They should exit the car thru the boot, towards the very rear of the car, and come out thru a hole and appear behind the bumper, just behind the rear wheels. If you cant find them behind the bumper (best to remove bumper) check your spare wheel well isn't full of water, because thats where the water will end up! Just in the process of changing my drainage pipes for a rubber alternative, originals are a plastic type. Roof lining out time :-(