How long does it take to fill water a room ?


Rules Discussion


Hello,
I have a question how long does it take to fill water a room ?

For example, as a first mean as a decanter of endless water.

Thanks for your future answer.


Depends on the size of the room and the water tightness of said room.

If the room was tiny it would fill much quicker than a banquet hall, if the dnd magic item i just googled equates to 30 gallons per round which is approx 100k cm3 of water and for reference a 10 ft cube of water is just short of 30 million cubic cm so it would take 300 rounds to fit 10 feet cubed assuming no leaks


To clarify for anyone rhe above are very general appoximations , also there are two types of gallons to account for as well and while similar would vary the figures by quite a bit, i would say just to approximate 1 5' square grid of map would fill up 1 foot of water per minute. Assuming 30 gallons per round of water is the rate of filling. If you want more exact figures if you can elaborate om the size of room, confirm thst it is airtight (at least from the bottom and sides), what the items rate of filling is and if it is in gallons whether you wish to use imperial or US gallons


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In 2e, the Decanter of Endless Water's geyser setting produces 15 gallons of water a round. This converts to 150 gallons a minute. (15 gallons/6 seconds=2.5 gallons a second, 2.5 gallons x 60 seconds = 150 gallons per minute) This is about equal to the throughput of a 1.5 inch Firehose (as it depends on the pump and the size of the hose).

A 12x20x8 pool can hold 14000 gallons or so. It will take a 150 gallons a minute an hour and a half or so to fill a pool that large.

So, for any room of meaningful size I'd say an hour at the minimum.


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Waldham wrote:

Hello,

I have a question how long does it take to fill water a room ?

For example, as a first mean as a decanter of endless water.

Thanks for your future answer.

Make something up that fits the plot of the story you want. If this is going to be part of a non-combat challenge, just use some Victory Point system to determine if the challenge is overcome or not.

Otherwise you are going to end up doing complicated math for a couple of hours instead of playing.


No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

Horizon Hunters

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One round of the Gyser function fills about 2 cubic feet with water. a 5x5x5ft cube is 125 cubic feet. Scale up from there, so a 10x10x10ft room, which is just 4 squares, would take 500 rounds, or about 50 minutes, to fill up.

syrath wrote:

No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

Why are you using a D&D item as a reference? The Decanter of Endless Water is an item in 2e and it states it only outputs 15 gallons per round.


Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Roleplaying Game Subscriber

Said decanter is only 320gp. By 11th-level, a single character could potentially afford 10 of them.

Suddenly 50 minutes is only 10.

By 13th-level, you can have 20 decanters filling a 10x10x10 room in 5 minutes.

If 4 characters do this (80 decanters) the room fills up in less time then it takes to activate all of them.

At 18th-level, 320gp is a drop in the bucket, with a single character capable of having 140 such decanters!

And don't think they won't! I've seen an aquatic focused part do exactly this (while spamming spells like control water) before proceeding into a dungeon. I've seen other parties invest in fog-cutting lenses for the whole party before spamming various fog spells. Anything to gain an edge.

Even at 1st-level, a single party member can afford 1,500 pints of oil (which has no bulk). There aren't too many adventuring problems that can't be solved with the creative use of fire. That's how my party cakewalked The Fall of Plaguestone adventure module.

Horizon Hunters

Ravingdork wrote:

Said decanter is only 320gp. By 11th-level, a single character could potentially afford 10 of them.

Suddenly 50 minutes is only 10.

By 13th-level, you can have 20 decanters filling a 10x10x10 room in 5 minutes.

If 4 characters do this (80 decanters) the room fills up in less time then it takes to activate all of them.

At 18th-level, 320gp is a drop in the bucket, with a single character capably of having 140 such decanters!

And don't think they won't! I've seen an aquatic focused part do exactly this (while spamming spells like control water) before proceeding into a dungeon. I've seen other parties invest in fog-cutting lenses for the whole party before spamming various fog spells. Anything to gain an edge.

Even at 1st-level, a single party member can afford 1,500 pints of oil (which has no bulk). There aren't too many adventuring problems that can't be solved with the creative use of fire.

A single character can't activate 10 of them every turn, mainly because they don't have 20 hands, nor 10 actions.


Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Roleplaying Game Subscriber
Cordell Kintner wrote:
A single character can't activate 10 of them every turn, mainly because they don't have 20 hands, nor 10 actions.

Nope, but a coordinated party sure can!


Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Adventure Path, Starfinder Roleplaying Game, Starfinder Society Subscriber

You run your game how you want, but in my game I'd say there probably aren't eighty decanters in all of Golarion, let alone in a single party.


