How do I flood a mine?

Question

I have built an aqueduct from what seems to be the sea to the underground level. But the water level never rises above 1 tile of depth. How to make it 2 tiles of depth?

Answer

As suggested by BlueRaja - To further my comment on StrixVaria's answer:

You should be able to create a deeper pool using source blocks that you place against a temporary vertical surface.

Basically, fill the bottom of your pool with sources by dropping buckets of water. Keep dropping water until the surface is flat, if you can see water flow into a square, then thats where the source needs to go. This will give an even 1 deep pool. You're not finished yet.

B is solid blocks.

W is water sources.

    B      B
    B      B
    BWWWWWWB
    BBBBBBBB

Build a line of blocks directly over the water sources, this will give you a surface to drop a line of water sources against.

N is the line of new blocks (from the side).

    B      B
    B  N   B
    BWWWWWWB
    BBBBBBBB

Start dropping another layer of water sources in the "trench", using the sides of the pool and the sides of the line of blocks to drop the sources against.

    B      B
    BWWB   B
    BWWWWWWB
    BBBBBBBB

Create a new line of blocks just outside of the existing one, then remove the existing line.

    B      B    B      B
    BWWBN  B -> BWW N  B
    BWWWWWWB    BWWWWWWB
    BBBBBBBB    BBBBBBBB

Drop another line of sources against the inside of the new line of blocks.

    B      B
    BWWWB  B
    BWWWWWWB
    BBBBBBBB

Continue across the surface of the pool until you've filled in the second level. A third level can be placed in the same way.

   BWWN   B
   BWWWWWWB
   BWWWWWWB
   BBBBBBBB

Note that it's possible to simply ignore the lower levels and just have an area of sources on the surface, like this:

   BWWN   B     BWWWWWWB
   B      B  >  B      B 
   B      B     B      B
   BBBBBBBB     BBBBBBBB

This can still be used to provide a pool deep enough to fall into, but will actually be fairly difficult to swim upwards and out of.

Check more discussion of this question.

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