A French Drain can be a part of a Drainage System or can stand alone. A Drainage System is made up of one or several types of Drains connected in sequence moving down hill toward an exit or release point. What makes up or determines the recipe of a Drainage System depends on the "Drainage Diagnosis." Every Drainage System is unique to some degree.
For Example, A four inch French Drain may run across a hillside, transition to solid 4 inch Solid Drain Pipe while running under a sidewalk, then connecting into a 12 inch Surface Drain in a low spot, Solid Drain Pipe then could continue to a garage foundation where the Solid Drain Pipe changes back to 4 inch French Drain again and runs along the foundation for say 60 feet. Next the French Drain changes again to 4 inch Solid Drain Pipe and continues under a fence to a Pop-Up Emitter which is the exit point. This again is just one example of a Drainage System with 2 French Drains and one Surface Drain being the main parts. This would be considered a "Complex Drainage System."
A simple Drainage System might be a 6 inch French Drain running along a driveway, turning slightly and changing to 6 inch Solid Drain Pipe and continuing to a Curb Fitting as an Exit Point.
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