A French drain is a rock or gravel-filled sloped ditch that often has a perforated pipe in it. Redirecting surface and groundwater away from places where water pools or gathers is the aim of a French drain. Naturally, water will seek for niches in the earth and flow downward. Groundwater seeps into the French drain's rock bed from the sizable crevices in the rock. After entering the p... https://texasgardenmaterials.com/landscape-design-houston-tx/french-drain-installation-houston-tx/