Access water4 scripts via my script?

Hello, i’m trying to access the folowing scripts and their values from my script, but my script doesn’t seem to see those water4 scripts.

Picture of what i am trying to access:

I tried using following code but it didn’t seem to work(it doesn’t see the WaterBase script and such).

GameObject water = GameObject.Find("Water4Advanced");
WaterBase wat = water.GetComponent<WaterBase>();

WaterBase unknown for it ;/

How to do that correctly? ;D
Thanks.

I had to add this line at my script:

using UnityStandardAssets.Water;