question about infiltration

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i'm noticing that many properties in my area (sherbrooke quebec) have infiltration. is this something to be concerned about? are there certain types of infiltration that are worse than others? i recently purchased a duplex, and if it rains hard a bit of water will trickle into the unfinished basement, which isn't really a problem, but i assume there can be more extreme cases. what are your opinions and experiences on infiltration, and are there specific types i should watch out for? thanks,