20190089 Ver 1_940083_2017_BSR_20190116

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SITE DATA
INFORMATION TO BE SHOWN ON PLANS USGS STREAMSTATS �;
� Drainage Area _________ 1.2 SQ. MI. Source _____________USGS_QUAD__MAP_"ZIONVILLE_2016"____ ' r'
WS EL. Taken @ River Station 591 -- "'; BRIDGE SURVEY & HYDRAULIC DESIGN REPORT
: ; �.
Desi n: Dischar e________460_________c.f.s. Fre uenc 3551.4 ft ; River Basin ___________NEW RIVER Character ___________ RURAL MOUNTAINS
J 9 q Y-------- z�---------Yr. Elev. -------------- . -------------------------------------- ; v't
�, N. C. DEPARTMENT OF TRANSPORTATION
Base Flood: Discharge ________¢5Q_________c.f.s. Frequency ________100________yr. Elev. ______3553._4___________ft. � Stream Classification (Such as Trout, High Quality Water, etc.) .___________C;_TR; ORW_______INDEX_ #10-2 _�1) ; >� DIVISION OF HIGHWAYS
� � °�� HYDRAULICS UNIT
__________ft. ' Data on Existin Structurel @ 18' 6 TIMBER FLOOR ON TIMBER JOISTS E.BTS; TIMBER CAPSPOSTS & CONC. SILLS � �
Overtopping: Discharge --------460---------c.f.s. Frequency --------��---------Yr. Elev. ------3551.4 ; 9 ------------------------------------------------------------------------------------------------ ; 3; RALEIGH, N. C.
: . � Z,
� _____Total Waterway Opening ______54_______s.f. '
. -------------------------------------------------------------------------------- S f ; ,c�
: Waterway Opening Below 100yr. WS EL. _.....�4.._..._ •• ; �� 940083 176P.11.R.118 12+09.0 -L-
� Debris Potential: Low._______ Moderate ____X___ High ______ ; O; I.D. No____________________ Project No. _________________________________ Proj. Station _________________________________
ADDITIONAL INFORMATION AND COMPUTATIONS � � •�
: Data on Structures Up and Down Stream .______WA_UPSTREAM ' � County ______ �NATAUGA_________ Bridge Over ______._ N._FORK_ NEW__RIVER__________. Bridge Inv. No.____083_____
. ------------------------------------------------------------ ' w; SR 1340
' ___________ 940211 DOWNSTREAM: 20'8" TIMBER FLR. ON I-BEAMS LOW FLOW BRIDGE ; On Highway______MF-�4T GAM RL?, Between _ and __
�; SR 1300 SR 1341
------------------------------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------------- -- P- ----- ---------- -----------------------
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__________________________ RURAL BLUE RIDGE � ; �i; Recommended Structure ___________1_@__ 30'_ 21"_ PCCS_ ON _ 4' CAPS
------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------- �� ---------------------------------------------------------
SIR 2009-5158 ; 100 YR WS ELEV. AND MAINTAIN�IMPROVE 10 YR- LEVEL OF SERVICE � ��
---------------------- -�-------------------------------------------------------------------------------------------------- : Design Control Elev. .----------------------------- ft. ; o� ------------------------------------------------------------------------------------------------------------------------------------
----------
0.736 . �
Q�o 288 (DA) 334 CFS (SAY 330 CFSJ : WA WA ; �� Recommended Width of Roadway____�7_67' CLEAR ROADWAY (30' OUT TO OUT) Skew _____ ��0 _DEG.________
------------- ---------------------------------------------------------------------------------------------------------------------- � Gage Station No. ----------------------------------- Period of Records ----------------------------------------------Yrs. , o,
0.724 ; ,
Q- 398 (DA) = 460 CFS ; Max. Dischar e______________wA____________ c.f.s. Date _______WA WA � �� Recommended Location is ( Up At, Downj Stream from Existing Crossing,_____________________________________
--------------------25 ------------------------------- g - quency --------------------- � Q'ar
o.�,a ---------------- re
Q= 479 (DA) = 552 CFS (SAY 550 CFS) : � `� Latitude _________36_34856________________ Lon itude ___________-81_68225___
___________�Q____________ , Historical Flood Information: , ------ 9� ----------
- ---------------------------------------------------------------------------
0."3 � NEVER OVERTOPPED, NO ROAD CLOSURE Period of 0
_________Q,00 =__575 DA = 663 CFS SAY 650 CFS ' _________. Elev.__________ft. Est. Fre Source _ DAVID SCOTT BMS BOONE N.C. �g Statewide Tier Regional Tier Sub-Regional Tier
l) ------ �--------------- �------------------------------------------------------------------- : Date q. ._...---yr. ---------------------------------- Knowledge---------- Yrs. ' a. O O �
o.�oa � Period of ' �
