Make leftover soil from surveys overflow into adjacent ones

[Smoopadoop]

I'm trying to flatten an area for a village, but I can't make surveys bigger than 30x30 for some reason. So I have to make around 15 individual ones (remember, we're capped to 5 per day), and individually match up all of their levels, and calculate how much soil i'll need/be left with, and then I have to dig the ones with too much soil, and then go and fill the ones with not enough soil, then I have to go back and forth and back and forth and back and forth and I want to die.

How about: When you dig soil in a survey where there's too much soil, if there's an adjacent survey without enough soil, it should fill that up.
Edit: Also, fill survey from dirt stockpile, or dropped dirt items.

[Beezer12Washingbeard]

Filling dirt from a stockpile is apparently a huge pain in the ass to figure out if I remember what loftar said correctly. However,
I like the idea of overflow from one survey filling in adjacent surveys that need it. I wonder if that'd be less of a pain to implement? If so, it'd be even more convenient than the stockpiles idea.

[Smoopadoop]

Loftar, show us the code so we can work something out

[jorb]

Full on fluid dynamics with XOR switches and everything to program multiple chained surveys to play tic-tac-toe.