20160765 Ver 1_82 0043 2016 B5746 LEITH CREEK SR 1645_20160808

INFORMATION TO BE SHOWN ON PLANIS
WS EL. Taken @ River Station 73,828.47
Design: Discharge -------375-----,--_�.f.s. Frequency -------- �#_------ yr. Elev. _--_--.186,8---_----ft.
Base Flood: Discharge -_----1720-_,----.c.f.s. Frequency --------100--------y�.. Elev. ..__... 189.48._--_.ft.
Overtopping: Discharge.,___ 460-- -------c.f.s. Frequency ---,-.2+..------yR. Elev. ------787_k��-----$.
' DESIGN MAINTAINS EXISTING LEVEL OF SERVICE "* OT AT SAG STATION 13+95.23 -L-
ADDITIONAL INFORMATION AND COMPUTATIONS
DISCHARGES (oa = is � s4_rni_� FE�MA DISCHARGES
RURAL-COASTAL PLAIN ; SIR 2009-5158 ; REGION 4 FIS REPORT JULY 7, 2014
- --------- --------- - ------- _ . .._ ...._ _ -
-- --- --- -- -- -- ------ - - - - -
Qz =60_3(DA)ob'9-60.3(12J)649 = 373.8 CFS , SAY 315 CFS
.._..._ --.._ ..... _. _._ .. _... - ----- -- --- -- ------
QS =123(DA)�'6'=723(72.7) bZ�= 605.3 CPS , SAY 605 CFS
-- . _ - -__. - - - -- ----_...__ � - - - -- ---- -- ----- -- - ------ -----
-- Q,o_=174(DA)ob'�_ 174Q2.7) 61� - 834.8 CPS , SAY 835 CFS Q�o = 1,07$ CFS
- _ - ---- -� -----� ------ � �-- -----------
QZ5=245(DA)o.bob=245(72,7�b.606_ 114S.O CFS , SAY 1150 CFS
- - - -- - --------- - - - --------- - --- --- --. ------------- ---- ----------- ------ - -.._.. -
aso =309(DA�o.eoo 309(12.7)aem_ �479.8 CFS , SAY 7420 CFS Qso = 1,761 CFS
-- - - - -------- -- - - - ---- -- ......
- ------- -- -- -- -------- _ . _._,... .._ . ....
Q�� 380(DA) 59=380(12.7) $94= 1719.7 CFS , SAY 1720 CFS Q�oo 2,065 CFS
--------- ----�---------- -- - . . .. . .
---- - ------- ----- -------- ------�---�---
Qsoo-550(DA)osea_550(12.7)osea= 2420.4 CFS SAY 2420 CFS Qsoo= 2,�50 CFS
- -- --- - _�--- �- - ------------�---- -----� ----- - - ---- - - -�� � -- - - - -- - --- ._.- - - - -
NOTE: FEMA DISCHARGES USED FOR FEMA COMPLIANCE. USGS DISCHARGES USED FOR NCDOT DESIGN
. _ .. . . . . . . . . ..... _., ... - ---- --....
--- ------ --- ---- - -- - - --- - --- - - - -- ---- ---__ -_-------- --- ---- --- ------� --- -�-
OVERTOPPING SCOUR: (HEC 1$, APRIL 2012)
- -- � - -- - - � - - .. . - -.. ...- --- - ---- -- - - ---- ---- - ------- - --- ----
CONTRACTION SCOUR
- YZ Y' ���Q�]� ���21� __ -__ . IEQN. 6.2) .... Q� : NAT. RUN R.S._T3857.47 - __-__
Ys Y-Yo (� : REVISED RUN R.S. 73777.25 BR U
-2 --IEQN_ 6:3) _ . -- ' . -- -
. ' ' ._. __ __. ___ __ " _'"_ ._'__ ."".
YZ= 4A [459.8292.9]�' [41.U38.5] 69 W� NAT. RUN R.S. T3857.47 (AVG. BOTfOM WIDTH)
Yz- 6.1 Ff WZ : REVISED RUN R'.5. 73777.25 BR U(BOTOM WIDTH)
- ----- ------ - - --- - -- - -- - - - - ------ --- -- - ----- -- --- - -
Ys= 6.1 FT - 4.4 FT y: REVISED RUN R.S. 73828.47
� ----- - - ---- - ----- �------- - - ------ ' . - --- ---- ... - - - --- -_......_..
