20180067 Ver 1_Mitigation Information_20220715

From: Davis, Erin B
To: Baker, Caroline D
Subject: FW: [External] FW: Puncheon Fork Flexi Baffles
Date: Tuesday, July 19, 2022 11:45:55 AM
Attachments: Flexi Baffle Product Data v210524.odf
Flexi Baffle Installation Instructions v200514.odf
Laserfiche Upload: Email & Attachments
DW R#: 20180067 v.1
Doc Type: Mitigation Information
From: Kichefski, Steven L CIV USARMY CESAW (USA) <Steven.L.Kichefski @usace.army.mil>
Sent: Friday, July 15, 2022 2:00 PM
To: Tugwell, Todd J CIV USARMY CESAW (US)<[e-mail]>; Kim Browning
<[e-mail]>; Haywood, Casey M CIV MVP
<[e-mail]>
Cc: Davis, Erin B <[e-mail]>; Leslie, Andrea J <[e-mail]>
Subject: [External] FW: Puncheon Fork Flexi Baffles
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FYI ... RES is going to try retrofitting a concrete culvert at Puncheon Fork that is not maintaining
substrate or allowing aquatic life passage with this product. DOT has added baffles to culverts over
the years, but typically larger ones (>60"). This is on a 48" pipe and I have not seen it used before, so
it will be interesting to assess.
Regards,
Steve Kichefski
Regulatory Project Manager
U.S. Army Corps of Engineers
Wilmington District, Asheville Field Office
151 Patton Avenue, Suite 208
Asheville, NC 28801
(828)-271-7980 Ext. 4234
(828)-933-8032 cell
The Wilmington District is committed to providing the highest level of support to the public. To help
us ensure we continue to do so, please complete the Customer Satisfaction Survey located at our
website at https://regulatory.ops.usace.army.mil/customer-service-survey_( to complete the survey
online.

From: Ryan Medric <rmedricPres.us>
Sent: Thursday, July 14, 2022 3:07 PM
To: Kichefski, Steven L CIV USARMY CESAW (USA) <Steven.L.Kichefski(@usace.army.mil>; Andrea
Leslie<andrea.leslie(@ncwildlife.org>; Davis, Erin B <erin.davisCCDncdenr.gov>
Cc: Bradley Breslow <bbreslowCcDres.us>; Benton Carroll <bcarroll(@res.us>
Subject: [URL Verdict: Neutral][Non-DoD Source] Puncheon Fork Flexi Baffles
All,
Thanks again for meeting with us earlier today. As discussed, RES will proceed with ordering and installing flexi
baffles in the concrete culvert on Reach JN4-B to reduce water velocity, interrupt laminar flow, and improve
aquatic passage.
According to the product datasheet, they can be installed in concrete, steel, galanzied, and HDPE (plastic)
culverts. Additionally, the website says they have a "20+ year warranty" but doesn't specifically state a lifespan.
Attached are some reference materials and the YouTube link to the video I shared on Zoom is here:
httl2s://www.youtube.com/watch?v=lpOk3HaAfA4
Let us know if there is anything else you need for the Year 1 credit release and we will keep you all updated on
our progress with the flexi baffles.
Thanks,
Ryan Medric
Project Manager
RES I res.us
D: 919.741.62681 M: 703.424.6313

Installation Instructions for the Flexi Baffle
If installing in a CMP, plastic or similar culvert use galvanized 1-1/2
inch self tapping screws over a galvanized 1-inch washer.
If installing in a concrete culvert use galvanized 1-1/2 inch sleeve
anchors over a galvanized 1-inch washer.
Installation Instructions:
1. Place the center of the Flexi Baffle parallel to the bottom of the culvert.
2. Secure the center of the Flexi Baffle then turn it perpendicular to the water flow. See
Figure 1 for the proper Flexi Baffle orientation.
3. Secure the Flexi Baffle every 6 to 8 inches with the last fastener within 2 inches of the
end of the baffle.
4. To see a video demonstrating Flexi Baffle installation, cut and paste this link below to
your browser:
https://youtu.be/KMvMfIluF8U
Figure 1. Flexi Baffle Orientation
FLOW

The Flexi-Baffle is designed to reconnect aquatic habitat above and below a passage barrier. The
Flexi-Baffle creates hydraulic conditions within a culvert that allows both strong and weak
swimming fish and other aquatic organisms to pass upstream. The flexible baffle material allows
the the weir to lay down at higher flows to preserve the hydraulic capacity of the culvert and reduce
the incidence of capturing debris. When flows drop, the Flexi-Baffle reorients itself to create a fish
ladder in your culvert. The Flexi-Baffle can be easily installed prior to new culvert installation or be
used to retrofit to existing structures.
Almost 1,000 Flexi-Baffle installations have been established over the last 10 years for a variety
of fish and other aquatic species. Let our fish passage experts help design a solution for your
barrier.
Features (At -a -Glance)
• Reduces water velocity and interrupts laminar flow to improve fish
passage conditions
• Can be installed in concrete, steel, galvanized or HDPE culverts
• Constructed from rugged, non -toxic polymer
• Height is 6-inches/150mm.
• Length can be customized to your application
• Can be customized to fit any size and shape of culvert
• Can be quickly installed with common hand tools
2.00inches/50mm
Patent Pending