20170364 Ver 1_Bridge 145 Yancey SMP_20170329

Hi$hWBY North Carolina Department of Transportation �
�•••�„�� Highway Stormwater Program ,�
STORMWATER MANAGEMENT PLAN �~�``�^-`°
(Verslon 2.04; Released November2015) FOR NCDOT PROJECTS
WBS Element: 17.BP.13R.80 TIP No.: 990145 Coun (ies : Yance Pa e 3 of 3
Britlge to CulveR Avoidance and Minimization
Pro ed Structure Summa
Sheet No. & Station Sheet No.: 4 Station: '13+07.7 Number of Barrels: 1
Draina e Area ac or sq mi�: 0.87 Sq. Miles Barrel Width/Diame[er ft): 12
Surface Water Bod : (1)McKinne Branch Barrel Hei ht ft: 5
Culvert T e: RCBC Culvert Len th ft 57
Avoidance and Minimization Efforts: Bridge Replacement of Structure 990145 with a 12' z 5' RCBC. 20 LF of downstream and 25 LF of upstream channel improvements are proposed.
(Bridge to Culvert) Artnoring the banks will be minimize erosion. Two 48" CSP will be used for the temporary detour. Proposed low flow channel will maintain existing
channel geometry. Altemating sills and baffles will be utilized.
Stream Slo e Fish and/or A uatic Life Passa e
Existin Avera e Stream Slo e%: 3.80 % Existing Low Flow Channel Dimensions 3' - 4' Wide (WE to WE); Normal Depth = 0.5';
Proposed CulveR Slo e%): 3.80 % in the Stream: Banks = 3' - 4' High with 2:1 SS
CulveR Burial
Pro osed Culvert Burial De th ft): 1.5
Ezisting Streambed Material: Silt and Cobbles Proposed Low Flow Dimensions 6' wide: L5' High
Through the Culvert:
Proposed SiIis/BafFles: Low Flow 1.5' sills to be placed 1' inside inlet and
outlet barrel with bafFles alternating every 10'. (See ��sting Low Flow Velocities in the
Detail A). High Flow 2.0' sill to be placed 1' inside inlet Stream ft/s : 4
antl outlet barrel. ropose ow ow e ocities roug
the Culvert (Ws : 4
Alternating Low Fiow Silis/Baffles: Yes
CulverVStreamAli nment
Stream Pattems Upstream and Stream runs parallel to road embankment upstream and downstream
Downstream of the Cuivert that Could
Affect Fish Passage and Bank Stability:
Bed Forms Impacted by Culvert (riffles, N/A
pools, glitles, etc.):
Low Flow Floodplain Bench Required? No
(provide justification)
Sharp Bends at Inlet/Outlet? Yes Stream runs parallel to Road Upstream & Downstream
(describe culvert alignment with stream)
Stream Realignment Necessary? (provide No
justification)
Bank Stabilization: Bank stabilization required 25 LF upstream & 20 LF downstream
Dutlet Velocities
Naturel Stream Channel 2- r Veloci ft/s): 6.4 Natural Stream Channel �0- r Veloci fr/s : 8.1
Proposed Culvert 2- r Outlet Veloci (ft/s : 4.1 Proposed Culvert 10- r Outlet Veloci (Pos : 7.1
Roadwa Geometric Considerations
EvaluatelDescribe Roadwa Geometric Constraints:
Combination of topographic constraints and existing building loration upstream limited the roadway and culvert design.

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Hj�yyy NorN Camlina Department of Transportation .��
�..._,,. Highway Stormwater Program x�
STORMWATER MANAGEMENT PLAN �� _. �"
(Verslan 2.Oa; Rebasetl Novamber ims� FOR NCDpT PROJECTS
WBSElement �7.BP.�3.R.80 TIPNo.: 990�a5 Coun ies: Yance Pa e 1 of 3
Gerreral Pro ect Iniormation
WBSElement: �7.8P.�3.R.80 TIPNumber: 990'I45 ProectT e: Britl eReplacement Date: 12l7/2015
NCDOT Contact: Ro er B an Contractor / Desi ner: Moffatt & Nichol�. CC�.Leah Voun
Adtlres5:550rdngeStreet Atltlress �5'16EastMi116:ookRtl
Asheville, NC 28801 Raleigh, NC 27609
Phone: a28251-6�7� Phone: 9�978t�626
EmaiL rdb ran nWot. ov Email: I oun moffattnichoLwm
Li /Town: Bumsville Coun ies : Yance
River Basin s: French Broad CAMA Coun � No
Wetlands within Project Limits? No
Pro"ectDescri 'on
Pro'ec[ Len h lin. miles or feet : 0.06 mi Surrountlin Lantl Use: Rurdl; AgricWtural; Forestetl
Pro Pro ect F�isUn Site
Pro ect Bui14U on Area ac. 0.1 ac. 0.'I ac.
Typicai Cross Section Description: 9' Travel Lane with 2' Pavetl Shouider 9' Travel Lane wfth Grass Shoulder
Annual Avg Daily Traffic (veh/hdday): Desi nlFuture: �40 Vear 2020 Existin : 140 Veac 2�'IO
Generol Project Narative: Britlge Replacement of Stmcture 990145 with a'12' x 5' RCBC. 20 LF of tlownstream and 25 LF of upstream channel improvements are proposed- Armonng the banks will be
(Description of Minimization of Water minimize erosion. Two 48" CSP wili be usetl for the temporery detour
�ualiry Impacts)
� . . . . .. W . . . {nformation . . .. . .
Surtace Water 9otl 7�: MCKinne Branch NCDWR Stream Intlex No.: 7-2-71
NCDWR Surtace Water Classification for Water eotly Prima Classification: Class C
Su lemental Classi£cation: Trout Waters (Tr
O[her Stream Classification: None
Im airments: None
A uatic T&E 5 ecies? No Comments:
NRTR Stream ID: Buffer Rules in Effect: N/A
Pro ect Includes Brid e S annin Water Bod ? Yes Deck Drains �ischar e Over BuffeR N/A Dissi ator Patls Provitletl in BuffeR N/A
Deck Drains Dischar e Over Water Bod ? No Qf yes, provide justifcation in the Generel Project Narrative) Qf yes, tlescribe in the General Projec[ Nanative; if no, justify in the
(N yes, provitle justifcatlon in the General Projec[ Nartative) General Project Narrative)