20181666 Ver 1_Watauga #278 CSR_20181210

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ADDITIONAL INFORMATION AND COIv�PUTATIONS
SITE DATA
Drainage Area ...........8.49.54..MI ............. Source .USGS.Str.eamStafs........---..............................
River Basin .Nevw.. River ......................... _.. Character ..RURAI,.... _. _ _.............. _.........................
Stream Classification (Such as Trout, High Quality Water, etc.) WS-1Y. Wate.c.SuppJy,.Trnuf.lN.aters .....
Data on Existing Structure IIMBPR.FI.QQR.QN.J-BEAMS,AB.UIMEI�IT5:.T1klRER.CAPS/f1M$ER.FQSI.&..C.QNC.
SILLS, BRIDGE LENGTH = 46 FT.
Total Waterway Opening .....347.(1... s.f. Waterway Opening Below 100yr. WS EL....347.0.... s.f.
Debris Potential: Low Q'Moderate ❑ High ❑
Data on Structures Up and Down Stream .U.PS.T.REAM:.Gulxert.3..@...1J.'Xl.l'.;.US.3.27..atMystery...HiJI........
D4WI�iS7REAM:.BRG.. #44Q0.30..3. @12'X12. RCB..YJLINJNGWALLS ....................................... _ ........
Gage Station No..03479.000..-..�Katquga..Rjver Period of Records ..................... 77....................yrs.
Max. Discharge...........28..Q0.0.........c.f.s Date....luly.l.91b ............... Frequency.......hl/A...........
Historical Flood Information:
No knowledge of overtopping Period of
Date.........,,. Elev._.__....ft.Est. Freq. ........yr. Source ..D.avid.Wayne, N�RQT Bridge.._Knowledge...,_.yrs.
Maintenance �ngineer Period of
Date.........._ Elev.......... ft.Est. Freq. ........yr. 5ource .................._......_...._.__... Knowled9e.......yrs.
Allowable HW Elev. .... �Q�Q�Y3�E�I6IIAT R5�0 SDIgTIQNS..... ft. Normal Water Surface Elev. ....3305.8..... ft.
Manning's n: Left O.B.Q..075-0._7.60Channel .Q,035- Right O.B. Q..075-. Obtained From .... FEMA.FIS....
0.058 0.160
Flood Study/Status Redelineated..FIS,.Recemher.3,20.09............ Floodway Established? ..Yes.
With Without
Flood Study 100 yr. Discharge ..5,4.Z9.�.f.s.; WS Elev.: Floodway 3322.5{t. Floodway 3.321.4ft
@River Station ? 19528 "T"
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CULVERT SURVEY & HYDRAULIC DESIGN REPORT f�jq(,%
N. C. DEPARTMENT OF TRANSPORTATION ��
� DIVISION OF HIGHWAYS �'} ���I�
HYDRAULICS UNIT r1k
RALEIGH, N. C.
.IISCS RECRESSION E�t1ATIONS .................................................FFMA DISC'HARC;ES
SOURCE; "MAGNITUDE_ AND.. FREQUENCY_ OF. RURAL .............. ...... ...Q1Q _=...2,533.. CF.S.... _..........
FLOODS IN 1FiE SOUTHE,ASTERN UNITED ST,4TES,
THROUGH 2O06 VOLUME 2, NORTH CAROLINA. USGS Q50 .=...4,509. CFS .............
SCfENTI�IC INV�SYIGA710N5 RE}�OR 2 0-5158."
Q100.. =...5,479 CFS
HYDROLOGIC REGION #2
Q500 = 8,674 CFS
Q2...=... 717.. CF� ............................................. ......................... ..................................... .
45..=...7,268.CFS ............................._...._..__.....- -_.._._..._.................... - - --..._
Q70...:...7,693. CFS ..................................................................................
Q25 = 2,274 CFS
Q50 = 2,697 CFS
Q700 = 3,203 CFS
Q500 = 4,322 CFS
USGS REGRESSION EQUATIONS USED FOR DESIGN.
_.........__..... _....
FEMA DISCHARGES USED FOR COMPLIANCE.
_. _ ...................... _ .. _ - . _ . _ ............................................................................ _ .. _ ..
WATERWAY nPENWG 6ELC�W 100YR WCEL ..........................._.._.........................._..............
