Abstract: A liquid containment structure such as a frac pond has a perimeter wall; a floor liner bounded by the perimeter wall; and a platform underneath the floor liner, the platform formed of a plurality of mats laid edge to edge and whose upper faces collectively define a support surface. Related methods of use of the structure include installing the structure at a well site, and in some cases using the structure as a frac water pond. A drain channel may be defined in the support surface below a portion of the floor liner, with the portion of the floor liner extending downward into the drain channel.

Abstract: A liquid containment structure such as a frac pond has a perimeter wall; a floor liner bounded by the perimeter wall; and a platform underneath the floor liner, the platform formed of a plurality of mats laid edge to edge and whose upper faces collectively define a support surface. Related methods are disclosed.