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INFORMATION TO BE SHOWN ON PLANS
WS EL. Taken @ River Station 2380
Design: Discharge ........89QO........c.f.s. Frequency .........50.........yr.
Base Flood : Discharge ... . .. . ]]Q00. .. ... . .c.f.s. Frequency ........100. , . , . , . ,yr,
E I ev. . . . . . . . .19.8 5. 6. . . . . . . . .ft.
E I ev. . . . . . . . .19.8 7. 0. . . . . . . . .ft .
Overtopping: Discharge ......�].4.00.Q......c.f.s. Frequency .......>.SQO.......yr. Elev. .........2.013..........ft.
OVERTOPPING OF WESTERN
ABUTMENT INTO ROADWAY
ADDITIONAL INFORMATION AND COMPUTATIONS
DA= 5.9..O..SQ. M1......... REGIQN . 2 ...........................................................................................
.US.GS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FEMA. . . . . . . . . . . . . . . .59.Q . SQ..MI... . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . Q. . . . .=.5�00.=.5,80� . �FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Q . . . . = 2.80.Q . CFS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
,o ,o
. . Q. . . . .=.8940.=.8.9.00 . �FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Q . . . . = 3.610. .CF.S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
50 50
. . Q. . . . .=.105.00.=.110Q0. .CF.S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Q . . . . = 3.9. 5.Q . CFS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ioo ioo
. . Q. . . . .=.14Q00.=.1.4Q00 . �FS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Q . . . . = .4.bbA . CFS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
500 500
...........:. US.E.I�SGS ..........................................�..................................................................
]QO..YR.C.O.N.T.RACT.IDN..SC�lJR .............................15�0. YR..CONTRA.CTIQN..SCQU.R.............................
...Y.. =.Y..-.Y............Y..=lb.b ................................1
s s o 0
. . .Y.2 -,(�Z./. �. . �d��Y� )�1N� !W z � .ea . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .Y.2 -.(] 0.7. 8.V] �3b.Q����1.7. .6) �52!�2 ) :64. _ ] 8..2 . . . . . . . . . . . . . . . . .
...Y.s -]8..32-1.6.6.:.1..b' .........................................
]Q0. .YR .L4�Al. .SC.O.UR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..X.=Y.[2.0.(K.)GK-�)�K.)(n!Y.�o.es�F �0.43.� ...................
S 7 7 2 3 1 R
..P1ER .7 .........................................................
. . X . = WS . E.L-BED. . EL.=.l9$.7..0-1.971..4.=.15.6 . . . . . . . . . . . . . . . . . �
.. F.,.= .V. �l9�GY..))�.=.1.1..3i.((32.2�(]].3.)) �.: .0.50 . .. .. .. .. .. .. .. .
R 1 1
0.65 0.43
.. X . =]5.6�2.0�1.0)�1..A).(].l)(.4.a!15.b�...(.50).... ] .............
s
. . X . =lQ.b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
s
..P.IER .2 .........................................................
. . Y . = WS . EL-BED. . EL=.1987. .0-1.985..Q = 2..Q . . . . . . . . . . . . . . . . . .I
t
.. F..=.V. ��9)�Y..))�.:2.N.�(�2.2)(2.0�) . =Q.25 ................
R 1 7
.. X . =2.0[2.Oj1.0)�1..Q).(l.l�(.4.0<2.O�o:es�.25)0.43. � ...............
S
..X . =�3..8 .......................................................
s
. Y..=.Y. -Y............Y...:.1.8.3 .................................
s z o 0
..i2.=.�.QzIQ.� ��7.�Y.�.�.�.W.,�.I.�.N.z.�.64 .............................
. .Y z.=.(.1.33]A✓.128,�3) ���19.3.)(521.52.)..e4 .=.1.9..Q . . . . . . . . . . . . . . . . . .
. Y s.=.14.9-1.8.3.=.1..1� . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5Q0. YR. .LQCAL. S.COUR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..Y..=.Y..[2..Q�K..)(K -�lK. �(c%Y..)o_es (F. �043. � ....................
S 1 7 2 3 7 R
..PI.ER.] ..........................................................
. Y. .=.�^lS. .EL-B.ED. . EL = ] 9.88.$-197.1...4 =17...4 . . . . . . . . . . . . . . . . .
. .F 1 =.V..��19)�Y..).)�.=.12.?J. (�32..2).(]2..2)� ..=.0.52 . .. .. .. .. .. .. .
