French drains should be dug to a depth of 8 to 12 inches, for a 4-inch pipe, with a minimum of 2 inches of gravel on all sides.
About this Author
Thomas K. Arnold is the publisher and editorial director of "Home Media Magazine" and a regular entertainment contributor to various publications including "USA Today," "The Hollywood Reporter" and "San Diego Magazine." He has written travel stories for "San Diego Magazine," the "San Diego Union" and the Copley News Service. Arnold attended San Diego State University.