[HeLiOn_PrImE]

Handling the water level will be tricky and could cause huge issues. Don't forget that the water level doesn't exist on all the surface, hence the known glitch in which players would fall under the map to be respawned shortly after. That thing happens because there is no water surface, and the players fall under it's level.

So besides the water level variable, there should be parameters regarding the area in which you want to create water. Further more, you would need a function that removes the existing water from an area.