20170353 Ver 1_Bridge 133 Yancey SMP_20170328

HighW2V North�Carolina Department oF 7ransportation ..
,....,,. Highway Stormwater Prog2m ,7`�f :
STORMWATER MANAGEMENT PLAN
ryenion 204; ReMasetl Novembar 2016� FOR NCDOT GROJECTS
WBSElement: 17.BP.13.R.78 TIPNo.: 990�33 Coun ies: Yance Pa e i of 5
General Prqect Infortnation
WBSElement: �7.BP_13R78 TIPNumber: 990133 Pro'ectT e: Britl eRe lacement Date: 12r/201�
NCDOT Contact: Ro er B an Controctor/ Desi ner: MOHatt & Nichol�, CCLeah Younc
Atltlress: 55 Orange Street Atltlress � 61 u East Millbrook Rtl
Asheville. NC 28801 Raleigh, NC 27609
Phone: 828 25b6171 Phone: 979 78ta626
Email: rdb ran ncdol. ov Email: I oun moffattnichol.com
C/Town: Bumsville Coun ies : vance
RiVer Basin 5: French Broatl CAMA COUn ? No
Wetlands within Prqect Limits? No
Pro'ect Destti tion
Pro ect len th lin. miles orfeet : 0.06 mi Surrountlin Lantl Use: Rural; Agrialturaf, Forestetl
Pro sed Pro'ect Existln Sita
Pro"eci Built-U on Area ac. 0.1 aa 0.� ac.
Typical Cross Section Description: 10' Travel Lane with 3' Paved Shoulder e' Travel Lane with Grass Shoulder
AnnualAvgDailyTraffic(veh/hrlday): Desi NFuture' d1Q Year:2020 Existin : 4t0 Yeac 2010
General Prqect Narrative: Bntlge Replacement of Structure 990� 33 with a DBL 11'x5' RCBC. 40 LF of dovmstream antl 30 LF of upSVeam channel improvements are proposed. Armoring the banks will �e
(Descnption of MinimizaUon of Water minimize erosion. Rock Cross Vanes will also be utifizetl.
QualiTy Impacts)
. .. � WaterEOA Informa8ort.
Surtace Water Botl 1: Cane Branch NCDWR Stream Intlex No.: 7-2-52-33-t0
NCDWR SurFace Water qassification for Water Body P�ima Classification: Class C
Su lemental Classifiwtion: Trout Waters r
OtherStreamClassiFication: None
Im airments: None
A uatic T&E S ecies? No Comments'.
NRTR Stream ID: Buffer Rules in Effect: N/A
Pro ect Inclutles Brid e S annin Water Bod ? Yes Deck Drains Dischar e Over BuffeR N/A Dissi ator Pads Providetl in Buffer? N/A
Deck Drains Dischar e Over Water Bod ? No (�f yes, provide justifcalion in the General Project Narative) Qf yes, tlescribe in the General Project Narrative; if no, justify in the
Qf yes, provitle justiication in the Generol Projed Narrative) General Project Narrative)

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t{�yya North Carolina Department of TransportaGon ,- t
,.....,,. Highway Stormwater Program `�3�
STORMWATER MANAGEMENT PLAN ' �'""""`�
(Version 2.06: Releasetl November 2015) FOR NCDOT PROJECTS
WBS Element: 17.BP.13.R7 TIP No.: 990133 Coon ies : Yance Pa e 5 of 5
Bridge to CulveR Avoidance and Minimization
Pro osed Structure Summa
Sheet No. & Station Sheet No.: 4 Station: 12+gg.0 Number of Barrels: 2
Draina e Area (ac or sq mi : 1.6 S- Miles Barrel Witlth/Diameter ft: 11
Surface Water Bod : (1)Cane Branch Barrel Hei ht ft: 5
CuiveR T e: RCBC C Wvert Len th ft 50
Avoidance and Minimization Efforts: Bridge Repiacement of Structure 990133 with a DBL 11'z5' RCBC. 40 LF of tlownstream and 30 LF of upstream channel improvements are
(Bridge to Culvert) proposed. Rock Cross Vanes will be used downstream. The existing strear� betl siope wjll be maintained. Proposed low flow channpl is�)milarly
sized ro existinq channel. Alternating sills/baffles will be used. (o L- F o� �^^ ��ci {� r�, roSS V�.+�CS � oc c.it
(�cyo.,d cFow.�S?-res�..n bo...k. Sk�.b:l',z�.+:on
Stream Slo Fish andlor A uafic Life Passa e
Existin Avera e Stream Slo e%: 3.80 °/ Existing Low Flow Channel Dimensions 5' - 70' Wide (WE to WE); Nortnal Depth = 0.5';
Proposed Culvert Slo e%: 3.80 °/ in the Stream: Left Bank is 1' - 2' High Upstream; Right Bank
Culvert Burial is 20' High Upstream: Downstream Banks are
Pro osed Culvert 8urial De th ft: 1.5
Existing Streambed Material: Siit and Cobbles Proposed Low Flow Dimensions 9' - 11' wide; 0.5' High
Through the Culvert:
Proposed SillslBafFles: Low Flow 1.5' sills to be placed 1' inside iniet and
outlet barrel with additional sill at centerline. High Existing Low Flow Velocities in the
Flow 2.0' sili to be placed 1' inside inlet and outlet Stream ft/s : 3
barrel wiih atlditional sill at centerline. ropose ow ow e ocities roug
the Culvert fUs : 3
Alternating Low Flow Sills/Baffles: Yes
Culvert/StreamAli nment
Stream Pattems Upstream and Property located on downstream left bank. Active erosion occurring. Bank to be heavily armored to maintain structural stability of existing building.
Downstream of the Culvert that Could
Affect Fish Passage and Bank Stability:
Bed Forms Impacted by Culvert (riffles, N/A
pools, glides, etc.):
Low Flow Floodplain Bench Required? No High Flow Bench provided
(provide justification)
Sharp Bends at InIeUOutlet? Yes Stream runs parallel to Road Upstream & Downstream
(describe culvert alignment with stream)
Stream Realignment Necessary? (provide No
justifiwtion)
Bank SUbii"vation: Bank stabilization required 30 LF upstream & 40 LF downs[ream
Outlet Velocities
Natural Stream Channel 2- r Veloci ft/s : 7.4 Naturel Stream Channel 10- r Veloci ft/s : 5
Proposed Culvert 2- r Outlet Veloci (ft/s): 3.2 Pro osed Culvert 10- r Outlet Veloci (ft/s : 4.5
Roadwa GeomeVic Conside2tions
EvaluatelDescrihe Roadwa Geometric Constraints:
Combination of topographic constraints and existing building location downstream limited the roadway antl culvert tlesign.