The Collaborative International Dictionary of English v.0.48:

Statutable \Stat"u*ta*ble\ (st[a^]t"[-u]*t[.a]*b'l; 135), a.
   1. Made or introduced by statute; proceeding from an act of
      the legistature; as, a statutable provision or remedy.
      [1913 Webster]

   2. Made or being in conformity to statute; standard; as,
      statutable measures.
      [1913 Webster]