Triploid Grass Carp Permit

Barriers are necessary where triploid grass carp may leave the water body during periods of high water flow. In order to protect both the investment of fish for the water body as well as any vegetation outside the permitted area, barriers may be required before a permit is issued to stock triploid grass carp.

DO I NEED PERMISSION TO INSTALL A BARRIER?

Local, county, regional and state agencies may have jurisdiction or concern over stormwater and drainage. Construction of barriers, especially those which are not maintained, may result in problems with flooding. In order to reduce the potential for flooding, it is important to contact the agency charged (or your county if that agency is unknown) with water flow management in the site prior to installing barriers. They will be able to provide input as to acceptable barrier design criteria that will meet both your needs and theirs.

HOW SHOULD I BUILD A BARRIER?

Barriers must be constructed to allow a width of no more than 1½ inches in their narrowest dimension. It is not always advisable to affix barriers directly to openings in a culvert or weir, as they can restrict water movement. Where necessary to maximize flow potential, they should be installed in front of, but away from, such openings. Barriers should extend to a height above the normal high water line. It is preferable to utilize a two-or-three-sided framework design (V- or box-shaped) as opposed to a single-faced configuration.

It is advisable to use a series of parallel rods or bars, instead of a grid or mesh design. These can be oriented either vertically or horizontally, and maintained by raking away debris as necessary. A horizontal configuration is less resistant to water movement, and may require less maintenance.

DO YOU HAVE BARRIER EXAMPLES?

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Culvert Pipe Barrier
Outfall Barrier
Weir Barrier
Ditch Fence Barrier

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This page last updated October 01, 2008 .