Pot Holing is the hydro excavation technique used to locate known subsurface utilities. It is similar to line locating, except that this approach is used when the exact position of the utility is known.
Potholing is most often used when a contractor needs to verify the depth, size or type of underground utility. Potholing is also utilized for catholic protection procedures or to safely excavate holes for pole hole installations.
Like most hydro excavation methods, the process starts with a simple pot hole (8 to 12 inches in diameter). With the vacuum system hovering over the designated surface area, the operator excavates straight down into the ground until the marked, known utility is located.
If the utility structure is not found, the pot holing procedure gives way to line locating, one of the most efficient hydro excavation methods of locating subsurface utilities.