Yes they do course floods,it’s their natural behaviour.I’ve also never heard of fished lines due to beaver presence here although they do effect other animal life (usually land animals that lose habitat to the beaver ponds or depend on the same trees the beaver eat)
Interesting though regarding the flooding: they usually cause floods here.
The issue in the uk is slowing the rise of floods which reek havoc & destruction to all life.( I’m sure I had this discussion before somewhere)
A woodsman/ yurt & roundhouse builder friend of mine who never had much to say had a idea from the medieval period, ‘twas simple & said it would work..fashion natural Wattle fences & stick them where the water is known to speed up, that’ll do the job is all he said?( probably benefit the fish too)
Maybe that’s worth a go if not temporary for a few years..similar reason,same results.. we haven’t had beavers since the 16th century, so no beavers, no controversy.
But what if it worked?
I’ll say no more.