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ADDITIONAL INFORMATION AND COMPUTATIONS � SITE DATA : ;
' Drainage Area _ 530 ACRES USGS QUAD MAPS ' ��
: - - --------------------------- so�rce --------------------------------------------------------...------- ? ��-; CULVERT SURVEY & HYDRAULIC DESIGN REPORT �'
DRAINAGE AREA - 530 ACRES, BROA� RIVER_ BASIN, USE NCD�T RURAL DISCHARGE_ � River Basin ._BROAD_ ____ Character ..RURAL (MOUNTAINOUS) __ �� N C
---- - ---------------- - -------------- --------- - - ' � � ; . DEPARTMENT OF TRANSPORTATION
CHARTS C 200.1, C 200.2, C 2Q0.4, AND C 200.5; SHAPE CORRECTION _FACTOR = 1_25, i Stream Classification (5uch as Trout, High Quality Water, etc.) ._C; Tr _ _ __ _ ' Y'; DIVISION (�F HIGHWAYS
------------------ - -------- -- ----------- - ------------------ -------- -------- - � w � H T
COVER CORRECTION FACTOR - .7 HC - 8 __ _ � Data on Existing Structure __SINGLE SPAN TIMBER BRIDGE ON I DEAMS (1@18 8'); 7 BED TO CROWN u; YR�,qLEIGHSN_ CN�
--------------------- --• ------------- ---------'- - ---- -------------. ..-- -- ...----------�---- - -
� Total Waterv✓ay Opening_.... 4$:�_____s.f. Woterway Opening Below 100yr. WS EL..._..35_�__..s.f. ' ��
--------------- ' � p :
_..."""-"-' "-'-'----"'-'--'-":'--_-'-""""'-'/ ""---------------_'-""-'-"----------"-'-"""-'--"" •
Q5 Q5o X 39 480 X 39 1$8 cfs USE 190 cfs ; Debris Potential: Low❑ Moderate� High❑ �j I.D. No..__SF_740197 ProjectNo. ._______17BP_14_R_117 Proj. Sta9ion _._____.__-L- 12+97
------- - ---------- ---------------- - ------------ - ---------------------- -------------------------- ---------
: Data on Structures Up and Down Stream UPSTRFAM: NONE ; � i POLK UPPER TRIB OF OSTIN CREEK 197
Q io 45o X 53 480 X 53 255 cfs, USE 260 cFs : -------- - ------ ------------------- � ------- --------------------- , � , County --- -------------.. .--- Stream ---------------- -. . . ------- -------- -- --------- Stru. No ------------
Q25 - 450 X.76 = 480 X.76 = 366 cfs, USE 370 cfs
Q 50 - 481 cfs (ADJUSTED), USE 480 cfs
___.____.Qtoo_- Q5o � 1•z� = 480 X 1.21 = 582 cfs, USE 600 cfs
._Qsoo - Q5o X 7.80 = 480 X 1.80 = 866 cfs, USE 850 cfs
- - - --- -------------. .. _.._-----------� - ------------------- - ---------- --------------- ------------
-------------- -- ----------- --------------- - ----------------.... ---------------------- - -----------------------
-----------------------------------------------------------------------------------�---------------------------------------------
NC7TES:
THE ALUMINUM BOX CULVERT DOES NOT FLOW FULL. ACCORDINGLY, THE ABC IS MODELED AT
ITS TRUE SPAN WIDTH.
THE EXISTING BRIDGE HAS AN EFFECTIVE AREA OF 48J SQ FT
THE PROPOSED ALUMNIUM BOX CULVERT HAS AN EFFECTIVE AREA OF 62.3 SQ FT
DOWNSTREAM: 740196-SINGLE SPAN YIMBER BRIDGE (1@2Q'7") (.8 MI W JCT SR7170) ' �'
----------------------------------------�----------------------------------------------------------------------------------------... ; a' On Hi hwa SR 1142 US 74 SR 1170
, � ; 9 Y--------------- - - - Between -------- - -- - - - -- and ...---------�-----------------------------
• o . -------- - -- - - - - - - -
Gage Station No.NO GAUGE IN VICINITY period of Records _____________________wA______._____...____._yrs. ; �; ALUMINUM BOX CULVERT; SPAN=22'9", RISE=5'4" W/SKEWED ENDWALLS
. LL, Recommended Structure ----- --------- - -------------------------------------...__.... .
