My fog simply wont move in the y axis  !!

I simply want to create fog y*12  and with an alt of 2 but when i render
my scene the fog remains below the water level (10) and the picture is as
clear
as a bell!!not  good

heres the fog code ive used, unless im very short sighted i cant see
anything
wrong!!
fog{
    color rgbt <.5,.5,.5,.5>
    fog_type 2
    fog_offset 12
    fog_alt 2
   turbulence <2.5, .15, 2.5>
   omega 0.35
   lambda 1.25
   octaves 6
}

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