HomeMy WebLinkAbout20160299_R-2536 Burial of Pipes on Jurisdictional Features (2)_20160115Carpenter,Kristi
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Hi Travis,
Lauffer,@ilatthew�
Friday,DanuaryQ.5,�016[�:47�M
Wilson,6ravisLD1/.
GaryDordan;LD1/anucha,�ave;LD1/illiams,C6�ndrew[�[�AW
R-2536�urial�f�ipes�n�urisdictional�eatures
High
I wanted to follow-up with you regarding discussions yesterday during the 4C meeting for Section 2 and burial
requirements. There has been discussions about burial and if it is necessary if aquatic passage is not viable due to length
and slope and the possibility that material will not stay in the pipe or culvert due to the slope. While there is a need for
additional quantification of this topic, the following are recommendations for R-2536 only based on existing guidelines
and discussions to date. Please provide comments. Thanks for your response.
Proposed:
Pipes on JS streams do not need to be buried if either of the following are true:
1. If the pipe is greater than 250' in length.
If the pipe is on greater than a 3% slope. Velocity in a 36" pipe on a 3% slope is about 10 fps at 0.5 feet of
depth. Depth vs Velocity of a 36" pipe is shown below.
The plans will say "Pipe not Buried" on the pipe where JS features enter a pipe with either of the above conditions.
Pipes that are buried will have a sill incorporated into the headwall to provide stability for the upstream section.
Depth vs, Average Velocitkr - Double click in plat for optian� ���
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Culverts on JS streams do not need to be buried or backfilled if slope is greater than 4%
If culverts greater than 4% are buried, then sills are required on both ends of the culvert.
All other culverts will follow the Hvdraulics Unit Guidelines on Sills and Baffles
Examples on R-2536 that came up at the meeting that need your concurrence include:
Site 43C
54" Pipe over 390 feet would not be buried.
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Site 33
54" Pipe over 400 Feet long will not be buried.
Site 35
6X7 RCBC on 4.89% slope will not be backfilled and will have sills if buried a foot.
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Regards,
Matt
Matthew (Matt) Lauffer, PE, CPM
Assistant State Hydraulics Engineer
Hydraulics Unit
Department of Transportation
919 707 6703 office
919 621 0443 mobile
mslauffer@ncdot.gov
1590 Mail Service Center
Raleigh, NC 27699-1590
1020 Birch Ridge Dr.
Raleigh, NC 27610
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