Be careful ..................

You are responsible for any and all damage downstream.

If the water kicks out someones road or driveway, you are responsible for the damage.
If the water behind the dams have heavy metals in them and they go down stream and kills fish ..... yep your responsible !
Let me tell you a story.
I was contacted with a company that had access to the land and needed to drain this pond so they could get their machinery in there.
I trapped a pile of beaver out of this fairly large pond one day.
I was there when a guy with a backhoe pulled a tire out that was in front of the culvert pipe.
The water rushed out of there so quick that the guys Boss said: "Put that tire back in there now"

Well once that tire came out there was no way it was going back in.
The water ran out and took out two driveways a mile away.
The company had to replace both driveway culverts and fix the two roads going into their property.
Cost to the company was just shy of $15,000.00
I have taken out a lot of beaver dams in my Business over thirty years. There is a proper way of doing it.
Look into how it is down and be careful. Both for your safety and others including fish and wildlife.
I Highly Recommend two things and that is first make sure you are a license business and second have some Insurance (at lest one $ million ) if you plan on doing this kind of work.
JC