That is EXATLY the problem i have
under the water is fine, but the top surface NEVER works..
it works on de_rats and azzy, piranesi T spawn etc, so i know my pc can handle it...
Stick in a water_lod_control entity and see if that fixes it.
You have the nodraw texture on all faces except the top face, correct? With that and the water_lod entity (which can be placed anywhere btw) it should be fine.
Well, I say fine - I still don't know how to get it to reflect other props and such, unless there's something up with my detail settings - must investigate.