Water depth puts some restrictions on various actions:
* Water table: moist tile (+/- 0) no drink option available, moist tile (no plant [[Sprout]] nor , no build house nor , no meditate)
* [[Water tile]]: below water level (<= -1) drink, refill options available
* Passable by shallow draft boats: Five below water level (<= -5) ([[Crude canoe]]s, [[Rowing boat]]s, [[Small sailing boat]]s, [[Knarr]]s)