20161109 Ver 1_02 2032 2016 SF-022032 PRATHERS CREEK NC 113_20161216

ADDITIONAL INFORMATION AND CO/w1PUTATIONS
HYDROLO�Y----------------------------------------------- ----------------------------
--DRAINAGE_AREA=--5,4_ SC�.MI--------------------------------------------------------------
--�QO%_HYP�4�aL_RE�14�L-�---------- - ------------ - ----------------------------- - -------
_ _ _ _ _ _ _ RURAL BLUE RIDGE _
---------- - ------------ - --- - -------------- - ---------------- -
SIR 2009-5158 USE
----------------- - --------------------------------------- - ------------------------------
0.]36
Q= 288 (DA) = 996 cfs. 1000 cfs
--10-------- ---------- -------------------
__0.72A " _'_'"__'_____________'__'
Q�S= 398 (DA) = 1350 cfs 1400 cfs
---- - ---------- - - --------------------------
0.]18
Q= 479 (DA) = 1608 cfs 1600 cfs
--50-----------
0713 ___"""""___""_ " '_'__'_"""""""_""__'"_____" " _
Qioo- 575 (DA) = 1914 cfs 1900 cfs
---------------------------------------------------------------
0.]04 __ _____________
Qsoo- �94 (DA) = 2600 cfs 2600 cfs
OVERTOPPWG
_ _ ROADWAY_ SAG_ LOCATED _AT -L. _STA. 13+70.3. WITH_ Ay _ ELEVATIq[y .Q�_2Z�$.2_ F[__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
__THE_ROADWAY_CROSS_SECTION_IN_THIS_AREA_IS_yQRMAL_�RQV�N_________________________________
__2900_cfs IS THE DISCHARGE_REQUIRED_TO__BEGIN_QVERTQPPIt��____________________________________
----------------- - ----------------------------------------------------------------------
EXISTING CHANNEL DESCRIPTION
APPROXIMATEIY 25' WIDE CHANNEL FROM_ TOB TO _ TOB, 19' WIDE BOB_ lf0 BOB, 3' DEEP_ FROM _TOB_ TO_ _
STREAMBED, WITH _ 1:1 TO 2;1 SIDE SLOPES, THE WATER WAS CLEAR ON _ THE_ DAY_ OF_ THE SURYEY.
__ STREAMBED. CONSISTS OF_SAND, GRAVEL� AND COBBLE. __ _
_ ' ' __ ' '"_ __ _" ______
SU6-REGIONAL_TIER_ DESIGN _ GUIDELINES APPLY_ TO_ _ THIS_ PROJECT _ _ _ _ _ _ _ _ _ _ _ _ _ _
SITE DATA
SELECTED SITES /
Drainage Area , _ _ _ _ _ _ _ _ 5.4 _$Q, M�_ _ _ _ _ _ _ _ _ Source _ _ _ _ _ _ _ _ U��S_ 5�4A4_ MAP f LAI�REL_ $PRIIy.G�)_ _ _ _ _ _
RiverBasin --------- NE�N__RIYER---------- CharacFer ------------R�RA�:�4UE_RID�E�------------
Stream Classification (Such as Trout, High Quality Water, etc.) _ _ _ _ _ _ _ _ _ _ _ _ _ _ B'?r:t _ _ _ _ . _ _ . _ _ _ _ _ _ _
Data on Existing Structure ___ 17'_ 5° x_77'-6"_ CORRUCzAT�D _M�7A4 PJP� AR4H _qM _CS>NCRET.� F9Qt�[�LCxS ___
Tofal Waterway Opening ____157 ___ s.f. Woterway Opening Below 100yr. WS EL.. ___ 757 ___ s.f.
Debris Potential: Low � Moderate ❑ High ❑
Data on Structures Up and Down Stream __UPSTREAM:_ 1�a17'X8.5_ PIPE_ARCH; NEAR SR_ 1161_AND SR 1149 _
_ _ _DOWNSTREAM: ALLEGHANY_CO. BR_ #009; 1�70'� 1@55';_OAL _125';_24"_ CORED .SLAB BRIDGE_ _ . _ _ _ _ _ _ _ _ _
Gage Station No.----------I�/A--------- Period ofRecords -------------�Q---------------yrs.
Max. Discharge.________WA______._c.f.s Date_______tyA_.________ Frequency______WA__.___
Historical Flood Information:
�989 LARRY DAVIS - LOCAL RESIDENT Period of
Date_ (yUGQ)_ _ Elev._ 2758' .ft. Est. Preq. _ _ 50 _ .yc Source _ NEAR_TOP_OF_ �UIYEBi _QPENIJ�iG Knowledge_ _ 36 _ .yrs.
Period of
Date___wA._ Elev.__C�!?__ft.Est.Freq..N�L+__yr. Source _____________�____________ ICnowledge_yiA__yrs.
Allowable HW Elev. ___?�605 fEXISTING 50-YR WSEL)_ __{}, Normal Water Surface Elev. 2749J
------ --- -------------ft.
