Ship:Flooding

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{{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.]]
{{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 30% in addition to the damage-over-time effect.}}

__TOC__ <!-- __NOEDITSECTION__ -->

== Causing Flooding ==

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

* Being struck by an enemy [[Torpedoes (WoWS)|torpedo]].
* Being [[ship:Ramming|rammed]] by an enemy ship.
* Being hit by a depth charge as a submarine.
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 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. In the case of submarines, only one active flood is possible, in the amidship section.

==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 and submarines — 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 and submarines 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}}.)

=== Base chance ===

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

<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>
Where: 
::* 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> - '''0.07''' if the defending commander has the [[Ship:List_of_Commander_Skills#B_Vigilance|''Vigilance'']] 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:{{#var:expand}}; overflow:auto;"><div>
{{Ship:Torpedo Data}}
</div></div></div>

<div class="b-popup"><div class="b-popup_head js-tech-nav_head"><div><h3>Aerial Torpedo Data</h3></div><span class="b-tech-nav_arrow"></span></div><div class="b-popup_content" style="display:{{#var:expand}}; overflow:auto;"><div>
{{Ship:Aerial Torpedo Data}}
</div></div></div>
<!--
{{#block:i|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:

'''( 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:

'''( 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:

'''( 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 (only one with submarines). 

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; ''[[Admiral Graf Spee]]'' takes 0.375% hit points of damage per second per flood; and submarines take 0.33% 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. There are also blinking red lights on its superstructure.

=== 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.

=== Flooding Duration === 

Flooding has a base duration of '''30 seconds''' for carriers and submarines 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 [[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%.  

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

{{#block:i|  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'''.}}

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.
<center>
{|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
| 6.38% of base health 
| 12.75% of base health 
|-
| With a -20% modifier 
| 24 seconds
| 6% of base health 
| 12% of base health 
|-
| With both modifiers 
| 20 seconds
| 5.1% of base health 
| 10.2% of base health 
|}


{|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%
| 28.9 seconds
| 14.5% of base health 
|-
| -15%, -20%
| 27.2 seconds
| 13.6% of base health 
|-
| -15%, -15%, -20%
| 23.1 seconds
| 11.6% of base health 
|-
| +30%
| 52 seconds
| 26.0% of base health 
|-
| -15%, +30%
| 44.2 seconds
| 22.1% of base health 
|-
| -20%, +30%
| 41.6 seconds
| 20.8% of base health 
|-
| -15%, -15%, +30%
| 37.6 seconds
| 18.8% of base health 
|-
| -15%, -20%, +30%
| 35.4 seconds
| 17.7% of base health 
|-
| -15%, -15%, -20%, +30%
| 30.1 seconds
| 15.0% of base health 
|}


{|class = "wikitable" style="text-align:center;"
|+ 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 
|-
| 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
| 27.2 seconds
| 13.6% 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 
|-
| 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 
| 27.2 seconds
| 10.2% 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 
| 27.2 seconds
| 6.8% of base health 
|}

{|class = "wikitable" style="text-align:center;"
|+ Single-Flood Impact to Submarines&nbsp;&nbsp; (0.33% 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
| 30 seconds
| 9.9% of base health 
|-
| With a -15% modifier 
| 25.5 seconds
| 8.4% of base health 
|-
| With a -20% modifier 
| 24 seconds
| 7.9% of base health 
|-
| With both modifiers 
| 20.4 seconds
| 6.7% of base health 
|}
</center>

== 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 />


[[Category:World of Warships]]
[[Category:Rules pages]]