What they do:
Beavers, while known mostly for chewing on trees, also provide a key role to the environment. Many species rely on beaver ponds to survive. These ponds also decrease damaging floods, decrease erosion, and help remove pollutants from surface and ground water.
These elusive rodents do provide many benefits to their environment; however they can also become an expensive inconvenience. Destroying dams and altering habitats is not effective in getting the beaver to move elsewhere. The beaver can quickly repair the damage or rebuild in a days work.
Relocating beavers is a nearly impossible as many are extremely territorial. Many places find lethal trapping is the most effective beaver control. However, lethal traps can also pose a danger to other wildlife, pets, and even people. Lethal trapping is an extreme measure and methods to prevent tree destruction should be implemented first.

What You Can Do:

If you have a problem with beavers damaging your property there are some solutions to prevent tree damage (the most produced complaint with beavers) and allow nature to be left alone. 

•  A rigid welded wire fence using 4 inch mesh at least 36 inches high may be placed around endangered trees. 
•  You should leave a gap of 2 to 3 inches from the fence to the tree to allow for tree growth. 
•  Cut strips large enough to encircle the tree. 
•  Avoid using soft chicken wire. 
•  Never wrap the tree tightly or nail fencing to the tree. 
•  Also make sure to secure it to the ground to protect the roots. 
•  This wire may need to be replaced every couple of years depending on tree growth.