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SITE DATA
INFORMATION TO BE SHOWN ON PLANS ,gir
_7_ .S_Ct MI Source . USGS. Q UA D_ MAP
WS EL. Taken @ River Station 5072 Drainage Area 3 2CAPE FEAR BRIDGE SURVEY & FiYEY',AULI1C DES GN REP4PRT 01-
Design: Discharge 1,760 c.f.s. Frequency 25 yr. Elev. 577.7 ft River Basin __„(10_RD_AN__LAKE_V_VAT.ERSHED).____ Character LOW___RESIDENTIAL_C_O.MMERCIAL,ANDUSTRIAL N.. C. DEPARTMENT OF TRANSPORTATION
cu-41 Base Flood: Discharge 2,27_0 c.f.s. Frequency 100 yr. Elev. 579.1 ft Stream Classification (Such as Trout, High Quality Water, etc.) WS,V,: FEMA FLOOD ZONE AE DIVISION OF HIGHWAYS
NSW o
1(PRELIMINARY DETAILED STUDY,
> HYDRAULICS UNIT
Overtopping: Discharge 3,050 c f.s. Frequency 500 yr. Elev. 550.6 ft Data on Existing Structure 1a17.'8.", 1_@.1.7'_Q"_,_1@l7'.8"_TIMBER_DECK. ON _TIMBER_JO_ISTS,_OVERALL_LENGTH = .52..31._ w DATE: FEBRUARY 21, 2014)
0 RALEIGH, N. C.
.1
*OT OCCURS AT ROADWAY STA. 15+35 ROADWAY CENTERLINE .....END....&_INT..BIS..;_TIMPLER_CAPS,P.O.SIS_&.CQNC.,SILLS,..T.IM.BER.BU_LIKHEADS____Tota I Waterway Opening 37_5 s.f. csic
Waterway Opening Below 100yr. WS EL. 37_5 s.f.
ul I.D. No. B-5346 Project No. 460_60.1 1 Proj. Station 14±03 -L-
Debris Potential: Low __I.__ Moderate High .1
ADDITIONAL INFORMATION AND COMPUTATIONS
••1 •
r. co County ALAMANCE Bridge Over DRY_ CREEK Bridge Inv. No. 3
Data on Structures Up and Down Stream UPSTREAM:NC _87__P_SSieEE..R.co.a'.x_7:_RCBC SI SR 1529 SR 1666 SR 1803
,. 1
- -0.DOWNSTREAMNQ _COMP_ARABLE_STRU_CTURES_DOWNSTREAM On Highway(D_URHAMST._EXTENSION) Between ....(LITTLE_JOHN__LNI)... and .(DURHAM MEADOWS DR)
_U S_GS...URBA N._REGRESSION__EQUATIONS_FRQM__SCIENTIEIC__IN.VEST)GA_TI ON S__REPORT_2.014,50a0 ‘.1 043
`NT- Hi Recommended Structure 1 @/. 70'.:.-_.24_"__P_RESTRESSED__CONCRETE_CQRED__SLAB.W/4.0.'_END__BENT_CAPS___.
8
0
DA = 3 27__SQ...ML Design Control Elev. _IvSATCQRREDUCE_CORRECTED EFFECTIVE 100 YR EL=579.7' 014
0 itt
IMPERVIOUS_AREA % = 2 o_.a (EUTLIRE_IMPERYJOUS_FRQM _ZONING_ DATA) Gage Station No. N/A Period of Records N/A yrs. Recommended Width of Roadway 3.010.."__F_ACE,FACE 33.11"_QUIOUT Skew 90°
Max. Discharge N/A c.f.s. Date N/A Frequency N/A_
Recommended Location is ( Uo,O-Down) Stream from Existing Crossing,
cu
ir Statewide Tier El Regional Tier l=1 Sub-Regional Tier IN
_US_GS_DIS_CHARGES Historical Flood Information:
PRELIMINARY FEMA PRELIMINARY FEMA HURRICANE FRAN Period of Cue5 Bench Mark is BM1_,_-BL-STA,18..+.6B 00,142LRIGHT_,_Ra3. SPLKE IN__BASE__OE_20"_BEECH__TREE
REGION__1,_3.0_SQ..MI_ ,__DA._,._.._43_6_SQ._Ml. SAY f IS_DISCHARG_E_ _FLO_OWDAY__DISCHARGE Date _79.96_ Elev. _577 7 ft. Est. Freq. ._25.__yr.Source ___DELORIa.McFARLING.,_RESIDEN.T___ Knowledge._._3.6._...yrs. a-,
0.5539 0.0060 Period of
20.0 Elev. _5_7_6.85_ ft. Datum: NAVD...88
= 48443_27) 10 =i,2ao__CFS. .1.,2_00._CES 1,210_ __CES Date:1_0/2016_ Elev. _57_3.5_ft. Est. Freq. ..10.- _yr.Source HIG_H_ WATER../Y1ARK Knowledge - yrs. cl
Period of
0.5470 0.0046.'20.0 *cg Temporary Crossing 15.N.OT_REQUIRED - TRA.EELC_ MAINTAINED _VIA OFFSITE_IDET_O_UR
..Q.25 = 657._(.3.27) 10 =1,552..CFS _1,6_00__CES L7_60CES _
Date Elev ft. Est. Freq. yr.Source Knowledge yrs. -.1'.‘°
, t 2,;,:i;,,, ,,,Iii,,:7:.;., .,,, ,T.: ,‘ , ,. . :. •Vs* se4.-: ;!:.1-•• ,. ,,,,
0.5428 0.0037'20.0 =1,791_CES 1,8_00__CES 2,020_CES ___ Historical Scour Info. : General. _NQNE.....fl. Contraction.___NONE _ft- Local.___NONE _ft. .
