Water % affecting stamina regen.

[Gako21]

After lowering my stamina regeneration through a mod I've become increasingly aware of it. I noticed that when in the range of 75% to 100% water the stamina regeneration works just fine. However, below that things differ. When the water is between 50% and 75%, the stamina regen is 3/4ths of the norm, between 25% and 50% water it's half of that and under 25% it's only a quarter of the stamina generation. This change is, however, not seen in the character stats. Neither can I see this effect anywhere in the files. Have others noticed this effect and is it visible anywhere?