Manning's n: Left O.B. __ O 10_ ._ Channel _ 0_045. _ Right O.B.O _05-q.79 Obtnined From FIELD _SURVEY (Y1016)
NO FEMA FLOOD STUDY
Flood Study /Status _ _ . _ _ _ (FIS REPORT_- EFF, Q/712009, REV,1 V4200Q)_ _ _ Floodway Established? _ _ _ WA _ _ _
With Without
Flood Study 700 yr. Discharge _ _ _ WA _ _ c.f.s. ; WS Elev.: Floodway _ _ _ WA_ _ _ _ft. Floodway _ _ _ _ w9 _ _ _ fF.
DESIGN DATA
Hydrological Method _ _ . _ . _USGS_ RI�RAL REGRESSION_ EQUATIONS (SIR 2009_ �158)_ _ _ _ _ _ _ _ _ _ _ . _ _ _
Hydraulic Design Method HEC-RAS 4.1A (022032 Prathers�Creek NC113.prj) _ _ _ _ _ _ _ _ _ _
Design Tailwater ' (� 5.3 ft.; Q 5 _8- - }{_% Q _ 6.0 }t,;(� - - 6 3 ft.% (� - - - -7.7 }t.
10 ----'---' 25'"" 50 '- 100 ---- 500 -'--'-
Inlet Control OuTlet Control
Q H.W. dc+D H.W. Remarks
Size & Type �c.f.s.) Ke HWiD ({�.� dc 2 ho H LSo (ft.)
SEE HEC-RAS MODEL:
022032 Prathers Creek NCI13.prj
Is a Floodway Revision Required? _ _ _ _ _ _ _ _ NO_ _ _ _ _ _ _ _ _ Total Proposed Waterway Opening _ _ _ _ �?9_2_ _ _ s.f.
Outlet Velocity (V�o) _ _ _ _ _ _ _ _ 12_1_ _ _ _ _ _ _ _ _f.p.s. Natural Channel Velocity (V�a) _ _ _ _ _ _ _ _ 7 3 _ _ _ _ _ _ _ _ ,f.ps.
Required Outlet Protection _ _ _ . _ CLASS_ II RIP RAP_ WiGEOTEXTILE. FABRIC_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Design: Discharge . _ _ _ 1600_ _
Base Flood: Discharge ___ 1900_ __ �.f.s.
Overtopping: Discharge . _ _ 2900 _ _ �.f.s.
@ River Station 436.9
Prequency ------ 5�------_yr. Elev. -------2760.3-------{}
Frequency ------100----- Yr. Elev. -------2761_83----- ft
Frequency------500+---- Yc Elev. -------2768.2-------{}
CULVERT SURVEY & HYDRAULIC DESIGN REPORT ���
I�
N. C. DEPARTMENT OF TRANSPORTATION �� �
DIVISION OF HIGHWAYS ��I �� ��
HYDRAULICS UNIT
RALEIGH, N. C.
a; I.D. No.__SF-422432__ ProjectNo. -------lZ_BP.11�.]------- Proj. Station ----STA_11+44J-4------
' PIPE#
o� Counfy _ _ _ _ _ A�.LECzHANY_ _ _ _ _ Stream _ _ _ _ _ _ _ _ _ _ _ _ _ _ PRATHERS_ CREEK_ _ _ _ _ _ _ _ _ _ _ _ _ . Stru. No. _Q22Q32 _
N'
o, On Highway------- N�_113------- Between ------US_221------ and ----SR 71¢0_�BR�{pY RR.� ----_
��
"'' Recommended Structure _ _ 1_ @ _ 18'-01" x 11'-10" STRUCTURAL_STEEL_PLATE_ PIPE_ARCH, WITH_ 6"x2" _ _ _ _ _ . _ _
�O' CORRUGATIONS, 31" CORNER RADIUS, SOIL BEARING CAPACITY OF 6000 LBSSF AT PIPE CORNERS,
c�.r _TOP_EDGE_BEVELAND_WINGWALLS,BURIED_1'____________________________�______________.________
��
o� Recommended Width of Roadlway ____ 34' SHOULDER PT, TO_ SHOULDER_ PT._ _. gkew ____ _ 7p"
N'
o; Recommended Location is At, rt�Sheam--fram- Existing Crossing_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
�
LL Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier �
a� Bench Mark is -----BL #3,_,dS= l-_STA._13+68,75,-15-LT------------------------------------------
V, --------------------------------------------- Elev. __27d7,6T-ft. Datum:----NAVD_88---
a; Temporary Crossing _ _ _ _ _ _ _ NOT_ REQUIRED , _ TRAFFIC MAINTAINED VIA_ OFFSITE_ DETOUR _ _ _ _ _ _ _ _ _ _ _ _ _ _
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�' RALEZGH,NC 27609,LICENSE NO-F-0112
v' 10NATHAN M. WHITfINGTON PE
y� Designed by------------------------------'-
w� Date
F; Assisted by NiA -------------
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a-� Project Engineer :_10NATHAN M. WHITTINGTON, PE
v Reviewed by: ..a'.� - � - �'"r - ��- - - - - - - -. - -
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