20160770 Ver 1_78 0033 2016 SF 780033 HUFFINES MILL CREEK SR2359_20160808

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ADDITIONAL INFORMATION AND COMPUTATIONS
t1SGS SIR-2009-515A REGION 1
lA_YR-------@32----..559.�F5---------------------------�--------------------------------•--------------------------------
25 Yft-----�14-- --�9Q.GFS.---------------------------------------------------------------------------------------------
S0. Y[t-- ----87k_.=---4524_GF�--------------------------------------------------------------------------------------------
1R0_ Y�-- ---lQ3R._=---l9QQ_ CF�--------•---------------------------------------------------------------------------------
50Q_YR.=_. i_414__=..7400_CES.-----------------------------------------------------------------------------------------
---------------------------------------------------------- -- - - -------------------------- • --------------------------------------
SCOUR AT OPEN-BOTTOM CULVERT: 100yr. _ _ _
------•----
0.18 U3 0]6 O.RB ✓! Oi6
Y = Ku (Qoi) [(Q/(W���Dso) j Y - 0.84 (123) [(1000/�32)(0.7) j= 9.7ft
--�`-- - ------------------�=------------------------•--------------•-----------------------�-----•----------
-Y --------- -Ys-9J 5.6 - 4.lff
-Ys.-Yrong--9------- - - - ------- ------------------- - ------- - ------ - -------... .. -------
CONTRACTION SCOUR• lOAy.r.------ --- - --�--... -----oai--------------------------•--------
YZ- Y� [Qz/Q�1--�VJ�/W=]---- - -----------------Yz- 5.5 [787.5/841J] [30/18.7] _ 7.Oft
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Ys= Y-Yo Ys= 7.0-5.1 = 1.9 ft
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SITE DATA
Drainage Area l.h_S.Q,.ML------------------_------ Source .USC�.GI�1AD_ MAP /DASS...--_--------•------------------
River Basin R9ANQK�---------------------------- Character R41_RAL------•----------------------------------------
Stream Classification (Such as Trout, High Quality Water, etc.) �_________________________ _ .___..____.__.
1@19.3', 1@18.5' (OAL=37.9') TIMBER DECK ON TIMBER JOIST W/STEEL 1-BEAMS
Data on Existing Structure �Q�y�qE7�A6U71r1�I�lTS,MAS&.G.OJ�LGRESE_PJFJ{___________________________________________
Total Waterwny Opening.__.__274_____ s.f. Waterway Opening Below 100yr. WS EL.,.___ 9)..___.s.f.
Debris Potential: Low � Moderate � High ❑
Data on Structures Up and Down Stream I�PSTREAM; NONE________________________________________________________
D.OWr1STREAM:.C�NFkUENCE. WITti._LITfLE.JA�Q9S._CREEK------------------------------•--------------•----------------
Gage Station No.NQ�1E--_-------------------- Period ofRecords �.yA--------_-------_---------------------Yrs.
Max. Discharge[�YA-----------------_-....c.fs Date�A------------------------- FrequencyLYA----_--_-------
Historical Flood Information:
1' BELOW Period of
Date__g-4-q4__ EIev.STE��.__ft.Est. Freq. SQQ...yr. Source �ARl,_�QL1.1NS_________________________Knowledge.__]]_._yrs.
Period of
Date-----------. Elev.--------- ff. Est. Freq- ------- Yr. Source ---------_-------------------_---•---_ Knowledge -----._yrs.
Allowable HW Elev..MA?CH..OR.RE4_UCE.IQOYR.`NS�L__.___._. ft. Normal Water Surface Elev. ._._ 89,9._..._..fF.
Manning's n: Left O.B. ._0.12__..__ Channel. 0,05__.. Right O.B. _ 0,12_._ Obtained From FIELD..REGQN_y._
Flood Study/Status �IOT.lt�1.FEb1A.57URY.AREA____________________________Floodway Established?I�A.___..__.
