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[laularukyrumo]

Why has no one suggested obsidianizing the map-edge water? Seriously. It's so obvious.

You can even do it via minecart delivery if you want precise strikes.

[itg]

If you cast obsidian on the lake's edge, you could build the drawbridge in front of the obsidian, then carve fortifications in the obsidian to restore water flow (I've done this before, so it definitely works). I know it's not what you want to do, but it's a good plan B.

Why has no one suggested obsidianizing the map-edge water? Seriously. It's so obvious.

You can even do it via minecart delivery if you want precise strikes.

It was mentioned with reasons for rejecting the idea in the OP, for one.

[smjjames]

Why has no one suggested obsidianizing the map-edge water? Seriously. It's so obvious.

You can even do it via minecart delivery if you want precise strikes.

I can't obsidian cast, because if I cast obsidian at the edge I'd never be able to mine it out, and I need the water supply.

Because he doesn't want to get rid of the water source tiles. Although, you don't have to obsidianify ALL of the edge tiles.

Edit: Somewhat ninja'd.

[wierd]

I agree with ITG. You can carve the edge as a fortification to restore flow.

Additionally, you can obsidianize "around" the active edge, then have the bridge 2 tiles from edge.


So, you have ITG's "plan B", and here's a possible "Plan C".

OOO
W|B
W|B
W|B
W|B
OOO

You obsidianize 2 map edge tiles, then 4 tiles just passed that, to trap the flow. Then build the bridge. Channel out the obsidian cason from above to open it up. 

Do this however many times or as many tiles wide as you want your bridge inlets to be. 7/7 water teleports, and the 2 tiles of flow are not going to significantly arrest that if done right.

**edit

I presume the reason why you want it "exactly" on the map edge, is to resolve the issue of supporting the created obsidian floors, so that you don't get endless "cavern collapsed!" Spam.

To resolve:  send water down an up/down constructed staircase directly on top of the magma. The created obsidian floor will be temporarily supported by the stair, until it connects with the map edge.

[edgefigaro]

If you cast obsidian on the lake's edge, you could build the drawbridge in front of the obsidian, then carve fortifications in the obsidian to restore water flow (I've done this before, so it definitely works). I know it's not what you want to do, but it's a good plan B.

Why has no one suggested obsidianizing the map-edge water? Seriously. It's so obvious.

You can even do it via minecart delivery if you want precise strikes.

It was mentioned with reasons for rejecting the idea in the OP, for one.

Thank You! I had no idea that fortification carved obsidian would work, I had never considered. That may suit my needs...

In a related note, I'm 2/3 of the way to the retooled aquifer punching technique with screwpumps.

I am going to finish this little project and then work on my magma cistern/pump stack. I'll use that to seal the rest of the rest of the cavern layers, as cavern layers one and two are going to be significantly more troublesome. 

Extra Happy Bonus Question: Can anyone come up with a plausible way to seal the magma sea's edge?

[wierd]

Seal magma sea's edge....


I don't think you can completely evacuate a "flow" tile using a screwpump, can you? If you could, then you could back-flow water in.

[Pitchblende]

This fellow drained the magma sea, complete with step by step guide.

[edgefigaro]

I'm close. I've done two trials, both failures. There have been complications. 

The major problem I've been having is water wheels not operating and power loss, and me not quite understanding how pressure/flow interact. The first trial, there was a mechanical error and none of the pumps worked. I was able to build a single wall against the edge, and no bridges I was hoping to avoid building a reactor, but that looks like the next step. The screwpumps are sufficient to keep the edge tile at 1/7 for significant periods of time, enabling construction.

I have a two pronged technique. The screwpump, as pictured, but also an attack from below as well.  I think I'll have a writeup soon.

At this point, it may be a toss up between which is easier/less work. Mass Screwpumping is effective, but non trivial to setup. I'll be able to do it without screwpumps easily enough if I alternate obsidian Castings and water tiles and attack from below, blocking the edge with floodgates ultimately. I won't have to constantly build and rebuild machinery as I go up through the cavern layers, but I will have to build carve/build large amounts of minecart tracks, and get a minecart magma delivery system up and running.