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[Blah]

My current obsidian farm design is like this:

z2: 20x20 room filled with water. the floor has been removed and replaced by retractable bridges.
z1: 20x20 room. the floor has been removed.
z0: 20x20 room filled with magma

The obsidian farming itself works just fine but the design has one flaw. In the z1 room a new obsidian floor appears every time obsidian is created in the room blow. This has to be removed manually, row by row every time.

I've tried to fill z1 with two sets of many 20x1 bridges that would serve as walkway for my miners so that they could channel out half the room in one go (then after flipping two levers, the other half), but that doesn't work because it's impossible to channel the floor beneath bridges.

Is there a simple obsidian farm design that circumvents this problem?

[ASCIt]

You could always ramp up the obsidian level rather than just digging it, that would get rid of the floor above as well.

[orrey]

The design is fine, just build an access shaft to z1 and have dwarves walk out onto the floor to channel it out.  The key is to not mine in level z0 at all, so the floor won't cave, and you'll still get the same stone you would normally.