---- --- ----- ------------
Max. Discharge------------wp------------- c.fs Date.-----------wA---------•-- Frequency--------wA-------- � �n�;
� o : - - - - --------(-------------'-------------�------------------Slc-�-----------------------------
----------------------------- -- - -- -
Historical Flood Information: ; ��; 20' EOP to eoP 100
RANDY RAMSEY Period of ; o.; Recommended Width of Roadway__ ...................................................... e._......._..._._....._....._
DatQ_____-___._, Elev._1294:$ft.Est. Freq.. 10+ yr. Source __NCDOT - DIV 14 Knowledge._.�$__yrs. ' ^
Period of : �; Recommended Location is (�,��Be�sn) Stream from Exis9ing Crossing..AT
---
Date------------ Elev.-------...ft.Est. Freq. -------yr. Source -------------------------------------------Knowledgg--------Yrs. ; m
; LL Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier �
Allowable HW Elev. .��gZ.Q3__(EXISTING__ 100__YR WSEL}t, Normal Water Surface Elev. _,_. 1293_8 {t,
AT RS 1161) FIELD i � Bench Mark is CONTROL POINT BM#2: -BL_ STA: 7+88:00 (29' RT); NAIL IN BASE OF 5"
Manning's n: Left O.B. _.:�8.: �__. Channel.._045 Right O.B. :�8-:�� Obtained From _.OBSERVATION ; ;
"""""""" ' � MAPLE (@-L- 13+17 36 42 O7' R� 1298 93 NAVD 88
� �� ------------- - ------ - - - --- ---- -- -------- --------- Elev. ----. . __.._.ft. Datum: ------ ------------
Flood Study/Status PIONE------------------------------------ Y Z----wA --- ---
............. Floodwa Established. __.._.. � a� STAGE CONSTRUCTION
WithWithout i v� Temporary Crossing -------------------------------------------------- ------------------------------------------------------
Flood Study 100 yr. Discharge .__wA__. c.f.s.; WS Elev.: Floodway .._..w'°`......ff. Floadway _._.. �A_____ft. ; m;
�:
DESIGN DATA ^' � , - F �
; Z , `„ ` � _,
Hydrological Method __NCDOT RURAL DISCHARGE CHARTS (C 200.1� C 200.2� C 200.4� AND C 200.5) j v �' �+ C-x' �°`� �'������h �
--- --------------------- ----- - -- --------------... . ..---------- ; .o -. �� u ., �� , ,.� � , ,, ' � ''�'r_•.�,
HECRAS VERSION 4.7.0 740197 UT OSTIN CREEK SR7142, r' � �= "' ' �" " g
Hydraulic Design Method --� --- - - -- ---------------- �-------- .._ P.1�... .---------- ---- � �ui�..=w y . -g.��I'
: 2.4 2.5 ----2-� �'�-----2.83---ft•% Q ---- 3=0-------fr. ' o; �e+.�'��' nr$ ��_. � � � �: -r ° ,� :
Design Tailwater (�s ---------�--ft'� Qio ---�-----ft'% Qss oo soo
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InIeT Control Outlel ConTrol N, `,y� ��.
Q Remarks � -- ° -
Size & Type (c.f.s.) Ke HWiD H.kW. d� dc2D ho H �So Hft'. o , ��� ,I
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Is a Flaodway Revision Required?.-----------w:e`------------- TotalProposed Waterway Opening-----.62_3-----s.f. ; � I ;;n���'�zj . � " � "'' I
_ . i� . - ;-z _
OutletVelocity (V�o) -------------7_2._.----------f.p.s. Natural Channel Velocity (V�o) -------------6.7 ----------{.p.s. ; ; ��•,,,nrrrr,-,r
: : .�``.�N CARp�'!''��,^
Required Outle4 Protection __CL,455 I RIP RAP ON BANKS � O Y� PAUL CAMERON PE c��^��r°`�pe$g �° ^a�'q��
------------------ -------------------------------- --------------------------- --
w•
Design: Discharge ------190 _ . c.f.s.
Base Flood: Discharge .__._ 600 _ c.f.s.
Overtopping: Discharge ...__ 260..__. c.f.s.
� BE SHOWN ON PLANS i��'' Designed by- ------------------------'-.._.----- DaTe � 1e I� �,r�o``�" I�2 �. '?
-----------------
�� ROGER S. WE�4DON, PE -�---- ---------- � • Q 9r .�
@ River Stafion 1731 i � Z; Assisted by: ---------- - -------------------------- a
----- --------- "
Frequency.--------- 5------_.__yc Elev. ----------1294_9----------�• : a �; ��� : � 1656 � �
', ProjectEngineer : ROGER S. WEADOiV, PE � ; ��
� o; ----------------- - - - -------------- F Q� ;
Fre uen 100--------- r Elev. 1295.6i -------.ft. ; � __ 4 P':,;�GINEF',•' ��'
------------ • ---�---------------
q `Y-- Y , E %%�� T ,�- F _�Mo EngineeriNg `%,�c ••..... . O v
, � Reviewed by: .----=---------- -- --- �-=r-�=-----------._ �� SULTA �d� FR EP� �``
Frequeney..--------�o-----�---Yr. Elev. ----------1295.1---------fi• ; <n �ZS�/S vna�v�hivi.ozm�e sw�e�s��, 9r1929>03]) ��� �i�sn�Wu�����