It doesn’t have to be a failure, sometimes just opening a spillway is enough to flood certain islands. I’ve seen a video (probably Tom Scott, but not sure) of a dam where the spillway is opened every day to show tourists what the downstream river looked like before it was constructed.
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Though if you hear seven or nine blasts, definitely stick around for the barbecue!
It doesn’t have to be a failure, sometimes just opening a spillway is enough to flood certain islands. I’ve seen a video (probably Tom Scott, but not sure) of a dam where the spillway is opened every day to show tourists what the downstream river looked like before it was constructed.