R 7 1
. .Y. .=.17. .4�2..0(].0.) j1.0)�1...1)(4.(1!] 7..4). .65�.52).o.as .] . . . . . . . . . . . . . .
s
. Y..=.l1..1 ........................................................
s
..PI.ER. 2 .........................................................
. Y..=.NIS..EL-6.ED.. EL=79.88.8-148:5.0.=.3.8 ..................
1
. FR=.V.� �ld�)�Y���)�)��=.2.N. ((32..2).(3..�)� ..=.0.18 .................
. Y..=.3.8�2..0(7.0.)(1.0)Gl..l)(4.N.3..H)�.b �.18) 0:43 � ................
5
. Y..=.4.1 ........................................................
s
SITE DATA
DA@SELECT SITES & USGS QUAD (WHITTIER,
Drainage Area .. ... ..... ... �9..SQ. MI, ... .. . ..... ... Source ...S.Y.LYA. NORTH,. GRE.ENS. CR.EEK,.S.Y.LYA. �QU.T.Na. ..
River Basin _ ......... LITf.LE. T.EN�IESS.EE........... Character . . .. ........... RURAL,.MQU.N.T.AINS...... ... .. . .. ..
Stream Classification (Such as Trout, High Quality Water, etc.) ................'C':.Tr.(2-7.9-�9)................
Data on Existing Structure ..........1 cL�.67.',2@.62.5.',.1.@2.4,3',.]@..62.5.'.R.EINF.O.RCED.. CQt��RE.T.E.RE�K...........
...........................QN...CONTJNULlS.1-�EAMS........................... Total Waterway Opening .....4.4.b0......s.f.
Waterway Opening Below 100yr. WS EL. ... _..9.3Q ..... _s.f.
Debris Potential: Low .. X... Moderate ........ High ......
Data on Structures Up and Down Stream ...................UPS.T.REAM:. �.R. ]�81,.4@.1.4x12..R�BC...................
. . . . . . . . . . . RQWNS.T.REAM:. . . . .SR .15�8, .1.@5A'. T.IM�ER. .pE.CK . ON. . S.T.EEL.I-QEAM . ANR . .CONC. ARUT.MENTS. . . . . . . . . . . .
.....................................................................................................................................
MATCH OR REDUCE CORRECTED EFFECTIVE 100-YR ELEV=1987.5
Design Control Elev . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..ft.
Gage Station No . . . . . . . . . . . . . . .NON� . . . . . . . . . . . . . .
Max. Discharge .............�/A............, c.f.s.
Period of Records .....................�A.....................yrs
Date . . . . . . . . . . N!A . . . . . . . . . . Frequency . . . . . . . . N!A. . . . . . . . .
Historical Flood Information:
Period of
Date......... Elev...........ft. Est. Freq. ........yr.Source .......................................... Knowledge...........yrs.
Period of
Date ......... Elev.......... ft. Est. Freq. ........yr.Source .......................................... Knowledge...........yrs.
Period of
Date . . . . . . . . . Elev.. . . . . . . . . .ft. Est. Freq. . . . . . . . .yr. Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Knowledge . . . . . . . . . . .yrs.
Historical Scour Info. : General . .. .NQNE.. . ft. Contraction . .. .NQNE.. . ft. Local .. ..NQNE. .. ft.
Channel Slope .. .. Q.Q047. .. .. ft�ft Source .USGS. (S.Y.LVA. .SQU.T.H). Normal Water Surface Elev. ........1.Q7.1..4 . ...... �.
Manning's n: Left O.B. ....0.07.....Channel ...0.0.45.... Right O.B. ....0.07..... Source .F.IELR ..RE�QNN ..&..HEC-2.
Flood Study /Status . .. .. .. pETAI.LED . �TU.D.Y.. RERELI�IEAT.ER ..(.4.-19-].Q). .... ... Floodway Established?... ...Y.ES.. .. ..
With Without
Flood Study 100yr. Discharge .. .3.90,5. ..c.f.s. WS Elev.: Floodway .. ..1.48.1..� . ...ft. Floodway .. .. .198�0.3.. .. .fF.
@ River Station 2380
DESIGN DATA
HydrologicalMethod ...................................................U.SGS...................................................
Hydraulic Design Method . . . . . . . . . . . . . . . . . . . . . .H.EC. . RAS. .YER . .4..]. (B-59Q5. .SCQTTS. .C.REEK. .US. 23.). . . . . . . . . . . . . . . . . . . . . .
Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity
(yr.) (c.f.$) (ft.) (ft.) (f.p.s.)
@ River Station ......10....... ......580.0....... .....1.98�.2..... ....1.3....
2380 ...........8.4...........
. . . . . .50 . . . . . . . . . . . . �900. . . . . . . . . . . .1.98�..b . . . . .
... .. ]l�0.... .. ... .. .110A0. ...... . .. . ].9.87...Q. .. ..
. . . . . 5.Q0. . . . . . . . . . . .14000. . . . . . . . . . . .1.9.8�..$ . . . . .
. F.EMA . ] Q0. . . . . . . . �9Q5. . . . . . . . . . . .1.98.1..� . . . . .
....t.b....
....1.,8....
...2,0....
..........10..8�..........
..........]].7...........
..........12..4 ..........
Waterway Opening Provided Below:Design W.S. Elev. ...872...s.f.,l00yr W.S. Elev. ..10.Q7...s.f.,Total ..5230...s.f.,
Average Channel Velocity (Design) .....9.8......f.p.s. Average Overbank Velocity (Design) ........3.5.........f.p.s.
100 YR=1.6 PIER 1: 10.6, 11.1
Computed Scour : General .. .. . N�NE.. .. ..ft. Contraction .. .5.�0. .YR=1.6. .. ft. Local .. . P1ER .2:.3..8,..4..].. . ft.
Is a Floodway Revision Required? ......................NO,.MQA.2p..Iv1AX.REGREASE..0.13.'.......................
FEMA DETAILED STUDY (REDELINEATED)
LITTLE TENNESSEE RIVER BASIN
1 OF 2
� BRIDGE SURVEY & HYDRAULIC DESIGN REPORT
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� N. C. DEPARTMENT OF TRANSPORTATION
� DIVISION OF HIGHWAYS
p HYDRAULICS UNIT
N RALEIGH, N. C.
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� I.D. No.......6-�QQ5..... Project No . ............48.�3.7.,1..J........... Proj. Station ..........2Q+bQ. -L-..........
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� County .........JACIC�QI�I........ Bridge Over ..................$C.O.T.T.CREEK........... Bridge Inv. No......2.7......
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SR 1356
m On Highway.. .. .. .. US. 23. .BlJS... .. .. .. Between .. .... NG . 23/.4.41..... and .... ......
(SA�IAN.NAH . .RR). . . . . . . . . . .
� Recommended Structure 1@]25'� J c�.135.',.lQ12.5' .STEEL .1-6EAM..W/..4'.EI�R ..BEN7..CAP.S ...............................
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� Recommended Width of Roadway ........................ 41..5'. F.-F........................ Skew ..........145°.........
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� Recommended Location is ( Up At, Down) Stream from Existing Crossing :...... .... .. .. .. AT... ...... .........
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,,,_ Longitude .........-0.83.'1.4.'.4.7.✓55CY'....... Latitude .........35'22'1465l2".........
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,_ Statewide Tier � Regional Tier ❑ Sub-Regional Tier ❑
�; Bench Mark is . . . . . . . . . . . . . .BM. . #. 5.:. NAII. .SET. .IN. . BAS� .QF. .T.RIPLE. . .W.AW.UT�.STA. .1.9 + Q .7. . .-L-, .53.7.'. LT. . . . . . . . . . . . . .
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� Northing . . . . . . . .7.3.43�2..4b8.4 . . . . . . . Easting . . . .6]b83.3.77.7. 8. . . . Elev. . . . .1.984..36. . . ft. Datum: . . . . . �A�/R . .88. . . . .
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Temporary Crossing .............................................DQ�NSTREAM............................................
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Designed by:...........1N..H.ENRY..WELLS�JR,.P.E............ � �'���F��S�����9���.
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� Assisted by: . . JOS.HUA . G. DALTON,..lLWS.O.N. . R.. HARYEY. . Date = = a/ _\T ' / r = -
� ................... - � 3� j ' =
� Project Engineer : .... ... .�n/, HENRY..W..ELLSy.JR, .P..E... .. . .. f �y ;,� c�- ; �Q��� �.�v
�' SUNGATE DESIGN G�ROUPN PI A oAD ��• ` J�,,�� N� •� �•`
N Reviewed by : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . � � ' �' ,���y�W E�,�r' `4�
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.��� �� _, RALEIGH. NORTH CAROLINA 27606 ����_j-(��,/� I J 1 ���```
NC COA No. C-0890 � �`