These simple structures can be made by a fabricator or hobbyist welder. Installation takes 1-2 hours and is easiest under dry conditions.
Materials list:
- Custom-fabricated three-sided connector box sized to fit the weir you are protecting
- 10 to 20-foot long 24”-diameter HDPE culvert pipe with holes for rebar pins on both ends; pipe should be perforated 4 rows of 4-inch-wide holes with 1-foot spacing between them, making sure one of these rows is on the bottom of the pipe.
- Custom rebar pin to secure pipe to steel cylinder on front of box
- Concrete block with an attachment point on top (?) or a custom-fabricated metal support for pipe
- 8-foot-long galvanized chain to secure pipe to support
- Ask Brock about hardware to close the chain (nut, bolt, lube)
- Hog paneling or custom-made grate sized to cover 24-inch-wide pipe inlet
- If connector box lid does not cover weir itself, you will need to build another grate to cover the top of the weir
Tools for installation:
- For dry installations, a backhoe; for wet installations, an excavator
- Laser level (or other means to level concrete block with weir)
- Rope or chain to secure device to backhoe or excavator bucket
Instructions:
- Clean the twin track weir of any debris.
- Dig out a hole or basin to accommodate structure keeping in mind that you will need enough space for the concrete block that supports the pipe.
- Place a concrete block with the top resting at the same elevation as the bottom of the weir.
- Slide the three-sided connector box through the outer track of the twin track weir.
- Fit the perforated pipe onto the three-sided steel connector box, making sure one row of holes is at the bottom, and pin it to stay secure.
- Chain the pipe onto the concrete blots blocks so the pipe couldn’t float away or move.
- Add the hog paneling or custom grate to pipe inlet to keep beavers from coming in.
