[Terrain afects walking]

Well, first at all, the english not`s my native languaje so sorry if you can´t get me and this is my fisrt post, so...

Hello everyone, i´m searching for a MOD it can do something like... depend of the terrain where your character are walking, his velocity decrease... Like rivershore or seashore, mounds of snow, high grass... i don´t find nothing like this and i know maybe that´s hard to do it but, who knows?

Thanks everybody