I put Activator: my version of "Water1024" in my cave. My interior has checked "Has Water" and correct WaterType.
Unfortunately I have some problems with water:

1. I don't know how to set correctly properties of my water; I want my water to be very dark under surface, but unfortunately I can see walls and floors which are few thousands of units away from me - I should see only this what is <5 m (<500 units) away from me. I tried many settings, but I can't get what I want. How to do it?

2. In render window in CK my water has small waves, but in game water doesn't have any waves, when I don't move (when I move, waves are much smaller than in CK, if any). How to get small waves for all time like in CK?

Nobody has ever made any water for cave/dungeon?
Nobody knows?

Well I have, but not a river ... just a riverbed with not much water, really.

However: Water in interiors is not like exteriors. So I don't think that Water Type or Level effects it. It is as deep as you make the distance between the water-plane-object and the surface below it. I think I remember reading that someone had found a maximum depth, before the PC could dive out below the bottom of the water, though.

As far as I know (and remember) you could not change the visual effect beneath your surface (its kinda fake water, in internal cells). Have you looked at the lighting options for the cell? (I don't know if that will help though).

As for waves, there are different types of water-plane objects, I think some will give you a faster current ... Though the depth may effect that as well ... and lighting might also need adjusting if you want to really see them. You might find that a particular plane does give murky water (I have not used every one of the water-planes in the CK)?

There is a Water Velocity Tab on the Reference form (double-click object in cell-view window). I never messed about with it; but does it make waves? (Does it do anything?)

Oh yes ...Water-plane-objects also have a Tab of "Water Lights" ... I never figured out what this did (maybe someone knows?) ... and this: http://www.creationkit.com/Reference does not mention it ... and a search of the wiki produces nothing too. Is it just another non-used function?


(Internal water is a little bit rubbish ... compared to the external version, I think)

Lighting for cell is enough dark (I don't want completeley dark cell - only very dark deep water of my small lake in my cave).

Velocity for cell or water doesn't work (In game I have no waves for all time; in CK I have waves all time).

Murky water also doesn't change transparency under water.

Water in Oblivion is more friendly and customizable; in skyrim - I have no words... just bad (for modding).

So there is no possibility to make dark water (deep water) for cave/dungeon (without change of lighting for whole cell, only change of water).

There is more than one water type.

Try several you'll find one that closely fits.

My first Skyrim mod had three or four water types that fit the mood of the interiors I was trying to accomplish. They did a superb job of duplicating actual caves I've explored.

Here's an example:

http://www.pcgamingnetwork.com/tmp/skyrim/leap-of-faith-r.jpg


And here's another
http://www.pcgamingnetwork.com/tmp/skyrim/blue_room.jpg

The way I found to control waves in interior water was as follows:

1. Find the water plane that most closely matches what you want for a particular body of water.
2. Duplicate this base object (highlight it, press F2, type in a new name. It will ask if you want to create a new object. Say "Yes")
3. Now you can edit your copy of the base object to set various parameters to customize the waves and current.
4. Create a reference to this customized object in your interior cell and continue to tweak the parameters until you get the results you want.

I did this in a cave I created that had a waterfall that poured into a small deep pond. I used vanilla effects to get the splashing and ring of ripples where the waterfall impacted the surface of the pond. It looked great close to the effect but farther away the water was perfectly calm. I customized my water as above and set up a small current with small ripples so that the surface of the pond moves as one would expect from having a waterfall crashing into it. There is a lot of activity in the area of the effect and as that tapers off further from the base of the waterfall you start seeing more of the surface movement that is produced by the settings in the water plane.

I am at work, but in a few hours when I get home from work I will see if I can post a screenshot of the settings I used (I'm not sure if I can since the forum may require a certain number of posts before one is allowed to upload).

One thing I found was that the current direction settings appear to be relative to the world and not the plane. I found that rotating the plane doesn't change the direction of current. The only way I could change the direction of current was by editing the settings of the plane. That's not a problem but it means that if you need to use the same water in a different area but want the current moving in a different direction you will need to create a new copy of the base plane and change the direction there.

Unfortunately, I didn't play with the underwater lighting so I don't know what can be accomplished there.

I set in my water type: Wind Speed, Amplitude Scale and UV Scale on full (1, 1, 10000) and waves are still not moving, while I'm not moving. Whole water just stops (waves are on the surface, but don't move). Velocity is set on 0.44 (any changes don't make anything). In CK everything works perfectly.


Transparency:
I tried few water types and nothing. I tried to set fog: above -200/-200 and under -300/200, amount 1 and still no effect - deep water is clear, but I want very foggy/dark. I set color of deep and shallow on black.

I am on the beginning of the game (in Riverwood), so anyone could give good example of dark water in a cave or dungeon (dark and deep water) which is in the game?