20160766 Ver 1_82 0050 2016 B5744 BRIDGE CREEK (aka LEITH CREEK ) SR1615_20160808

INFORMATION TO BE SHOWN ON PLA�NS
WS EL. Taken @ River Station 6248.547
Design: Discharge._--_..270Q.-__-c.f.s. Frequency --------25--_...._yr. Elev. -------141,5._---....$.
Base Flood: Discharge._...._4000_..,..,c.f.s. Frequency,______ 100_______y�, Elev. _____.742_58_______$,
Overtopping: Discharge _.._._4825_...__c.f.s. Frequenry ___.100yr_+.____yr. Elev..._.___142.9____.___$.
OT OCCURS APPROX. 275' EAST OF BRIDGE
ADDITIONAL WFORMATION AND COMPUT14TIONS
DESIGN_FOLLOWS_ SUBREGIONAL_TIER GUIDELINES
_ ..___._. .. - --- -'--- � -- - ------- --- ...._
. .. . ...... .. . ._.._. .,..._. . ... ...__.. _. -- ------- ------- ---_. .. ----- - -------- -----�-----..
DA=5LSmi2_,100%._COASTAlA2EGION 4
-_ ._. ..._. .. -- - -------- -- ---... . ---- � --- - ---- - ._.
_-------RURAL COASTAL PLAIN__._......-------.._.-------------------
----_. --- -- --�- --- -------- - -
USGS SIR 2009-5758
- ------- - - -._...... ._ - ---- -------- -------_. _.____..-� ----- - ---�-- ------- --..
Q�a= 774 (57.8)°'61= 1980 SAY 2000cFs
.._.._._._....---� �-- - -�- - --------- --.._._.... - --- ---- ------- -...--- ----- -- -- --
Q= 245 (51.8)0.606 _ 2680, SAY 2700cfs
"?5 """' _ "' """"""""""""' _ """"' _ "' """"' """"" _ ""' _' _ """"""""' " _ "' """"""""""""""' " _ _' _ _ " _ " _' ... """"" _
0594 NOTE: FEMA 100yr. DISCHARGE
QLoo= 380 (51.8) = 3970, SAY 4000cfs, FEMA=3441cFs USED POR F�MA COMPLIANCE
._ . . . . . - -- . . __ . .__. . _ _
oses USGS DISCH14RGES USED FOR
Q�99 550 (51.8) 5490, SAY 5500ch NCDOT DESIIGN... .,_ ..
OVERTOPPING SCOURi (HEC � 18, APRIL 2012) CdCAC SCOUTt (1�Ayr)i �� � �- �-
CONTRACTION SCOUR ____ __ _____ _ ____ ____________ jCSU EQUATIONI
'""
Y= Y[Q /Q]"[W /W ]K' EQN 6.2 Ys= 2.0 oss oas Fr oa3
-Z -' -' ' - ..t ..� --- -- - - ( - - . 1_. - - - ---- - 1�)CK���K3��Ka��°).. ��� _ �..a� ------ -
Ys: . Y2_Yo. .. __.__ - - --- - �EQN.6.3)_ . ._._-. .. Ys=2.Oj1.01(7.0)(1.7)(7.0)j3Jobs�14:43)oasj0,18)0.43 '
Yz-15:00 [3854.85220L20]d'[2120)0_64-25.02' .. _ . . Ys_=547'------ -------
Y2,-25.02' .. ....... . ... ..--- .. . - ... _... .. . .-----
Ys 25_02'-75.00'-10:02'_.___....
Q, = NATURAL RUN, RS 6248.547, 220120
Q2 =PROPOSED RUN, RS 6222.80 BRU, 3854.85
W� -NATURAL RUN, RS 6248_547 (BOTTOM WIDTH). 21'---- - - - - - --- - -- ----- -- -- -- - -
W1 =PROPOSED RUN, RS 6222.80 8RU (BOTTOM WIDTH), 20'
Yo = PROPOSEp RUN, RS 6248.547, 15.00'
Y� =NATURAL RUN, RS 6248.547, 74.43'
SITE DATA
Drainage Area -_---_51,8mi�.--___------_---_- $ource -_---.--- USGS_QUAD_MAPS--------------------------
River Basin _. LUMBER..----------------- Character --.-RURAL---------------------------------------
Stream Classification (Such as Trout, High Quality Water, etc.) ._C;Sw
Data on Existing Structure 1�a18'5_,7@18'2,,3�a18'0.�1�7a18'S__STEELPLANK_DECK_ON_.1-BEAMS.__.__._.____
END&INT_BTS;TIM.CAPS _ &, PILES�TIM _BULKHEADS,STL.CRUTCH_ _ @ _ _BT#2 _ _ Total Watenvay Opening _ _. _ _ 1037. _. _ _ s.f.
________ _"
Watenvny Opening Below 100yr. WS EL. __._ 7000______ s.f.
Debris PotentiaL• Low_. X__ Moderate .____. High .__._
Data on Structures Up and Down Stream UPSTREA/y1:_ U5501, SCOTLAND. _BRIDGE_ #78..3@50' 36"_ PSG ___. _
DOWNSTREAM:.NC83�ROBESON.BRIDGE.#28._7@21';4�a20'�1�a21';2 SPAN_CONTINUOUS_REINFORCED.______
CONCRETE FLOOR!!CONLI-BEAMS; SUBSTRUCTURE: E.BTS&BTS: RC CAPS?IMBER PILES; BTS: TIMBER CRUTCH
- - - --------- - - - -_... .. .. - -- � - � ------ -
. .._..- - - --- ._ - � ------
MAINTAIN OR IMPROVE
Design Control Elev. ?5yr &__100yr BACICWATER. ft.
