Abstract: An aggregate panel system comprising in one example: a rigid first panel having: a first side comprising a fluid impermeable, non-porous outer layer; a second side facing a first base wall to which the first panel is attached. Also disclosed is at least one optional panel brace fixed to the second side of the first panel and extending toward the base wall, the panel brace configured to increase rigidity of the first panel. An aggregate fill (e.g. concrete) is then poured or otherwise disposed between the first panel and the first base wall to fill the region therebetween. The aggregate fill configured to harden to a solid aggregate fill and thus structurally support both the base wall and the rigid panel.