(This information is provided courtesy of E.J. Olbright.)
Beavers have become so numerous in many areas of North America that they have become a great challenge for wetland managers and a nuisance for some private landowners. The most effective way to control surplus beaver populations is to remove them via hunting and trapping. A less labor-intensive method of managing beavers is through the use of beaver-resistant water-control devices. Among the most widely used of these structures is the Clemson Beaver Pond Leveler. A wire cage surrounds the water intake device (a perforated PVC or plastic pipe) preventing beavers from blocking water entering the structure. Detailed written specifications for constructing and installing the device are available online at http://www.dfr.state.nc.us/managing/www/beaver_pond.htm.