Gage Siation No. ____..__.__..WA______________ Period of Records WA
--- - - - � ... - - � -- .-..yrs.
Max. Dischar e_ _.__. WA. ..________ c.f.s. Date _.._ WA __ WA_,___.___
g ---------- Frequency --
Historical Plood Information: COUNTY MAINTENANCE ENGINEER REPpRTS
NO KNOWLEDGE OF OT IN THE PAST 7-8yr. Period of
Date---------.Elev. ...._...ft.Est. Freq. ._..--_Y�,Source -- - -------- ------__ -_,--..__._ K�owledge__-_....yrs.
Period of
Date--------- Elev.--------- ft. Est. Freq. ..---_-YcSource __._._..._..---------_.-_-----_--- Knowledge-------_--yrs.
Period of
Date----_--- Elev.-----_--ft.Est. Preq. --------Yr.Source --_.___-_-_--__-__-------------- Knowledge---.-----.yrs.
Historical Scour Info. : General ..... Wp_,_ft. Contraction.__. �`i!E+...__ft. Local.._._w�±___.ft.
QUAD MAP
Channel5lope_.0_000453___fthFSource. ._F�/yb4,/y�OpEL______ NormalWaterSurfaceElev..... ...736_3. __f}.
EFFECTIVE FEMA MODEV
Manning's n: Left O.B. 4,16 . Channel ._Q..Q5b . Right O.B. .9.•16 . Source _ PUBLISHED DATA.__
Non-Encroachment
Flood Study/Status LIMITED„DETAIL STUDY -_EFFECTIVE_ DATE 1ULY7,2014. _ Established? _ YES ____
Flood Study 100yr. Discharge._..3441__ c.f.s. WS Elev.: With Without
Non-Encroachment 142A4. ft. Non-Encroachment .141,76__ f},
@ River Station 6347.483 (219)
DESIGN DATA
Hydrological Method. USGS RURAL REGRESSION EQUATIONS, SIR 200-5158 REGION 4
Hydraulic Design Method _,. HEC-RAS� VER. 4.1.0.
Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity
(Yr.) (af.$) (H�) lk.) (f.p.s.)
@ River Station . 1�----, ----- 2400------ _._ 140.8 ---- -- �'3--- ---.- 2.3 ---------
6248.547
_.25--- -- ---- �Z00-- -- 141.5.- --- --�`4-- - ---- ?:9._ -
--100.---- - 4000 ----- --- 742 _58---- 0'57--- ---- 4.0
500 5500 743.5 07 5.1
100yr_FEMA., ..3441------- --- 142.20.._, �=35--- ---.---- 3=4----- --
Waterway Opening Provided Below�esign W.S. Elev. .944____s.f.,l00yr W.S. Elev. ._lQtb___s.f.Total __ 7.41¢ _ s.f.,
Average Channel Velocity (Design) _.__2:�$__...f.p.s. Average Overbank Velocity �Designj __...._Q.55.._._.. f.ps.
Computed Scour : General _______._..__,ft. Contraction ._700yr=70,02._, ft, Local _.100yr=5,47 ft,
Is a Floodway Revision Requiredz ,__ YES,_MOA TYPE 2d
- - - ---- ---- --_..... ------- ------- ------------ -
FEMA LIMITED DETAII STUDY
i LUMBER RIVER BASIN
"' BRIDGE SURVEY & HYDRAULIC DESIGN REPORT
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�; N. C. DEPARTMENT OF TRANSPORTATION
�`; DIVISION OF HIGHWAYS �//G
�; HYDRAULICS UNIT vV G`
� RALEIGH, N. C.
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�Y; I.D. No.---_g-5744-_--- ProjectNo. _.---45700,7.1--------_------- Proj. Station -------15+55--1 ------_,-,--
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��' Coun SCOTLAND.__.__ Brid e Over _ BRIDGE CREEK aka LEITH CREE ' g
�t; b' _ ................. 9 ._..--�-�-- ------- �- - �- Bnd e Inv. No. -50 -----
N�; On Highway _ SR7675_(HASTY RDi._. Between __(SMYRNA6CH. RD)_ and .. SR1624 _(GRAHAM_RDj____.__,..
OW
oC9; Recommended Structure __..?1" & 2A" CORED SLABS,.(1@30', 1@60', 7@30'! W/4.0' END BENT CAPS
o�- ---- - -- -- -- - -
mm;
- ----- ------- ----- -- --�----------- --- _ -- --- ----------- -- ----- --- ..._..._ � --------------------
i Recommended Width ofRoadway_._33'O�T-0�1T_(�0'_-74"_FA�E-FA���______.___ Skew__...90deg._______
Recommended Location is ( Up At, Down) Stream from Existing Crossing..__ AT EXISTING__LOCATION_,.._
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LL Statewide Tier ❑ Regional Tier ❑ Sub-Regionnl Tier �
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aBench Mark is ._RR_SPIKE.�N.ib"_POPLAR,-BL-_STA.14+30,00_65'_LL_.________________________,____.,,._______.__
' --N_331425;_E_1$64274-__-----_----_--------_------„- ---_ Elev. __ 143_92-----fF. Datum:----NAYD$8-.-----
o� Temporary Crossing __ NOT_REQUIRED, QFFSITE.DET_OUR
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