Ah. Is that why the pool's flat? No bumpmapping? Huh.
No? Pools are "flat" because their shaders simply aren't that interesting in a default game. That's all RLS-Shaders edits: it overrides the default pool shaders and makes them more interesting, adding wave effects and caustics by some ingenious shader and vertex programming. The engine was capable of it all along, Maxis/EA Games just disabled it all prior to shipping.
The "no bumpmapping" I refer to has to do with the cheat Gunmod would have you add to userstartup.cheat.