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Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Roleplaying Game Subscriber
Fumarole wrote:
You run your game how you want, but in my game I'd say there probably aren't eighty decanters in all of Golarion, let alone in a single party.

Oh yeah? ;P

Horizon Hunters

I can believe there's thousands of them in existence, since they create endless fresh water. But having your entire party use them just to fill up a room is boring.

Make them into a trap, where dozens of them blast the party while also filling up the room with water.


Cordell Kintner wrote:

One round of the Gyser function fills about 2 cubic feet with water. a 5x5x5ft cube is 125 cubic feet. Scale up from there, so a 10x10x10ft room, which is just 4 squares, would take 500 rounds, or about 50 minutes, to fill up.

syrath wrote:

No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

Why are you using a D&D item as a reference? The Decanter of Endless Water is an item in 2e and it states it only outputs 15 gallons per round.

Sorry i did a quick google search as im not familiar with the item nor did I have the rules to hand.

Horizon Hunters

syrath wrote:
Sorry i did a quick google search as im not familiar with the item nor did I have the rules to hand.

Adding "PF2" on the search would make it the first result.


Cordell Kintner wrote:
syrath wrote:
Sorry i did a quick google search as im not familiar with the item nor did I have the rules to hand.
Adding "PF2" on the search would make it the first result.

Regardless of that it still gives the OP the info to approximate how long it would take to fill a room. Given how little info was originally provided , i didnt think I did too badly, just my google fu was off a bit


syrath wrote:

No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

That is assuming that your room is actually a giant fish tank.

If the room is not water-tight, you will have to account for how quickly the water is also draining out of the room. And how that rate of draining increases as the water pressure rises because of the higher water level.

Now we are talking about advanced calculus and differential equations. Which is going to take an hour or to in order to calculate out correctly.


breithauptclan wrote:
syrath wrote:

No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

That is assuming that your room is actually a giant fish tank.

If the room is not water-tight, you will have to account for how quickly the water is also draining out of the room. And how that rate of draining increases as the water pressure rises because of the higher water level.

Now we are talking about advanced calculus and differential equations. Which is going to take an hour or to in order to calculate out correctly.

Given the OP didnt even mention the size of room I at least provided an answer and if you read the original answer I gave way back at post no 2 of this thread

Depends on the size of the room and the water tightness of said room.

I dont know why im getting flak for.providing a workable answer to the OPs question. I did Chemical(Process) Engineering at university and all the calculations were approximate.

for a start the original water input (in both DND and PF2)lists Gallons so straight off the bat are we talking US gallons (approx 3.8 litres) or imperial (appprox 4.6 litres) so we are already talking about 2 figures that have an increase of approx 20%

Anyway if someone wants to fill in the variables like cubic feet.of the.room, input of volume of water, output of water loss, ill have it.calculated in less than couple of minutes , in this case it isnt rocket science.


breithauptclan wrote:
syrath wrote:

No need for complicated math it would take 2 minutes to fill 1 foot of a 5*5 grid so if you have a room that has 6 squares its 1 foot for 12 minutes ( i did my calculations based on 30 gallons per round which was abased on the dnd version of the item on dnd beyond and it turns out its half that)

So 1 grid its 2 mins per foot of water
2 grid its 4
3 grid its 6
So the relatively simple calculation is 2 * grid * ceiling height in minutes

so a 9 grid room at 9 feet high ceiling is 162 minutes.

Although as a gm id go with speed of plot myself

That is assuming that your room is actually a giant fish tank.

If the room is not water-tight, you will have to account for how quickly the water is also draining out of the room. And how that rate of draining increases as the water pressure rises because of the higher water level.

Now we are talking about advanced calculus and differential equations. Which is going to take an hour or to in order to calculate out correctly.

Given the OP didnt even mention the size of room I at least provided an answer and if you read the original answer I gave way back at post no 2 of this thread

Depends on the size of the room and the water tightness of said room.

I dont know why im getting flak for.providing a workable answer to the OPs question. I did Chemical(Process) Engineering at university and all the calculations were approximate.

for a start the original water input (in both DND and PF2)lists Gallons so straight off the bat are we talking US gallons (approx 3.8 litres) or imperial (appprox 4.6 litres) so we are already talking about 2 figures that have an increase of approx 20%

Anyway if someone wants to fill in the variables like cubic feet.of the.room, input of volume of water, output of water loss, ill have it.calculated in less than couple of minutes , in this case it isnt rocket science.

Grand Lodge

Decanters of water are not a tool to use as a weapon by drowning.

