Rain Ripple position problem

Hi all ! (sorry for my bad english)

I have some problem with our ripple from our rain system, derived of tutorial i’ve found on the forum.

We have a Rain particle which generate event, and my ripple received this event to generate ripple effects on ground. The system actually work, but our problem is that ripple only generate on the same Y level as the character, and not by the height landscape…

Here is a screen showing this :

I don’t know if useful but here is my particle system (very simple) :

Hope someone can help me on this.

Thanks !

No tips ? If you need specific screen tell me !