First: Thanks for adding carts in mines - this brings back fond (if dark) memories from the first map.
Second: I think my inventory above is representative for many a miner out there (No Merch cape, two slots reserved for keyrings and other personal belongings, 6 slots spent on almost max. water per slot capacity (unless I missed something)).
My thesis is that with this amount of q10 water (10+3 liters + one full initial bar of stamina), it should be* enough to mine the 160 ore one has capacity for in 4 chests + 16 inventory slots.
Currently this amount of stamina is only enough for 136 ore - thus the stamina yield of water should be* ever so slightly raised.
The extremist view sometimes voiced, changes the amount of ore one should be* able to mine to 196, for an additional carried chest, never mind the lunatics who wants to carry a boat.
Countrearguments:
"Drink tea, you cave adapted dwarf""
"You messed up noob, one can pack water much more efficient than that!"
*Ad lib.: substitute should be, with would be pretty darn convenient, if it were