too much. 
  
?In order to calculate the flood chance of a given torpedo versus a given ship, the following formula is utilized:+Ramming causes flooding in the impacted section if the ram causes 10% or more damage to the ship.
  
?{{AnnoWiki|content=''' ( [Torpedo Protection Coefficient] x [Damage Control Modification 1] ) x ( [Torpedo Flood Chance] + [Signals] ) = Flood Chance'''}}+The probability of a ship flooding from a torpedo strike depends on:
 +:* the base flooding chance of the torpedo,
 +:* the presence and quality of a Torpedo Protection System,
 +:* where the ship is struck,
 +:* the presence of upgrades and signals mounted on the ships,
 +:* the skills possessed by the attacking and defending commanders.
  
?* The value of "Torpedo Protection" varies by ship and is displayed in the port screen. +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}} will not function when the upgrade is mounted on a destroyer. (Yet another argument in favor of {{Engine Room Protection}}.)
?* The value of "Damage Control Modification 1" is 0.97 if the appropriate [[Ship:Upgrades#Tier_III.2B_Equipment_.28Slot_4.29|upgrade]] is installed; otherwise, it is 1.+
?* "Torpedo Flood Chance" and "Flood Protection Coefficient"; the values can be found in the tables below.+
?* "Signals" varies depending on which signals are equipped; both Victor Lima ({{Victor Lima|Size=18px}}) and Juliet Whiskey Unaone ({{Juliet Whiskey Unaone|Size=18px}}) can increase the flooding chance of torpedoes.+
  
?It is noteworthy that this formula is dependent upon the torpedo striking the torpedo protection (torpedo bulges) on the ship in question. If the torpedo strikes farther forward or astern of this protection, the damage and flood chance reduction afforded by the torpedo protection will not apply.+=== Base chance ===
 +Flood chance when striking anywhere but the ship's anti-torpedo belt.
  
?<div class="b-popup"><div class="b-popup_head js-tech-nav_head"><div><h3>Flood Protection Coefficient</h3></div><span class="b-tech-nav_arrow"></span></div><div class="b-popup_content" style="display:none;"><div>+<center>'''<span style="font-size:110%;">FC<sub>B</sub> = FC<sub>T</sub> &bull; S<sub>VL</sub> &bull; S<sub>JWU</sub> &bull; K<sub>LQ</sub></span>'''</center>
?{{Ship:Flood_Coefficient}}+Where:
?</div></div></div>+::* FC<sub>B</sub> - Base flooding chance
 +::* FC<sub>T</sub> - Torpedo flood chance (from the tables below)
 +::* S<sub>VL</sub>&nbsp; = '''1.04''' if the attacking ship flies the Victor Lima {{Victor Lima|Size=18px}} signal flag, else 1
 +::* S<sub>JWU</sub> = '''1.15''' if the attacking ship flies the Juliet Whiskey Unaone {{Juliet Whiskey Unaone|Size=18px}} signal flag, else 1
 +::* K<sub>LQ</sub>&nbsp; = '''1.30''' if the attacking commander has the [[Ship:List_of_Commander_Skills#D_Liquidator|''Liquidator'']] skill, else 1
 +<br />
 + 
 +=== Against a Torpedo Protection System ===
 + 
 +Flood chance when striking a ship's anti-torpedo belt
 + 
 +<center>'''<span style="font-size:110%;">FC<sub>TP</sub> = FC<sub>B</sub> &bull; 0.33 &bull; U<sub>DCS</sub> &bull; (1 - (TP + K<sub>TP</sub> - K<sub>PF</sub>))</span>'''
 +</center>
 +Where:
 +::* FC<sub>TP</sub> - Flooding chance against a ship's Torpedo Protection system
 +::* FC<sub>B</sub> - Base flooding chance
 +::* U<sub>DCS</sub> - '''0.97''' if the {{Damage Control System Modification 1}} 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%)
 +::* K<sub>TP</sub> - '''0.10''' if the defending commander has the [[Ship:List_of_Commander_Skills#B_Enhanced Anti-Torpedo Protection|''Enhanced Anti-Torpedo Protection'']] skill, else 0
 +::* K<sub>PF</sub> - '''0.10''' if the attacking commander has the [[Ship:List_of_Commander_Skills#A_Proximity Fuze|''Proximity Fuze'']] skill, else 0
  
