20160299_Re Embedded Rip Rap for outlet protection_20160210

Carpenter,Kristi
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Matt,
Jordan, Gary <gary�[e-mail]>
Wednesday, February 10, 2016 8:50 AM
Lauffer, Matthew S
Wilson, Travis W.; Wanucha, Dave; Elam, William H
Re: Embedded Rip Rap for outlet protection
I have no problems with this proposal. Thanks.
Gary Jordan
Fish and Wildlife Biologist
Liaison to NCDOT
US Fish and Wildlife Service
P.O. Box 33726
Raleigh, NC 27636-3726
Phone: [phone] x.32
Email: gary iordan(a�fws.gov
On Tue, Feb 9, 2016 at 3:10 PM, Lauffer, Matthew S<mslauffer(c�r�,ncdot.gov> wrote:
Gentleman,
Culvert C350 on R-2536 is an approximately 300 ft culvert at 4.89% slope that will be buried and discharging
into UT to North Prong Richland Creek During the 4C, we agreed that the aquatic passage was not viable. To
protect the downstream channel bed from the 20 ft/sec velocities, we would like to imbed Class II rip-rap flush
with the channel bed from the 20 ft/sec velocities. This would be extra protection for the larger storms. With
the culvert buried as designed a lot of the momentum of the flow will be dissipated by the d/s sill for the
majority of the storms. I remember talking about embedding rip-rap on other sites, but did not remember if we
had discussed for this one.
Please let me know if you need more information.

Matt
Matthew (Matt) Lauffer, PE, CPM
Assistant State Hydraulics Engineer
Hydraulics Unit
Department of Transportation
919 707 6703 office
919 621 0443 mobile
mslauffer(cancdot.qov
1590 Mail Service Center
Raleigh, NC 27699-1590
1020 Birch Ridge Dr.
Raleigh, NC 27610
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