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Home My WebLink About20160299_re R-2536 Burial of Pipes on Jurisdictional Features_20160120Carpenter,Kristi From: Sent: To: Lauffer,@ilatthew� Wednesday,Danuary�0,�016[].2:21�M Wilson,6ravis@1/.;@1/anucha,�ave Cc: GaryDordan;@1/illiams,CAndrew[��AW Subject: RE:�'.-2536�urial�f�ipesC�nDurisdictional�eatures Thanks Travis. Points well taken. No assumed new de facto on this end. 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 '�.��°��`1� �.+�,`&�� .��: Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third pa►ties. Facebook Twitter YouTube From: Wilson, Travis W. Sent: Wednesday, January 20, 2016 11:42 AM To: Lauffer, Matthew S; Wanucha, Dave Cc: Gary Jordan; Williams, Andrew E SAW Subject: RE: R-2536 Burial of Pipes on Jurisdictional Features This looks like a good accurate summary of what we have discussed. As you highlighted, these decisions were based on discussions for R-2536 only. There are a lot of variables across the state to consider when assessing passage and stream stability through a hydraulic structure. In the case of R-2536 I think we tried to implement (or not implement) design and construction criteria based on what we have seen in the field over the course of many years. These same recommendations may or may not be appropriate at other sites. Between length, slope, and structure size I think we can all agree that culvert burial is a practice that doesn't make since everywhere. We have tried a few times over the years to discuss a more comprehensive criteria to help implement those decisions, but ultimately I think we wear down discussing the seemingly endless variables and default to case by case. And that works, we just need to make sure we don't begin to move forward with new de facto guidelines that are based off decisions from one project. Travis From: Lauffer, Matthew S Sent: Tuesday, January 19, 2016 3:51 PM To: Wanucha, Dave; Wilson, Travis W. Cc: Gary Jordan; Williams, Andrew E SAW Subject: RE: R-2536 Burial of Pipes on ]urisdictional Features Thanks Dave. Conditions: Pipes on JS streams do not need to be buried if either of the following are true: 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. If stream is intermittent then burial not required. Matthew (Matt) Lauffer, PE, CPM Assistant State Hydraulics Engineer Hydraulics Unit Department of Transportation 919 707 6703 office 919 621 0443 mobile mslauffer(a�ncdot.qov 1590 Mail Service Center Raleigh, NC 27699-1590 1020 Birch Ridge Dr. Raleigh, NC 27610 •��'��1��'�i��"I�s�� .-� Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third pa►ties. Facebook Twitter YouTube From: Wanucha, Dave Sent: Tuesday, January 19, 2016 2:16 PM To: Lauffer, Matthew S; Wilson, Travis W. Cc: Gary Jordan; Williams, Andrew E SAW Subject: RE: R-2536 Burial of Pipes on Jurisdictional Features Thanks for the follow-up Matt. It may be a good idea to include a condition 3 related to burial - that is, if a stream is intermittent, burial is not required. Dave W Dave Wanucha Division of Water Resources Transportation Permitting Unit NC Department of Environmental Quality 336-776-9703 office 336-403-5655 mobile Dave.Wanucha(a�ncdenr.qov NC DEQ Winston Salem Regional Office 450 West Hanes Mill Road, Suite 300 Winston Salem, NC 27105 ��.��#��r�� rc��.� ��.� Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Lauffer, Matthew S Sent: Friday, January 15, 2016 6:47 PM To: Wilson, Travis W. <travis.wilson@ncwildlife.or�> Cc: Gary Jordan <�ary jordan@fws.�ov>; Wanucha, Dave <dave.wanucha@ncdenr.�ov>; Williams, Andrew E SAW <Andrew.E.Williams2@usace.army.mil> Subject: R-2536 Burial of Pipes on Jurisdictional Features Importance: High Hi Travis, 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. 2. 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 Velocit}r - Double click in plat for optian� �� I]��t�� .-�o r'��-��a�� '�l��i�, o � ir� i� �o A+�°erage'Jelocit�r �fps� 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. 4 ',� � �;:.. � �. "r.. � i -. Fai;rrrTF.�W � } . ' � '�"" 5E£ GETRL I p�� A:iU 6 LL+v fi.`1�.s +l '� R _..��+ . � 0 � *_ kcs- L5F =�f .n�'= lC}_ 6 IIIG . �� J��P�4`_ �, J�'� � =�p�'� j5 g5 :.s��,��'�� 5 I � �� .._,��ti,}�r �� -�'_��, .. -' a�+. � _ -P•�`.'�`_ � �r' �'�—'� ,�'r`� �ITE �� L a sEF ir�sEr °� � 6 . -� � � �' � � � �� `� . ��.�,��i��►��. �� irX �e.,��ll . 5c�: � ail hr et�: .:�'t+Tl tl�e�s GII'.F7 .. �.i � oi i..� u . :.I:.•.:;:n'IJ �FSE LII'L-'. .,� ::f�h,;,.5 �.�,TEP�: �:`sE ='17i_� s�! U[Ibl.'' �ITE ��B 1"•1"7�K 1 IA'�RFI MS1' FSI�CFI 5[c Cir7+U{ g � 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. :� � ':� � ro � � �� _ � -•-'`rT'` �'i �Jy` +��f d' ��-- `� C�, " . -.... + Yr ' � •5 s ---5___ �_ � i-., � � � �� ', i� S �� r ��+`�; _; . � � � .A. kYrl _..,_p _ �' � 'ti. �i ::eia�. � � _� - � � .I �., � - _� f ti. �� - }� ;:�I.". � �ti '\�—�._ i•5EE �+Il E. . . �� -� --,� �� SEE � � L.+—[i — � ' 15€T C � � ._ . � � � ~� c� �II ""' v��l. �' _ � �ITE �,� i 6 �� 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(c�ncdot.gov 1590 Mail Service Center Raleigh, NC 27699-1590 1020 Birch Ridge Dr. Raleigh, NC 27610 T°��<��'�i��'�� , �`�i ��E�`�S � �n Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. 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