 <div class="b-popup"><div class="b-popup_head js-tech-nav_head"><div><h3>Ship-Launched Torpedo Data</h3></div><span class="b-tech-nav_arrow"></span></div><div class="b-popup_content" style="display:none;"><div> <div class="b-popup"><div class="b-popup_head js-tech-nav_head"><div><h3>Ship-Launched Torpedo Data</h3></div><span class="b-tech-nav_arrow"></span></div><div class="b-popup_content" style="display:none;"><div>
Line 41:Line 66:
 {{Ship:Aerial Torpedo Data}} {{Ship:Aerial Torpedo Data}}
 </div></div></div> </div></div></div>
 +<!--
 +{{block|i|content=As an example, we can compare the flood chance of a Type 93 mod. 3 torpedo from ''[[Shimakaze]]'' against ''[[Yamato]]''’s vaunted torpedo protection. The ''Yamato'' has Damage Control System Modification 1 installed. The ''Shimakaze'' commander is flying both the Victor Lima ({{Victor Lima|Size=18px}}) and Juliet Whiskey Unaone ({{Juliet Whiskey Unaone|Size=18px}}) signals. The flood chance would be:
  
?{{block|i|content=As an example, we can compare the flood chance of a Type 93 mod. 3 torpedo from ''[[Shimakaze]]'' against ''[[Yamato]]''’s vaunted torpedo protection. The ''Yamato'' has Damage Control Modification 1 installed. The ''Shimakaze'' commander is flying both the Victor Lima ({{Victor Lima|Size=18px}}) and Juliet Whiskey Unaone ({{Juliet Whiskey Unaone|Size=18px}}) signals. The flood chance would be:+'''( 0.15 x 0.97 ) x [ (4.06) + (0.15) + (0.04) ] = 61.84% flood chance'''
  
 +If the ''Shimakaze'' was to de-mount the signal flags, the flood chance would be:
  
?'''{ [ (1.00) - (0.55) - (0.03) ] x 0.33 } x [ (4.06) + (0.15) + (0.04) ] = 58.91% flood chance'''+'''( 0.15 x 0.97 ) x [ 4.06 ] = 59.07% flood chance'''
  
 +If the same ''Shimakaze'' was to attack a ''[[Montana]]'' that did not have Damage Control System Modification 1 installed, the flood chance would be:
  
?If the ''Shimakaze'' was to de-mount the signal flags, the flood chance would be:+'''( 0.21 x 1 ) x [ 4.06 ] = 85.26% flood chance'''
 +}} -->
  
 +== Flooding Effects ==
 +[[File:Затопление_значок.jpg|thumb|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 &mdash; the forward half and the aft half. Thus there can be two simultaneous floods.
  
?'''{ [ (1.00) - (0.55) - (0.03) ] x 0.33 } x [ 4.06 ] = 56.27% flood chance'''+Aircraft carriers, destroyers, and cruisers take 0.25% hit points of damage per second per flood; battleships and large cruisers<ref name="large" /> 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.
  
?If the same ''Shimakaze'' was to attack a ''[[Montana]]'' that did not have Damage Control Modification 1 installed, the flood chance would be:+=== Controlling and Repairing Flooding ===
 +Flooding can be stopped in one of two ways:
 +* activating the {{Damage Control Party}} 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}} consumable.
  
?'''{ [ (1.00) - (0.37) ] x 0.33 } x [ 4.06 ] = 84.41% flood chance'''+=== Flooding Duration ===
?}}+
  
?==Flooding Effects==+Flooding has a base duration of '''30 seconds''' for carriers and '''40 seconds''' for the other classes.
  