Ys- 1.7 FT y NAT_ RUN R.S. T3857.47
DESIGN FOLLOWS SUBREGIONAI TIER GUIDELINES
-- _ -- -- ___-_.._..____...._._.__ - - - --- ----------------------- -- --.___..._ _ --- ---------
SfTE DATA
Drainage Area ____._�Z_�_5�2•M�__ _ , _ . $ource __�URINBURG QUAD MAP/FIS
River Basin ---_,-_ LUMBER_ _-- - ----- -- - _ Character ------------RURAL.--COASTAL PLAIN-_----__--
Stream Classification (Such as Trout, High Quality Water, etc.) .. CLASS C, Sw
Data on F�cisting StrucFure �@�6' 1@14'8" 1@15'10" TIMBER DECK ON TIMBER JOISTS ON TIM. CAP & PILE
BUILT 1962;-L-47---------------- - --.___...-------------------------Tota1 Waterway Opening _-- 180....--- s.f.
Wntenvay Opening Below 100yr. WS EL. _ _ _ _ 1_@Q _ _ _ _ _ _ s.f.
Debris Potential: Low..X.___ Moderate ..______ High ____._
Data on Structures Up and Down Sfream .-----------_-_--..._.--_..._____-----_---------------__----------.--
ILS: 4@6'X70.5' RCBC ON RAIL ROAD TRACK. STR.#82021 ON US74BU5; 7@36'8" RC DECK GIRDGERS; BUILT 1924
L15:_1�72" 7_�84"_7@72"_CONCRETE_PIPES ON RAIL ROAD• STR.#820097_ ON_SR7323; 3�8'X8'RCBC, BUIIT 1960
_- - -- - - - `--- -- - - - - ------
Design Control Elev. _______ 189.75 {{, (FEMA 100 YR CE RUN, R.S. 73828.47)
Gage Station No- ---------------wq----.__.._..._ Period ofRecords ----_---__-_-�`i!p,----._...._....___
. _yrs.
Max. Discharge ____._. wp c.fs. Daie wp _____.____ Frequency .,. . WA
----------� ---------
Historical Flood Information:
2008 189'+/- 700+ FRED CHAVIS Period of
Date_______Elev...... ..ft.Est.Freq. ___.__.y�,Source _{BR.MAINT.SUPERVISOR) __ Knowledge_._$.__._yrs.
OFTEN HAS OVERFLOW ISSUES ROYLIN HAMMOND Period of
Date . _ .. _ . _ _ . Elev. _ _ _ _ _ ... _ ft. Est. Freq. _ wA_ _ _yr. Source DIRECTOR _ OF_ EMERGENCY _ SERVICES Knowledge _ .. WA_ _ _ _yrs.
Z���ER 189'7 +� 100+ ALPHONZO RALIFF (LOCAL RESIDEN Period of �+
Date------..- Elev.-----_--ft.Est. Freq. -----_-Yr.Source--------------------_.-.---_-----------�ICnowledge____..yrs.
Historical Scour Info. : General._.,[YA______ft. Contraction_,._ WA_.._}}. Local___ WA____. ft.
ChannelSlope_____0.0074____fyHSourceUSGS,QUAD_/SURVEY. NormalWaterSurFaceElev.._l$5:�....__._..._ft.
EFFECTIVE MODEL &
Manning's n: Left O.B. .. 0•12_____Channel _.� p$._.... Right O.B. . ��1z Soorce ..?UBLISHED DATA
..- - - ...._.- -
LIMITED DETAILED FEMA FLOOD STUDY
Flood Study/Status EFFECTIVE DATE JULY_7�2014 ....... . .... .. ._ Floodway Established? _YES
With Without
Flood Study 100yr. Discharge. 2,065 c.f.s. WS Elev.: Floodway 790,80____.ft. Floodway 189.90 „ f{,
@ River Station 73,813
DESIGN DATA
Hydrological Method _ USGS SIR 2009-5758 (REGION 4) & FEMA FIS REPORT (FEBRUARY 20, 2008)
Hydraulic Design Method HEC RAS 4.7.0
Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity
(yr.) (c.f.$) (ft.) (ft.) (f.p.s.)
