Drain hole is located in a trough just above the container for vegetables (like use it on vegetables, you can for something else;). This effluent is located inside the refrigerator and not on the outside. In any case, if the drain is clogged someone advise for the short moment, increase the level of freezing to a higher level (though some are doing just reduce;)
It does not matter. The only sure method is to unclog the hole.