Texture Of The Water Light Effect

Im creating a map to do with the aquatic side of Black Mesa and I am having trouble finding the texture found in one of the Surface Tension levels it is within the new c2a5g but whenever I locate the map file it will give me the older version, I also checked the map_dir files and it doesnt seem to be there.

Just decompile the map:

I already have as I said it is the older map in both the dir and mapsr