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[FortunaDraken]

So two of my dwarves are currently dead of drowning in a murky pool. Said pool is however attached to the stream, so I can't drain it since the stream will constantly refill is.

There is a one tile choke point between the two, so I need to put something there. The question I have is how to do that? Does a cave-in result in a wall if I collapse constructed walls? Or am I going to have to get fancy with pumps?

[Bumber]

Pumps or obsidianization (using hauled minecart method.)

[NullForceOmega]

Don't even really have to get fancy or anything, you can place a single pump so that it's intake square is the single tile gap, and pump right back into the stream.  If the stream is a brook, channel the output tile and put up walls around the front of the pump.

[FortunaDraken]

Yeah I got one set up to pump back into the stream. Had to cheat a tiny bit and put lava in to block off the stream from the pool. Got one corpse back, just have to get the other one now.

[Chief10]

Pumps or obsidianization (using hauled minecart method.)

Does this involve a dwarf hauling a minecart, or does the cart have to be on tracks for this?

[PatrikLundell]

A dorf can carry the cart. You need to have a track stop constructed beside the tile the magma should be dumped in, and it has to be one level above the water in order not to just get everything evaporated into steam (or possibly deadly magma mist), I think. The track stop should be set up with the dumping direction on construction, unless DFHack is used, in which case it can be changed later.
You then need to set up a Route with a Route Stop on top of the Track Stop (don't forget to remove the default departing conditions), and then assign the filled mine cart to that Route Stop.
The mine cart has to be magma safe (iron/steel/candy, but NOT nether-cap). To fill it you can either use the route through magma technique (which I don't use), or the pumping technique, where a magma safe screw pump (all parts, typically gabbro block and green glass tube and screw) is created on top of a dug magma filled tunnel with magma safe grates covering two acess holes with two tiles in between. The pump is placed on these tiles and manually pumping up from the first grate and out above the second on (draining downwards). I always enclose the pump with walls and magma safe doors, which may or may not be needed. A second (or rather, first) Route is created with a Route Stop at the pump's output tile and the cart is assigned to the Route Stop. When the cart has been placed, the pump is hand cranked briefly, and then the pump is stopped and the cart ordered to be placed on the destination stop.

[Bumber]

Pumps or obsidianization (using hauled minecart method.)

Does this involve a dwarf hauling a minecart, or does the cart have to be on tracks for this?

Long explanation short, you fill a non-assigned minecart with magma and have it hauled via magma-safe wheelbarrow to a stockpile. From the stockpile it goes to a nearby track stop (you can assign it to a route, although there are other ways to get it onto the track stop) that dumps the magma where it needs to be. There's a full explanation on the wiki.

[PatrikLundell]

I've never used a wheel barrow for magma filled mine cart hauling, and have yet to have any dorf burned by it. I also assign the mine cart directly from the filling route stop to the dumping one, without taking a detour over a stock pile (except for the known bug where a hauler gets tired and puts the mine cart down two tiles from the destination and someone else hauls it to a stockpile where a third dorf hauls it to the destination).

[gestahl]

The wheelbarrow just saves time, dwarves will haul the minecart by hand if necessary without damage.

[PatrikLundell]

The wheelbarrow only saves time if the stockpile the mine cart is hauled to is sufficiently much closer to the destination than the loading station that the extra wheelbarrow speed compensates for the additional distance and the task being split into two jobs, but yes, it does make sense.