Issues:
1) usage hold in 2 hands means you can’t use 10 per character
2) Where in the room are you to not drown yourself?
3) assuming a 1 cm gap at the bottom of a door (5 feet wide) means water has to drain at 2.5 km an hour or you flood the whole dungeon.
4) The rarity system has been added for a reason by Paizo - to avoid unbalanced situation. RAW it doesn’t disallow 100 items of x but you really have to ask yourself is this reasonable.

This is a nice thought experiment - but expect table variation if you actually try it out in reality.


Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Roleplaying Game Subscriber

Good point about the hands, Thod. Though I would argue that, that's just to get them started. Or do you believe a lantern or torch goes out the moment you stop holding it?

The idea is not so much intended to drown monsters (much too slow) so much as to change the environment.

If you flood a dungeon, the monster's either cope, die, or relocate to or away from the party.

Most dungeons go down and are usually sealed off (so as not to get the adventurers lost in the Darklands). Flooding the entrance from a generally safe location usually works.

Even if you can't flood the whole dungeon, due to drainage or some other factor, getting a foot or two of water in several rooms makes everything difficult terrain and can change how many scenarioswould play out.

Pressure plate traps don't work so well when the water sets it off well in advance or when you can simply swim over them.

Worst case, all the monsters flee the dungeon at once and mercilessly slaughter the party for their antics on the way out.

Grand Lodge

Drainage is a funny business. Just a 10 days ago my own gaming room was in the process of being flooded due to an endless decanter of water aka heavy rain - no joke.

What happened:
I'm living in an old Victorian Building. The Gaming Room/Dining Room is 5 foot below surface level. Living here for 20+ years - never had problems until ...

It started with a gas leak outside the building. Workers came - dug up a large hole in the pavement, fixed the gas leak - but fixing the hole would be a day later.

In the evening we had heavy rain. All the rain normally would just flow past the pavement - alas - the earth from the hole was on the road in a place that normally would be a parking space and blocking most of the drainage.

So all the water went onto the pavement instead - straight into the hole dug out. From there it found a way towards our wall. They had fixed the inside of the wall (absolutely dry where the gas pipe went in) - but I heard water gushing down inside !! the wall.

So my wife and son mobbed up all the water that made it inside (some 20 gallons) while I was outside - first opening up the drainage on the road - so the water would go past the hole and then with a bucket I would empty the hole.

Was like someone on sea in a leaky boat. Guess it took me a while to get nearly 100 gallons of water out of the hole before my bucket didn't work well anymore (too shallow).

We had been lucky as

a) We noticed just in time
b) The water stopped coming as soon as I emptied the hole part way
c) The water was surprisingly clean. Guess it filtered through some sand/gravel before coming into our house

The fascinating part: The hole itself drained a while later. There was mainly sand at the bottom and it must have found a way to drain towards ground water with a speed of at least a few liters a minute.

So we only had an issue as the whole surface water got redirected into the hole (and then into our house). Normally we are safe of flooding - it is the people 300 m down the road and 2m below us (a guess) who get flooded.

So if you want to flood a room that isn't the lowest in the dungeon - bring some bags of sand with you to keep the water in / redirect it. More or less that is what nearly caused our flooding with the earth plus tarpaulin on top acting as bags of sand redirecting the water where we didn't want it.

Horizon Hunters

Ravingdork wrote:
Good point about the hands, Thod.

You're welcome.


Pathfinder Roleplaying Game Superscriber; Pathfinder Starfinder Roleplaying Game Subscriber
Cordell Kintner wrote:
Ravingdork wrote:
Good point about the hands, Thod.
You're welcome.

Sorry, Cordell. Didn't quite catch your meaning earlier.

Liberty's Edge

How many Juggler Archetyped PCs (say for argument at level 20) would it take to fill up a 50x50 room that has a 10ft ceiling? What if they all have Time Stop?


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Themetricsystem wrote:
How many Juggler Archetyped PCs (say for argument at level 20) would it take to fill up a 50x50 room that has a 10ft ceiling? What if they all have Time Stop?

Well, the Juggler archetype does not enable a person to activate items, let alone activate items requiring the use of two hands, so for one Juggler with one Decanter, at 150 gallons a minute, for a space that size (187,500 gallons or so) would be about 19 hours, 49 minutes.

By the rules of time stop, I don't think any water would flow from the Decanter, but Time Stop lets you get 9 actions worth of activity in one round. At most a character can get 2 10th level spell slots, if I recall, you get ahead 270 gallons, saving you about 2 minutes.

So, 19 hours 47 minutes.
With two, about 10 hours.
three, 6.5 hours.
Your average adventuring party size 4, takes 4.94 hours.

My math gets very loose here, but it sort of follows that.

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