Chronic Flooding

Oracle Text

Enchant land

Whenever enchanted land becomes tapped, its controller puts the top three cards of their library into their graveyard.

Card Rulings

10/1/2012 Chronic Flooding’s ability will trigger whenever the enchanted land becomes tapped for any reason, not just because its controller taps it for mana.
10/1/2012 Chronic Flooding becoming attached to a tapped land won’t cause its ability to immediately trigger. That land must go from untapped to tapped.