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ADDITIONAL INFORMATION AND COMPUTATIONS SITE DATA
Drainage Area ............3.12..S.Q..MI ............. Source .US.GS.Strea.mSfats......................................... a
1SGS R R SSION � IATIONS......._ ......................._._..._...... F�MA DISC'HARGES....._.......... River Basin .[�Iew..River........_................... Character . RURAL,................................................. � CULVERT �. C. ATION REPORT y!��'������
SURVEY & HYDRAULIC DESIGN
� DEPARTMENT OF TRANSPORT � -'a
SOURCE:.':ES.l'IMATING..7H�.MAGNIT.UI�E..ANR..FREQU�NC.Y..QF.........Q10...:.. 709..CF5 ................... Stream Classification (Such as Trout, High Quality Water, etc.) Class.C,Trout Watars,H�gh..Quality..�^latsrs si DIVISION OF HIGHWAYS -�r'V��
FLOODS IN RURAL BASINS OF NORTH CAROLINA - REVISED." H T
USGS..WATER-RESOURCES..INVE$TIGATIONS.REPORT_01-4207,2001;,,_,Q50..=..J.,239..CFS ................ Data on Existing Structure .Ste.elpl.ank.fbszr..on.l-Benms,.Rainforced..cancrete..ab.utments,.Bridge_Leng}h=.33 ft. a YRALEGHSN.CN�
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Q10_ _. _ 710.. CFS...... _.. _ Q100 = 1,516 CFS Total Waterway Opening .....16.6.5_.. s.f. Woterway Opening Below 100yr. WS EL....166:5......s.f. �
_
Q500 - 2,307 CFS Debris Potential: LowC�Moderate❑ High❑ � I.D. No....S.F-Q4Q023... ProjeUNo. .........]ZBP_11...R.182........ Proj. Station .._.....Sfa.]2.f.47.5.0........
Q25..= ...992..CFS ............................................................................................................ Oi
Data on Strudures Up and Down Stream __„�pstream;.RTE,9.877A.,(E.S.treetJ.Bridge..l.@...24-FT._...... M
�' Q50 _=___7,240 CFS r County ...........ASHE........... Stream._ .............ALD..EIELD..BRAt�1CH.................Stru. No..04.OQ23.
_ ..........................__........_.................._.................................. � o
: _ . _ _ .. _ ...D.ownstr.eam:..CQnflusnce. with.. Big . Har.se..Cr.eek. . . . ..... _ ............. _ ....... _ ........................ o Q
Q100 = 1,518 CFS n Highway.......NC794iU.S221....... Between .......E..S7REET.._.. and .._..........p_STREEi ..............
................................................................ _..._.............................. . � LL; I
.........................
_.._ ......................................_......................._._......,......._............ Gage Station No.0.31b.1.00.0_(.Sout.h.Fork.New River) Period of Records ,.....................94...___...........yrs. „�
Q500 = 2,309 CFS �i Recommended Structure .3..@_..1Q'.x..4'.REINF4RCED_CQNCRETE..BOX..C.ULYERT.WLb°..TOF.B.EYEL......_.
_.....
Max. Discharge_____-_.b2.,80.0._._.___c.fs Date__Aug..]4,1.4A0.......... Frequency..._..[�l/A........... o
n� .............CEt�1TER.CULYERT.WITH..6-LI�1C.H_SLLL,.LEETiRIGHT.CULYERTS..IMIH...QNE-FQOT.SJIJ..........._.
Historical Flood Information: M
No record ofbridge overtopping Chad Cox,Bridge Maintenance Period of o Recommended Width ofRoadway..30'.(paved..shQuld.er.to..pave.d.shQuld.er�... Skew __._89..D.EGREES_..._
-.- ........................ . - -- Date..........._ Elev.......... k.Est. Fre r. Source ' Knowled e.25... rs. o Recommended Location is U At Down Stream from Existm Crossin
q. -..- .Y Supsrvisor,.NCDQ7...-.f�ivision.11.. 9 Y '
Period of � F� ) 9 9• _.AT..EXISTING..CRQSSIN.G.. I
_ .........................__......_...................._....................................................................... Date......_.... Elev.......... ft.Est. Fre r. Source ..........._..........................._Knowled e........ "'
q. _ _ ....y 9 yrs.
