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As part of planning a LandBridge, it maybe a good idea to estimate the number of cartloads required. This should be easy, all you have to do is work out how many dirt you need to drop on each corner of the tiles to raise it above water level. Note don't take into account the dirt flow.
====How depth affects the dirt flow====
Any dirt dropped will flow to adjacent tiles keeping a maximum slope of 40...
The problem is that the dirt flows out in the 4 directions so...
<pre>
A---B---C---D---E
| | | | |
F---G---H---I---J
| | | | |
K---L---M---N---O
| | | | |
P---Q---R---S---T
| | | | |
U---V---X---Y---Y
</pre>
so if this area was flat and you dropped 40 dirt on corner M, it would just pile up, but if you now dropped 9 more there then it would raise corners G,H,I,L,N,Q,R,S and M up by one dirt. So to get corner M 80 dirt higher that it started you need to get corners G,H,I,L,N,Q,R,S up 40 dirt each, so you would have had to drop 400 dirt.
So to raise corner M up 120 dirt, then you need to get all corners 40 up, + 40 more for the middle ones + 40 for M = 25 * 40 + 9 * 40 + 40 = 1400 dirt (35 cart loads).
PS: I've assumed that the dirt will flow diagonally as well, but not verified it.
===Example: Vires LandBridge===