�XISTI.t�IG ..STRU�TURE..QY�RT.QPS . pN. _I.EF.T. OVE.RBANK. AREA..QF. W �1R . F.LQ1M:. 39Z.2..S.E.. _ ...... _ _ _ ..
DESIGN DATA
Hydrological Method ..QLSCHARGE5.7AKEN . FRQM.. FEMA FIS..AND ..RE.GIONAL.RECzRESS.IOJ�I Efi.UAT10N.5
Hydraulic Design MeThod HEG-RAS..Yersion 5.0.8
Design Tailwater � Q�a .. WA.... ft.; Qz5 t�UA.. ft.; QSp...[�l/A ft.;Q�oo ..WA ft.; Qsao WA ...ft.
InIeT Control Outlet Control
4 H.W. dc+D H.W. Remarks
Size & Type (c.f.s.) Ke HWiD (fr.) dc 2 ho H �So (ff)
3@ 14' x 12' RCBC
E EC— S M D L
........ ......... ......... .. _ ..... ............... ....... . . ..... ........ ......... ......... ..............
Is a Floodway Revision Required? ......MQA.IYPE.1....... Total Proposed Waterway Opening.......420.......s.f.
...................................................................."""".........................................................
Outlet Velocity (V�o) ............ 1,�,0............f.p.s. Natural Channel Velocity (V�o) .............q,3............ f.p.s.
_ .............. _ ............................ _ ...... _ ...........
Required Outlet Protection .........GLASS..II. RIP.RAP ......................................................................
_ ................................ _ .... _ ........... _ ...
INFORMATION TO BE SHOWN ON PLANS
_._ ..................__....._............................................................................__.......... WS Eev.Ta en @ River$tation ? 18854
Design: Discharge .... ]26.8..... c.f.s. Frequency ..........5..........yr. Elev. ..........3310..4......... ft.
BaseFlood: Discharge..__32A3.....c.f.s. Frequency...__..10A._._...yr. Elev. _.._....3313..5.........ft.
Overtopping: Discharge ....7.69.3..... c.f.s. Frequency.........].0..........yr. Elev. ..........3317.6..........ft.
* Overtopping occurs at-L- Sta.14+80 on the centerline.
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fi I.D. No....SF.94A27fl.. ProjectNo. .........]ZBP_1.1..R182.._.... Proj. Station ...._..Sta.7b+b2..Q0........
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oCounty ........Y�[ATAUGA....... Stream .....................MIDDLE.F.QRK..................... Stru. No..94.027$.
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LLOn Highway..........S.R-154.0.._....._ Between ..._...NC-321....... and ...TYJEEISIE..RAIL.R.OAU..LANE...
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� Recommended Structure
°? 3 . .Q. . .1.4.'. x 12' . REIN FORCE Q . .CQN CRETE.. B.OX. .CULYERT, .6". .TO F . BEYEL. . ... . .
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�� ..3.5.'.S.ILL.ON..LEF.T.CULYERT,.1'.SI1L.�N...C.ENTER,2.'.SILL.ON..RI.GHT.CULVERT .................................
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� Recommended Width of Roadway._45:.(paxed.shoulde.r.ffl.paved.shoulder.)... Skew .......88..D.EGREES......
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Recommended Location is (Up,At, own Stream from Existing Crossing......._�3.5'.RQINN.STREAM.......
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,� Latitude ...........3.6.16.411z9........... Longitude ....___.-81,646.682..........
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� Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier Cv]�
� Bench Mark is
r- RAII ROAR ..;SPIKE..I.t�l ..1,5'.QAK .TREE ................ ............................... . ....... ........
� ........................STA.]Z.f.Oh..84..O.FFSEI.201.18.31.(R).. Elev. ...332.1...49.'..fr. Datum:.....NAYD..88....
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Temporary Crossing ......bIQT.RE.Q�IIREC?..l1.TlLlZE.EXISTING_.CRQS.SWG..QIlRING..CO.r1S7RUCTIQ[�1.......
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� Des�gned by: C..KIEPER,P.E.-.IIkYMONS.GROIJP............
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� Assisted by: S..R4RAN,P.E.-.IIMMONS.GROUP...........
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Date .._.g!1Q2418.....
ProjectEngineer : gECKY.MEYER,.PE...-.TIMMQNS..GRQUF..
� Reviewed by: SHEILA..S.REEYES,.PE,.CFM. -.71MMON5..c� RA LIP..
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