?[[File:Затопление_значок.jpg|thumb|The user interface will display this icon — overlayed with the remaining duration — when a ship is experiencing flooding.]] +Flooding duration cannot be extended by subsequent strikes on a part of the ship that is already flooding. Otherwise, flooding duration can be altered in several ways:
?Flooding damage reduces a ship's health by '''0.667% of its total health pool per second'''. If a flood is not controlled (see below) and is allowed to run for its full duration, a ship will lose just over '''60%''' of its total health pool to a single flood.+
  
?In addition, ships that are flooding have their top speed reduced by 15-20% (depending on class).+* Activation of the Damage Control Party will stop flooding immediately.
 +* Equipping Slot 4 upgrade [[Ship:Upgrades#Damage_Control_System_Modification.C2.A02|Damage Control System Modification 2]] will reduce the duration by 15%.
 +* A battleship commander's [[Ship:List_of_Commander_Skills#B_Basics_of_Survivability|Basics of Survivability]] skill will reduce the duration by 15%.
 +* In contrast, the [[Ship:List_of_Commander_Skills#B_Super-Heavy_AP_Shells|Super-Heavy AP Shells]] battleship skill will extend the duration by 30%.
 +* Flying the Juliet Yankee Bissotwo {{Juliet Yankee Bissotwo|Size=18px}} signal will reduce the duration by 20%.
  
?==Controlling Flooding==+Each of these effects stacks with the others; however, they are multiplicative rather than additive.
  
?The effects of flooding can only be removed by utilization of the {{Damage Control Party}} consumable, or by waiting for the flood duration timer to expire. Flooding has a base duration of '''90 seconds''', which can be reduced several ways:+{{block|i|content= For example, if Damage Control System Modification 2 and Juliet Yankee Bissotwo are stacked, the flooding duration is:<br /> '''40 seconds x 0.85 x 0.80 = 27.2 seconds'''.}}
  
?* Equipping [[Ship:Upgrades#Tier_VI.2B_Equipment_.28Slot_5.29|Damage Control Modification 2]] will reduce the duration by 15%.+The below tables provides the flood durations and total health loss for the different combinations of the modifiers. Full flood duration uninterrupted by Damage Control Party is assumed.
?* Using a commander with the Level 3 commander skill [[Ship:Commander#List of Endurance Skills|Basics of Survivability]] will reduce the duration by 15%.+<center>
?* Flying the Juliet Yankee Bissotwo [[Ship:Flags#Signals|signal]] ({{Juliet Yankee Bissotwo|Size=18px}}) will reduce the duration by 20%. +{|class = "wikitable" style="text-align:center;"
 +|+ Flooding Impact to Aircraft Carriers&nbsp;&nbsp; (0.25% HP/sec)
 +! style="vertical-align:middle; width:240px" | Modifiers
 +! style="vertical-align:middle; width:150px" | Duration
 +! style="vertical-align:middle; width:175px" | Single Flood
 +! style="vertical-align:middle; width:175px" | Double Flood
 +|-
 +| none
 +| 30 seconds
 +| 7.5% of base health
 +| 15% of base health
 +|-
 +| With a -15% modifier
 +| 25.5 seconds
 +| 6.4% of base health
 +| 12.6% of base health
 +|-
 +| With a -20% modifier
 +| 24 seconds
 +| 6% of base health
 +| 12% of base health
 +|-
 +| With both modifiers
 +| 20 seconds
 +| 5% of base health
 +| 10% of base health
 +|}
  
?Each of these effects stacks with the others; however, they are multiplicative rather than cumulative. 
  
