For future reference, there's no drains because large amounts of water should never be in the assembly. There are vents that allow small amounts of moisture out. You have a bad leak somewhere if that much water got into the assembly.
2011 Mazda 2 Sport - 5-speed manual - First retrofitted Mazda 2 in North America - TOTALED
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2012 Mazda 3i Touring Skyactiv - 6-speed manual - Corksport CBE w/RP, TRS Black Series clear lenses with DDM 4500K low beams-9011 HIR1 high beams-Full LED conversion in progress