Drainage in long planters

If you have long planters, or some green areas in your balcony,roof garden or terraces you may need a drainage layer in your planter to drain or to direct the water to drainage pipes. For this purposes you may use some prefabricated drains made of a drainage layer and filtre covered around it.
Even you may use the prefabricated vertical drains (wick drains) like colbonddrain horizontally.