3000 x 2000 px | 25,4 x 16,9 cm | 10 x 6,7 inches | 300dpi
Date de la prise de vue:
9 novembre 2015
Informations supplémentaires:
Beaver dam pipes Beavers diligently plug leaks in their dams because their survival depends upon the cover provided by the water in their pond. If a beaver can detect the flow of pond water into a pipe, it will plug the pipe with mud and sticks. To be successful, a beaver dam pipe must eliminate the sound and feel of water flowing into the pipe. Successful pipe designs (e.g. Flexible Pond Leveler, Castor Master, Clemson Pond Leveler) achieve this by protecting the intake end of the pipe with a cylindrical fence enclosure. A beaver swimming along the outside of the fence enclosure is unable to hear or feel the flow of water into the pipe and cannot reach it to block it. The pond level is controlled by the height of the pipe in the dam. Since beavers depend on water for their survival, the more a beaver pond is lowered with a pipe, the more likely it is that the beavers will try to build a new dam to return the water to its previous high level. In addition, the more a beaver pond is lowered, the more valuable wetland acreage is lost. Therefore, it is important to lower a beaver pond only enough to resolve the threat to human health, safety, or property. Culvert protection A culvert pipe under a road is a common target for beaver damming because the constriction speeds up the current and may resemble a hole in a dam. With a little work, a beaver can quickly plug a culvert with mud and sticks, and turn the entire roadbed into a large dam. Highway Departments often spend significant amounts of time and money repeatedly clearing beaver dams from culverts. Culvert protective fences The Beaver Deceiver (a trapezoidal shaped culvert fence) was invented by Skip Lisle in the 1990s while working for the Penobscot Indian Nation in Maine. It is very effective at completely eliminating beaver damming of a culvert. It works in three ways. First, the perimeter of the trapezoidal fence is typically 40 – 50 feet long, making it difficult for a beaver