?{{block|i|content= For example, if all three effects are stacked, the flooding duration is: '''90 seconds x 0.85 x 0.85 x 0.80 = 52.02 seconds'''.}}+{|class = "wikitable" style="text-align:center;"
 +|+ Single-Flood Impact to Battleships&nbsp;&nbsp; (0.5% HP/sec)
 +! style="vertical-align:middle; width:240px" | Modifiers
 +! style="vertical-align:middle; width:150px" | Duration
 +! style="vertical-align:middle; width:175px" | Total Damage
 +|-
 +| none
 +| 40 seconds
 +| 20.0% of base health
 +|-
 +| -15%
 +| 34 seconds
 +| 17.0% of base health
 +|-
 +| -20%
 +| 32 seconds
 +| 16.0% of base health
 +|-
 +| -15%, -15%
 +| 28 seconds
 +| 14.0% of base health
 +|-
 +| -15%, -20%
 +| 27 seconds
 +| 13.5% of base health
 +|-
 +| -15%, -15%, -20%
 +| 23 seconds
 +| 11.5% of base health
 +|-
 +|-
 +| +30%
 +| 52 seconds
 +| 26.0% of base health
 +|-
 +| -15%, +30%
 +| 44 seconds
 +| 22.1% of base health
 +|-
 +| -20%, +30%
 +| 42 seconds
 +| 20.8% of base health
 +|-
 +| -15%, -15%, +30%
 +| 36 seconds
 +| 18.2% of base health
 +|-
 +| -15%, -20%, +30%
 +| 34 seconds
 +| 16.9% of base health
 +|-
 +| -15%, -15%, -20%, +30%
 +| 26 seconds
 +| 13.0% of base health
 +|}
 + 
  
?The below table provides the flood durations and total health loss for the different combinations of the above three effects. 
?<center> 
 {|class = "wikitable" style="text-align:center;" {|class = "wikitable" style="text-align:center;"
?! style="vertical-align:middle; width:300px" | Modifiers+|+ Single-Flood Impact to Large Cruisers<ref name="large">This group includes {{LargeCruiserList}}.</ref>&nbsp;&nbsp; (0.5% HP/sec)
 +! style="vertical-align:middle; width:240px" | Modifiers
 +! style="vertical-align:middle; width:150px" | Duration
 ! style="vertical-align:middle; width:175px" | Total Damage  ! style="vertical-align:middle; width:175px" | Total Damage
?! style="vertical-align:middle; width:175px" | Duration 
 |- |-
?| Total damage +| none
?| 60% of base health +| 40 seconds
?| 90 seconds+| 20.0% of base health
 |- |-
?| With one -15% modifier +| With a -15% modifier
?| 51% of base health +| 34 seconds
?| 77 seconds+| 17.0% of base health
 |- |-
 | With a -20% modifier  | With a -20% modifier
?| 48% of base health +| 32 seconds
?| 72 seconds+| 16.0% of base health
 |- |-
?| With two -15% modifiers +| With both modifiers
?| 43.4% of base health +| 27 seconds
?| 65 seconds+| 13.5% of base health
 +|}
 + 
 + 
 +{|class = "wikitable" style="text-align:center;"
 +|+ Single-Flood Impact to ''[[Admiral Graf Spee]]''&nbsp;&nbsp; (0.375% HP/sec)
 +! style="vertical-align:middle; width:240px" | Modifiers
 +! style="vertical-align:middle; width:150px" | Duration
 +! style="vertical-align:middle; width:175px" | Total Damage
 |- |-
?| With one -15% modifier and a -20% modifier +| none
?| 40.8% of base health +| 40 seconds
?| 61 seconds+| 15.0% of base health
 |- |-
?| With two -15% modifiers and a -20% modifier +| With a -15% modifier
?| 34.7% of base health +| 34 seconds
?| 52 seconds+| 12.75% of base health
 +|-
 +| With a -20% modifier
 +| 32 seconds
 +| 12.0% of base health
 +|-
 +| With both modifiers
 +| 27 seconds
 +| 10.125% of base health
 +|}
 + 
 + 
 +{|class = "wikitable" style="text-align:center;"
 +|+ Single-Flood Impact to Cruisers and Destroyers&nbsp;&nbsp; (0.25% HP/sec)
 +! style="vertical-align:middle; width:240px" | Modifiers
 +! style="vertical-align:middle; width:150px" | Duration
 +! style="vertical-align:middle; width:175px" | Total Damage
 +|-
 +| none
 +| 40 seconds
 +| 10.0% of base health
 +|-
 +| With a -15% modifier
 +| 34 seconds
 +| 8.5% of base health
 +|-
 +| With a -20% modifier
 +| 32 seconds
 +| 8.0% of base health
 +|-
 +| With both modifiers
 +| 27 seconds
 +| 6.75% of base health
 |} |}
 </center> </center>
  
?All damage sustained by flooding is 100% recoverable by ships that can use the {{Repair Party}} consumable.+== Notes ==
 +=== Sources ===
 +[https://worldofwarships.com/en/news/game-updates/flooding-and-radar-changes/#flooding Updated Mechanics for Flooding] News article 12-Feb-2019.
 +=== Endnotes ===
 +<references />
 + 
  
?{{#gw_breadcrumbs: Ship}} 
 [[Category:World of Warships]] [[Category:World of Warships]]
 +[[Category:Rules pages]]

Revision as of 18:32, 12 February 2021

(link)

Learn more about flooding. 16 May 2019
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] Underwater shell hits can cause damage but do not cause flooding.