@ River Station 2 375 186.8 0.1 1.5
73,828.47 - -- . - - ------- ----
- 10 -- - -... 835- ------- - 188,5_ ---
- - 25--- ------115II_.__._ .184.0----
_]00----- --_- 1720------- _...189;48---
. 100 FEMA ____ 2065 789J3
- - 0.1
--�_�-- --
--- 0.02 _
0.00
------- 2'b----- ------
--.- 2 _5 - - --
- - 2`5--� �------
.._- 2=4 -
500 ---- 2420-_- -_.190.0 ----- _-0,00--- _- 2.4.. _.
--- -
2 YR
Waterway Opening Provided Belowflesign W.S. Elev. _�?7:4...s.f.,l00yr W.S. Elev. _�77-4_s.f,Total ._ �77.4s.f.,
R.5 73828.47 R.S. 73828.47
Average Channel Velocity (Design) ... �.:6..._..f.p.s. Average Overbank Velocity (Design) ._.____0•b_____.. f.p.s.
ABUTMENT
Computed Scour : General .___ wA.__.__ ft. Contraction ._____��Z ff. Local ______.. wA._______ ft.
Is a Floodway Revision Required? NO. MOA TYPE 1- NO RISE NO IMPACT
-� --- --- -- _ _ _ . - ------- - - --- ------ --------- -----
FEMA DETAILED STUDY
LUMBER RIVER BASIN
g; BRIDGE SURVEY & HYDRAULIC DESIGN REPORT
�; N.� C. GEPARTMENT OF TRANSPORTATION ���
� DIVISION OP HIGHWAYS
N ; HYDRAULICS UNIT
W RALEIGH, N. C.
W ,
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F: I.D. No.__B-5746 _- ProjedNo. -_-_--45702.1,1 ___ --- Proj. Station _._.15+28:5--L -----_------
'�' County SCOTLAND g LEITH CREEK y
' ---�------� -- -------- Brid e Over ------ -- ---- ------ - . ............ Brid e Inv. No._.__43.._..
^; SR 1645 (DIXIE GUANO RD) SR 1323
�; On Highway- .---.--_ ------._. Belween _SHIGHLAND--RD}--. and ---74 BUS
�; --------- --- - � -
.o ; Recommended Structure 1@55' 21 INCH CORED SLAB UNIT BRIDGE WITH 2.5' END BENT CAPS.
� , _ ------- --------- � -__.. . ..--- - -------- -- -- ... .. - ---- ---
o;
N;
M; - - ---- - --- ---- - -- - --- -- - - --- - ---- - ----- -.... ... . - -- -- --- ----
o� 27'-10" CLEAR ROADWAY 30 OUT TO OU 90°
o; Recommended Width of Roadwaiy--------.---------------------i-----...-----.--?�-- Skew --------------._._..
°N° Recommended Location is (Up,At Down) Stream from F�cisting Crossing,_____EXISTING LOCATION
ai- - - - ---------
LL Sfatewide Tier ❑ Regional Tier ❑ Sub-Regional Tier �
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o�, Bench Mark is 7BM1, BENCH _TIE NAIL_SET_IN_ 20" DBL_PINE; -BL- STA._78+74.00_._._______________________._,_
_-- N 370747'; E 1$68106' - - -- - - - ----- - -- - - --- Elev. .,_198.78'---ft. Datum:_-NAVD 88
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Temporary Crossing ____ NOT REQUIRED.OFF SIDE DETOUR
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Assisted b : .. _ _. _ _ _ ��DREW T, NOTfINGHAM, PE � �: �+ . . ,�
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o Project Engineer :__MELANIE Q.C. NGUYEN, P.E.
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N Rewewed by: � ' _ �. l.(NVt' � .Y �J.1Y J��Oi���Llii �ipu��S��`�
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