With Without
Flaod Study 700 yr. Discharge TyA_______ c.f.s.; WS Elev.: Floodway [�A.____,__..ft. Floodway PYA__.____.__.ft.
DESIGN DATA
Hydrological Method llS�S__SIR_2Q09_Sl�B.REfzlOrl-J------ - -_----- --_- ----------------------------- - - - -
Hydraulic Design Method tIE�=RAS.VER_S.Q.O__p7.RP.7.&49.H1lEFIL�tES_MILL.SREEK_SR23541 ... .............__ _.
Design Tailwater � Q ---3.8------1t.; Q _4.2---}t.; Q ---- _- -.Jt.;Q ---5.0 .St.; Q -_5.9 -----.ft.
la 25 -- 50 700 "'" 500
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Is a Floodway Revision Required?�TUAY_AREA______________ Total Proposed Waterway Opening.___._�25_.___s.f.
Outlet Velocity jV � 8.8________________________f. s. Natural Channel Veloci
io ----p• � �io� A.B----------------------f.ps.
Required Outlet Protection CLASS 'll' RIP RAP
INFORMATION TO BE SHOWN ON PLANS
WS EL. 7aken @ River Station 4065
Design: Discharge __.._700.___. c.f.s. Frequency._..._..._2.S___._._._yr. Elev . ............$k:l.___.__.__.ft.
Base Flood: Discharge _____109Q_____ c.f.s. Frequency.____.___.���_.__._..yr. Elev_ ____________87,03__,___.__.ft.
Overfopping: Discharge _.___l4StQt__. c.f.s. Frequency__.___.__.50Q+__.___yr. Elev_ ____________43 2__________ ft.
'Overtopping @ Sag Siation 10+94
ROANOKE RIVER BASIN
NOT IN STUDY AREA
CULVERT SUR�/EY & HYDRAULIC DESIGN
N. C. DEPARTMENT OF TRANSPORTATION
DIVISION OF HIGHWAYS
HYDRAULICS UNIT
RALEIGH, N. C.
REPORT
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I.D. No.SF-7�Q0�3--_--- ProjectNo. 17_BP.7.R.te4_...__------------- Proj. Station .1Ot37_-l-_-------------_--
County RQCKU�LGHAM---------- Stream HUFFIN�S_ MJI.!-. CR�EK --•------ ------------------- Stru. No.33_ ------,-
On Highway.SR.2359----------•----- Between SR.231b--------------- and S&.23hQ-----------------------------
Recommended StrucFure �2'X_a'.3-SIAED._PRECAST_CllLYER7.AN__�AST-IbI-PLAGEFQQTINGS________________._
tv---'----""""----"-""'--'--•----..._._._""--"'-""-"'-'-'_"'-"-"-'-----'.....--""--"'---"""'--"'-"'-
oRecommended Width ofRoadway.32.FT_SP-SP,24.ELGR-CxR ...................... Skew_._84�.__._._..._._.___...
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� Recommended Location is (Up, At, Down) Stream from Existing Crossing . .. .... .........AT_..__..___.._._.
�= Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier �
d Bench Mark is TBIvU.57A,9.+4�G5,.38�7'RL_RftSPtKE.IN..l9".NICJSQRY.7REE---------------------------------------
; Elev. ,___100:00____ft. Datum:.,_..A$SUMED,____
<r� ------------------ ------ -- ----------------------..._.----------
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�; Temporary Crossing NOT REG2UIRED----------------------------------------------------------------------------------
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u+ , Date ----------- - � =
LLw: Assisted by: Rr1E.RCH.JRH-•-------..--------------------- � -d��"F�� r_ �
LLw. SUN6ATEDESIGNGROUP,P.A. = - g334 = -
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= v, Project Engineer : N/„ y��Y Y�F.I1.5, JR P E �� � e,s aoNEs Fw,�K��� aoAo ��- C�� � �
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� N RALEIGH.NORTHCAROlMN2]WA � %l�d. :G`�� �.�°l
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o Reviewed b . __.... �XI- .............. ..... . . .. �a��v� ��iiini�� ��'j ti
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