A ship is immune from flooding during the action time of its Damage Control Party When activated, instantly repairs fires, floods, and incapacitations, and prevents more for the duration..

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.

Flooding Chance

Ramming causes flooding in the impacted section if the ram causes 10% or more damage to the ship.

The probability of a ship flooding from a torpedo strike depends on:

  • the base flooding chance of the torpedo,
  • the presence and quality of a Torpedo Protection System,
  • where the ship is struck,
  • 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 Fuze 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.

Flooding duration cannot be extended by subsequent strikes on a part of the ship that is already flooding. Otherwise, flooding duration can be altered in several ways:

  • Activation of the Damage Control Party will stop flooding immediately.
  • Equipping Slot 4 upgrade Damage Control System Modification 2 will reduce the duration by 15%.
  • A battleship commander's Basics of Survivability skill will reduce the duration by 15%.
  • In contrast, the Super-Heavy AP Shells battleship skill will extend the duration by 30%.
  • Flying the Juliet Yankee Bissotwo -20% to flooding duration. signal will reduce the duration by 20%.

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

For example, if Damage Control System Modification 2 and Juliet Yankee Bissotwo are stacked, the flooding duration is:
40 seconds x 0.85 x 0.80 = 27.2 seconds.

The below tables provides the flood durations and total health loss for the different combinations of the modifiers. Full flood duration uninterrupted by Damage Control Party is assumed.

Flooding Impact to Aircraft Carriers   (0.25% HP/sec)
Modifiers Duration Single Flood Double Flood
none 30 seconds 7.5% of base health 15% of base health
With a -15% modifier 25.5 seconds 6.4% of base health 12.6% of base health
With a -20% modifier 24 seconds 6% of base health 12% of base health
With both modifiers 20 seconds 5% of base health 10% of base health


Single-Flood Impact to Battleships   (0.5% HP/sec)
Modifiers Duration Total Damage
none 40 seconds 20.0% of base health
-15% 34 seconds 17.0% of base health
-20% 32 seconds 16.0% of base health
-15%, -15% 28 seconds 14.0% of base health
-15%, -20% 27 seconds 13.5% of base health
-15%, -15%, -20% 23 seconds 11.5% of base health
+30% 52 seconds 26.0% of base health
-15%, +30% 44 seconds 22.1% of base health
-20%, +30% 42 seconds 20.8% of base health
-15%, -15%, +30% 36 seconds 18.2% of base health
-15%, -20%, +30% 34 seconds 16.9% of base health
-15%, -15%, -20%, +30% 26 seconds 13.0% of base health


Single-Flood Impact to Large Cruisers[1]   (0.5% HP/sec)
Modifiers Duration Total Damage
none 40 seconds 20.0% of base health
With a -15% modifier 34 seconds 17.0% of base health
With a -20% modifier 32 seconds 16.0% of base health
With both modifiers 27 seconds 13.5% of base health


Single-Flood Impact to Admiral Graf Spee   (0.375% HP/sec)
Modifiers Duration Total Damage
none 40 seconds 15.0% of base health
With a -15% modifier 34 seconds 12.75% of base health
With a -20% modifier 32 seconds 12.0% of base health
With both modifiers 27 seconds 10.125% of base health


Single-Flood Impact to Cruisers and Destroyers   (0.25% HP/sec)
Modifiers Duration Total Damage
none 40 seconds 10.0% of base health
With a -15% modifier 34 seconds 8.5% of base health
With a -20% modifier 32 seconds 8.0% of base health
With both modifiers 27 seconds 6.75% of base health

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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