_________QSoo 794 (DA) = 914 CFS (SAY 900 CFS) � ; °r; Bench Mark is _ BM__#1_____N_ 956546__E_1210200___-L-_STA:13+09_6_ 38_8' RT_8" SPIKE _IN__12" MAPLE_TREE_____
--------------------------------------------------------------------------------------------------------------------- : Date --------- Elev.--------- ft. Est. Freq. --------Yr•Source ........_............_.....----...---..... Knowledge.------....yrs. �
� Period of � ��
� � r' ----------------------------------------------------------------------- Elev. ---3554.92--- ft. Datum: --- NAVD_ 88 ------
------------------------------------------------------------------------------------------------------------------------------------- : Date--------- Elev.---------_ft. Est. Freq. --------Yr•Source .--....._............_............_....... Knowledge----------Yrs. � �;
------------------------------------------------------------------------------------------------------------------------------------- : Historical Scour Info. : General------ ------�. Contraction------- -----�t. Local..._...----...ft. �
�; Temporary Crossing _ ON SITE DETOUR
. ABUTMENT.SCOUR: 100 yr. (NCHRP 24-20 EQUATION) � ; Channel Slope _ _ _ _ 0 _0548_ _ _ _ ft�ft Source _ _ _ _ _ _ QUAD _ MAP ft, � , j � �
•..:. �-�
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--------- Normal Water Surface Elev. -------3548--------- ; Z ��� - ��, '
: ,_ , : '�'�` . '��r. � ' *
------YMAx-a(Y�)=a[Y�(q2C/q�) ] Y� 1.2(3.1) 1.2[2.25(19.8fx24.99) ] ----- --------- --- ------- ` �
---------------------------------------------- -------------------------------------------------------------------------- : Manning's n: Left O.B. 0:08.-0:1.._Channel _..0:065.._. Right O.B. _0,03-0.12 _ Source _ SITE EVALUATION ; � ,a `:���� ���5�,� � ��''.��
Y -Y -Y Y =2J0-2.36 0.3' � � ���"ce � �Y-�.� ��-y,. '�, �.--- _��- � �--
s Mo.x o s ; Flood Stud /Status NO FEMA STUDY FOR THIS SITE ________ __ Floodway Established?_____wA______ ' ; � �,� -�F -t _� , ,:
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Yc 2.25 : Flood Study 100yr. Discharge - c.f.s. WS Elev.• Floodway - _ft. Floodway -....ft. ; °0' �- `�-� r ; f' ��� ,� '7'` '�
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1 = 460 cfs /18.41 ft = 24.99 cfs�t @ River Station �; � � � � '�:� : � '� �',, � �_ � ` _ �+��
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q2c = 460 cfs /23.16 ft- 19.86 cfs�t DESIGN DATA o -L- � _
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---------NOTES:---- - --- - -
DESIGN FOLLOWS SUBREGIONAL TIER GUIDELINES
THIS PROJECT COMPLIES WITH LOCAL FLOOD PLAIN MANAGEMENT REGULATIONS
NO STRUCTURES WILL BE ADVERSELY AFFECTED BY THIS PROJECT
DESIGN MAINTAINSIMPROVES LEVEL OF SERVICE
� USGS REGIONAL REGRESSION EQUATIONS 2009-5158 100% REGION 2
. Hydrological Method ------------------------------------------------------------------------------------------------------------
� Hydraulic Design Method____________HEC-RAS V.4.1.0
Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity
(Yr.) (c.f.$) (ft.) (ft.) (f.p.s.)
; @ Ri 591Station ----- ��------- ------- 330------- ---- 3550,9----- ---- 0.6---- ----------7.6-----------
� ------2�------- ------- 440------- ---- 3551.4----- ---- 0.6---- ----------8.3 -----------
'""""�Y_'"""
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------55II------- ---- 3551 _5-----
------ b5Q------- ---- 3553_4-----
---- 0.3----
____ 1,15___
"'"'"'""'"O.O "'"""""""
----------5.2 -----------
------ 90Q------- ---- 3553,8-----
---- �=16---
----------6.6 -----------
Waterway Opening Provided Below:Design W.S. Elev. __56 8___s.f.,l00yr W.S. Elev. . 96,1....s.f.,Total ._96,1..._s.f.,
Average Channel Velocity (Design) _____�_3_____f.p.s. Average Overbank Velocity (Design) ________�_3________f.p.s.
Computed Scour : General _________ ________ft. Contraction .________0•3 ________ft. Local .________wA__________ ft
Is a Floodway Revision Required? _____________ WA
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S�� I 025 Watle Avenue
Raleigh, NC 27605
Tel:9t9-789-9977
E N G I N E E R I N G 8 Fax'.919-789-9591
C 0 N 5 T R U C T I 0 N Licens2: C-2197
Designed by: _____
Assisted b PAUL SHEPARD
y� ---------------------------------------------------
Project Engineer : ______BRIAN _ A_ MAZZOCHI,_P_.E_________
ReviewedbY� --------------------------------------------------
Date ..0�92018._._.
����i�N' C A R p� ��,�
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6/19/2018