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Beaver (Castor canadensis) dam-induced flooding has been controlled by use of beaver pipes in New Hampshire. These pipes, of fiber or wood and with multiple small openings along the length of the bottom portion, are placed through the dam and into the beaver pond. Height of outlet and length of pipe are factors in producing the desired water level. Installation of wire-mesh guards across the mouths of culverts tends to discourage rebuilding in culverts after the existing dam has been removed. New Hampshire now has 46 beaver dams with pipes installed and working well. All installations must be checked monthly and maintained as required. Beaver pipes are most useful on watersheds of less than 10 square miles. If culverts are involved, the maximum usable watershed is reduced to 4 square miles.
The Journal of Wildlife Management © 1963 Wiley