0.5386 0.002820.0 d
.Q..100 = 941_(.3.27) ]O =2026__CU_ 2,000_CF_S 2,270_CES 2,2_7_0_..CF.5 Channel Slope 0.005 ftift Source FIELD_ SURVEY Normal Water Surface Elev. 5.68_3 fi.
Li
0.5305 0.00W20.0 _
_Q.5o0 = 13_19.0.274 1Q =2,6.01_CES 2,6.00_ US 3_,050._CES Manning's n: Left 0.B. ____0,15 Channel _0.0.5_ Right 0.B. .0..15 Source FIELD _SURVEY
FEMA DETAILED STUDY - ZONE AE .1?-7(1) C;1:t ' ' ' ,-. .=.- - -:'`. ..'7MattrW77.,:,i.'
fa_
Flood Study/Status PANEL A:_88.56__EEFECTIYJE_DAT_E:_9Z6Z.06 Floodway Established? YES
With Without -0,
AET.ER.COMPARISQN,THE__PREUMINARY.F_EMA__EIS_DISCHARGES.SHOULD _BE_USED__RD R_DESIGN Flood Study 100yr. Discharge.__2,2_7_0___c.f.s. WS Elev.: Floodway5.79_.4.,_._ft. Floodway 579_A____it A . . ,
. . . . , .
@ River Station 5068 „
i.
' . . ...
ca.
TH.E_EEMA_100,-YR_DISCHARGE WILL BE USED FOR_MOA_COMPLIANCE
DESIGN DATA ' -..•-::- '--- ..i.,4-, ,44.zi:--, ,,. - . • -. ' ,'...... ..,. ''.:V., • -•..,:40,44,1:. - . • -'-....
6
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''';`,''',':):':::::'
_LIY.E,BED__10.0-AR.CQN_TRACTION__SCOUR.(C_HANN.EL). Hydrological Method._.....LISGS__URBAN__REGRESSION__EQUMLONS_COMPARED WITH FEMA EIS_DISCHARGES ci
Hydraulic Design Method BEC,RAS__4.1.0_(B534.6_DRY_CREEK_SR1529) cs'i‘
--fY2-..-.YD q°
6,7 K1 Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity . ..... .
.Ys. =Yi.E.(.07..ZOJ_).....(W.,_/_v_i..2..).._1,_Yo...;ASSUMED D.5.o.. = 2 4 _mm. 6
(yr.) (c.f.$) (ft.) (ft.) (f.p.s.) '
6/7 .64 @ River Station 310 1,210 576,5 _0.4_ 4 5 . .
- 10.7 = -1 3 = 0 Q 5072 •
c
DESIGN 25 1,760 577 7 _0.4_ 5 0
2 .
50 2,020 57.&a _0.4_ . -- -
4 5 L7i
NOTES: •579.. ._0.7_ 5 0 crilirrli711/.'-
‘s
1. NO UPSTREAM OR DOWNSTREAM STRUCTURES CURRENTLY WITHIN 100 2,270 •'‘‘' C A F?° /*Pi/.
THE FLOODPLAIN AT THE TIME THIS PROJECT WAS DESIGNED WILL 7 s\\,q,"\\'`
' s. .C) \`‘‘‘,'S,,S;
BE ADVERSELY AFFECTED BY THE PROPOSED BRIDGE. 500 3,050 58011 .0.8. 6 O. 6.' - •`\c_.„,,T, ,
2. CHANNEL IS STABLE AND BED MATERIAL IS COMPOSED OF GRAVEL, Waterway Opening Provided Below:Design W.S. Elev. _367 s.f.,100yr W.S. Elev. _45.6_ _s.f.,Total. _45_6 .s.f., ce Designed by: E .M__LEONHART SEAL
SAND AND SILT. DEBRIS POTENTIAL IS LOW. 0 Date ,'-' -
- -
'- -
Average Channel Velocity (Design) 4.2 f.p.s. Average Overbank Velocity (Design) 1.1 f.p.s. Assisted by: _R. L 0_V.V.ARD,_B.I...SMITH -,... -.... 9334 ;-....- 51
3. SUB-REGIONAL TIER DESIGN GUIDELINES APPLY TO THIS PROJECT. (RS 5148) (RS 5148) e - c,,.. .,
f•-;,..- •• ••"--,s 4/ e_<(,,‘."'.....<2-*--;"'
Computed Scour : General NONE ft Contraction 0 0 ft Local NONE ft. Project Engineer : NJ HERRY..WEILLS.,...1R.,?_..E "e(</de ‘(-D $:
2° r SUNGATE DESIGN GROUP,P.A. c/V" RY \NC-\--
Is a Floodway Revision Required? NO_ .MO_A_ TYPE.2.a.(0.6__MAX_D_ECREASE..@ STATION .507.2) Reviewed by: .",,,f/4...jr..,iit2 ,/
i,-) .C1 2//142,-0E7
5-\--: ,---1.? 915 JONES FRANKLIN ROAD
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\--21 RALEIGH,NORTH CAROLINA 27606 1-,,- NC COA No.C-0890