The Collaborative International Dictionary of English v.0.48:

Floatage \Float"age\ (?; 48), n.
   Same as Flotage.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flotage \Flo"tage\, n. [OF. flotage, F. flottage, fr. flotter to
   float.]
   1. The state of floating.
      [1913 Webster]

   2. That which floats on the sea or in rivers. [Written also
      floatage.]
      [1913 Webster]