Missing surface.

I play gmod and inside any map with water even on construct has no surface, i can see the entire area thats suposed to be underwater yet when i go under water i can see the water effect like murky veiw ect, i know im missing this effect but where can i get it again and what do i need to do?

P.S. i already reinstalled gmod and hl2.

you could get GCFScape and manually dig it out of the hl2 files if it won’t do it automatically. As for what file and where to put it I have no idea.