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Related to active drainage: active drain
See: outflow
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There is no need for an active drainage system to be created due to the placing of an upland wind farm.
Otologic examination revealed a tympanic membrane perforation with active drainage of clear discharge.
The latter has durable seam-sealed waterproof construction; nonmarking Super-Tack-Rubber outsole combined with Quadro-Grip Wave Siping that provides the ultimate in traction under wet or dry conditions; and an active drainage system and low water absorption materials to make these shoes dry fast; and an Aegis Microbe Shield that kills odor-causing bacteria so you stay fresh on your feet.

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