EZ-Drain Gravel Free French Drains - evacuates up to five times more water than standard gravel and pipe french drains. (10' long with a slotted pipe surrounded by polystyrene aggregate and enclosed in geotextile mesh.) Also at Home Depot - 8 in. x 10 ft. Prefabricated French Drain with Pipe (Model# EZ-0802F Store SKU# 227495)
What to Put on the Ground in a Dog Run | Pea Gravel or crushed granite | Note: when I personally think about pea gravel I actually mean larger smoothed gravel, not the pea gravel you can buy at hardware stores. That stuff is a bit too small for large dogs and easily gets stuck between pads and some of the stone shards can be quite sharp.