This paper written for the USDA is a very useful look at the biology and management of the beaver. It was written by Steve Boyle and Stephanie Owens, Mr Boyle was kind enough to respond to my email asking about successful urban maintenance of beavers.
He directed me towards Telluride Colorado where the city’s geological “bowl like” structure means that the creeks collect massive rainfall in a hurry and raise concerns of flooding for weathy property owners. (Sound familiar?) He illustrated the management plan that Telluride uses for beavers and other wildlife which you may want to check out. A great resource that is not so far away from our backyard.