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Do I need a drainage channel in front of the patio doors?

We have 3 large sliding doors from the living/dining/kitchen area to the terrace. The terrace is partially enclosed by a balcony (with its own drainage). One door is secured under the balcony, 2 doors are not closed. The terrace must be connected barrier-free.

Do I need a drainage channel only in front of the 2 unclosed sliding doors or also at the closed sliding door?

• drainage