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[danaris]

I have a wounded dwarf, who I was lucky (?) enough to happen to take a look at just as my chief medical dwarf was diagnosing him.  The diagnosis showed compound fractures, cut tissue, and smashed tissue of a few different organs (he had mixed it up with a feathered python forgotten beast recently).  All well and good. 

His left thumb needed washing, so my CMD grabbed soap and water, and washed it.

As soon as he was done, I took another look at the poor wounded dorf, and the skin of his left thumb was infected.

Isn't that exactly the opposite of what's supposed to happen...?

[CognitiveDissonance]

Was it soap from the aforementioned forgotten beast?
Maybe the poor sod is now allergic to it

[Skorpion]

Stagnant and/or dirty water can cause infections.

[FuzzyZergling]

If the infection gets bad, re-injure him to have him re-diagnosed and re-cleaned.
Having a well inside the hospital helps with the stagnant water problem.

[danaris]

The soap was one-humped camel soap (made some time earlier).

The water was from a well just outside the hospital, and I checked its reservoir for contaminants.  There were none.  How can I tell if the water is stagnant?

Would it help to extend the hospital zone to cover the well?

How do you propose re-injuring him?  He's Resting, so I can't exactly tell him to do anything...

[Torgan]

If you use k to look at a bucket then you'll see what it contains, could well be 'water laced with mud' like I get from my well.  The bucket will probably still be under the injured dwarf.  On the plus side, I think the only time I've seen infection kill people was when the flesh was rotting off them due to a FB's blood (and technically they bled to death).  I never see any noticeable effect on any other dwarfs that are infected.

[danaris]

Well, I've already had two dwarves die of infections from wounds, one of whom had been completely healed of the wounds themselves.

I'll take a look at the bucket and see what I see. 

If it is filled with mud, then how can I make a well that's safe?

[Torgan]

Now that I am still a bit fuzzy on, and there's not much in the wiki.

On my current fort I have just made a well over a cavern pool and that's coming up laced with mud.  On another fort I did the same over an underground lake connected to the sides which was also providing muddy water, however I channeled out some of the side, put a well on the water itself in the newly filled area and that was pure water.  Likewise with wells placed over brooks and rivers.  I've really no idea how to avoid the muddy water other than fluke it.

[kilakan]

If the wells directly over the initial pool of water, it will be laced with mud, think of it as the bucket scarping the bottom of the pool, what you should do is build a stone resivour under, or beside the water source and move all the water there then build the well over it.

[danaris]

To clarify:
I have an aquifer on level 146, tapped and blocked off with floodgates.

I have a reservoir on level 139, into which water can flow from the aquifer (when I open the floodgates) down a series of stairs and through a diagonal, to avoid watery Fun.  The reservoir is also sealed off by a floodgate, for the sake of flexibility (it's not the only thing that's part of my water system).

I have an overflow tank on level 138, blocked off from the column of water by more floodgates, which I can use to drain the reservoir if necessary.  (It may take a few cycles of open floodgates, let it fill with 1/7 water, close floodgates, wait for evaporation, repeat, but it works.)

The hospital and well are on level 140, with the well 4 steps outside the hospital's door, in a little room between there and my main fractal housing complex.

So...should I drain my reservoir, dig it one level deeper, and fill it up again?  Would that ensure that the bucket is always going into safe water?

Or am I still confused?

Also, does anyone have any advice about "safely" re-injuring my dwarf so he can be re-diagnosed and re-cleaned?  (It would be convenient if I could manually put in a diagnosis request  )

[Quietust]

My first 0.31.xx fortress used a cistern that was filled from a brook (through a diagonal gap to prevent flooding) and the well was exactly 1 Z-level above the bottom of the cistern, and while the water was not laced with mud, it was "stagnant". I even tried inducing permanent flow (by allowing it to simultaneously fill and drain off the map edge, a trick that has also worked with my dwarven water reactors to allow me to leave them "shut off" and still generate power), but it didn't make any difference.

By comparison, my 2nd fortress has both of its wells built directly over a real river (complete with "river" tiles below, no mud), and all of the water is clean.

It might be worth trying to construct fortifications directly beneath the wells, since they never seem to get muddy.

[FuzzyZergling]

A guarenteed method of cleansing water is to put it through a pump, directly into an artificial (constructed walls and floors only) cistern, without the water touching any natural walls of floors after being pumped.

[Quietust]

It might be worth trying to construct fortifications directly beneath the wells, since they never seem to get muddy.

Cancel that - I just tried, and it prevents the bucket from entering the square (and marks the well as Dry).

[CognitiveDissonance]

I can answer that, actually. You need a well that is at least 2-Z deep. As long as the TOP water level is just 7/7 water and open space, you will be getting pure water in your wells.