  Let $R$ by a right coherent ring and $R$-Mod denote the category of left
$R$-modules. We show that there is an abelian model structure on $R$-Mod whose
cofibrant objects are precisely the Gorenstein flat modules. Employing a new
method for constructing model structures, the key step is to show that a module
is flat and cotorsion if and only if it is Gorenstein flat and Gorenstein
cotorsion.
