The Flo-Gard® Trash & Debris Guard is often the only practical option to filter stormwater leaving sites with little fall from a parking surface, through a parkway culvert to curb and gutter outfall. It is designed to remove debris and has an optional Fossil Rock pouch for hydrocarbon removal.

Since it is a screen, no true “design flow rates” can be given. Rather, the inlet capacity of the culvert is usually derated by a safety factor of 0.50 to 0.75 to account for debris buildup between maintenance cycles.