water drainage system for an upper and lower open shaft (1) enclosed by a floor, in particular a light shaft mounted on a building, with a floor-side drainage channel (4),characterized by a drainage pipe (4) contained in the drainage duct, which can be installed in the bottom (1) of the shaft (3),which has a seat arrangement (11) at its upper, one-sided end for a removable, with a sieve arrangement (14, 15) and which has a radially inward-facing stop at its inner side (7) for a drain pipe which can be moved from below (6) and an external one with a is equipped with radially external creeping water barrier (9).
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