LL
__..........._..._._._ .........................._..._...................... p� ,� Latitude ........._35.499291._........ Longitude ......._.-8L�713.05...........
"" "' "' Allowable HW Elev. ���EVR2657 7' qT RSEC�3�D..EF.FECTIYE. fF. Normal Water Surface Elev. _..2648,3..... ft. o '
- Mannin 's n: Left0.6. Q.A20-.. Channel..p�047. Ri ht0.6. 0..02.0-. Obtained From .._ FEME�.F1S... N Statewide Tier ❑ Re ionalTier
g g � g' � Sub-Regional Tier ❑
0.140 0.740 Non-Encroachment 'J
_._ ........................._._._.__..............._.................................._................................. Flood Study/Status Limife.d..D.etailed.FJS,.Novemb.er..4,2.OQ4.......... Established?
YE.S. � Bench Mark is ..CHISELED..SQllARE.IN..S.QU.THINESI.EDGE.OF.CflL1NCRETE.WALL ...........................
Revised 12/32009 With Without a=
- Flood Study 100 yr. Discharge ..1,576..c.f.s.; WS Elev.: Non-Encroachment2b56..4 ft.Non-encroachment265.6.4ft. �..........._..._.......S7A.l7.�J2.0.3, OFFSET.23.21b]_(L)._ Elev. ..26.6L1�44'..ft. Datum:.....NAYD..fl8....
�! @River Station ? 232 � Tem ora Crossin
, _.._ .............................................._...................._......................................... DESIGN DATA p rY 9........................ -__ _.. ....NQT REQIlI.RED....................._._...._____.... I
Hydrological Method ....... .......... FEMA..Risch.arg.es. .........
Hydraulic Design Method ..... H.EC-RAS.Yersion..5.0..3 .........
Design Tailwater � q WA....ft.; Q J�VA.. ft.; Q.. PVA ft.;Q WA ft.; Q WA ... ft.
10 ' 25 50 100 "" 500
Inlet ConTrol pu}let Con}rol
Q H.W. dc+D ry,y./, Remarks
Size & Type (c.f.s.) Ke HWiD (ff.) dc 2 ho H �So (ft)
3@ 10' x 9' RCBC
E EC— S M D L
Is a Floodway Revision Required2 _ MOA Type 2e_ ____. Total Proposed Waterway Opening 245 s.f.
Max increase 0.5' @ RS 156
O�tlet Velocity (V�p) ..... 3..3 f.p.s. Natural Channel Velocity (V�o) ........ 6.7.... f.p.s.
Required OutletProtection ....._....Class.Il.Riprap._.
INFORMATION TO BE SHOWN ON PLANS
WS E ev. Ta en @ River Station ? 232
Design: Discharge .... ]23.4..... c.f.s. Frequency ........ 50..........yr. Elev. .........2.656.3.'......... ft.
Base Flood: Discharge .....157.6..... c.f.s. Frequency .........10.0.........yr. Elev. .........2.6�6.7'......... it.
Overtopping: Discharge ....23A7..... c.fs. Frequency.........500........,yc Elev. __._..2657.9:_......}t.
* Overfopping occurs at-L- $ta.12+79 on the centerline
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-a Designed by: C..KIEFER,PE.-.TIMMONS.GR011P............ ;:
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"= Assisted by: &.. R4RAN, P.E.-. TIMMONS.GR011P......... _ ` ` �''
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Date .....7113!LO].8... {,ya ,,,:..
� Project Engineer : $ECKY .MEXER,.PE. -.TIMM4N5_GRQU.F...... r •" ' "`'
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� Reviewed by: SH.EUA..S.REE.V.ES,.PE,.CFM...-.TIMMQNS..G QtlP. ; ;�;�t.
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