Occasionally, with very persistent beavers, the two deceiver methods may need to be combined (i.e. a Trapezoidal Fence with a Pond Leveling Device attached). This picture is the installation of the combined devices at the culvert under Route 301 on Canopus Lake in Clarence Fahnestock State Park. A boat was needed to move the dome and pipe around in the deep water.  Photo by Lilly Schelling