You ever notice how in Skyrim, swimming is just as fast as walking? Thats... Unimmersive. In real life swimming is slow, often dangerous and requires preparation. But thankfully with Drowning - A Mod Where You Cant Swim you will need to weigh your options carefully before you enter the water. When Swimming, you move slower, you take damage, and you CANNOT open your inventory(Which prevents you from gulping down Health and Water Breathing potions). Also to make matters worse Slaughterfish now do more Damage.

Features:

• Swim Speed Reduced by 75%
• Swim Speed Increases by 10% if you are naked. 
• Swim Speed Increases by another 10% if you have a waterbreathing effect active. 
• You take significant Stamina damage when you swim unless you have a waterbreathing effect active.
• After Stamina has been depleted, You take Health damage when you swim unless you have a waterbreathing effect active.
• You cannot open your intentory in water unless you have a waterbreathing effect active.
• PlayerRace NPCs all have slower speeds in the water similar to the player. Argonians are slightly faster.
• Horses also have slower speeds in water.
  

Note: No NPCs will take damage from being in the water. This is to prevent 
stupid nonagressive NPCs from getting stuck in the water and dying.

Another Note: As it currently stands the NPC features of this mod are incompatible with other mods that adjust Race profiles. Put the esp at the front of the load order to have these features be ignored in favor of other race mods. Put the esp at the back of the load order to have these features be prioritized over other race mods. 

Changes in v3.1:

• Removed Slaughterfish Feature
• Health now drains a little faster in water.
  

Changes in v3:

• PlayerRace NPCs all have slower speeds in the water similar to the player. Argonians are slightly faster.
• Horses also have slower speeds in water.
  

Changes in v2:

• Stamina must now be depleted before Health is affected. Drain values have been bumped to compensate.
• Stamina drain is now at 15 instead of 10.
• Health drain is now at 7 instead of 5.
  

FAQ:
"But what about Argonians? Shouldn't they be able to swim?"

If your character has the Waterbreathing ability they will: Move 10% faster in the water, Won't take damage from being in the water, And Will be able to open their inventory in the water. This includes the waterbreathing Race ability of the Argonian as well as waterbreathing Potion, Spell, Perk and Enchantment effects.

Requires:
SKSE

Installation:
Drag the contents of the zip file into your skyrim Data folder.

Credit:
Thanks so much to Nitor and his Better Swimming mod which was the framework for this mod.