HomeMy WebLinkAbout20190908 Ver 1_Haywood County - B276 - Hydro Report_20190708INFORMATION TO BE SHOWN ON PLANS
WS EL. Taken @ River Station 364
500 25 2971.3
Design: Discharge c.f.s. Frequency .______.__________..yr. Elev. ______________-_------,ft.
Base Flood: Discharge ---- .--- 750--- ------ c.f.s. Frequency ._______100-------- yr. Elev.,,,,,,2972:4 ft-
Overtopping: Discharge---- 2050--------c.f.s. Frequency ....... >500 „yr. Elev- ------- 2976.3........ ft,
*OVERTOPPING WOULD OCCUR
@ STA.12+25
ADDITIONAL INFORMATION AND COMPUTATIONS
USGS DISCHARGES FOR HYDROLOGIC REGION 2 - LEVEL 111 RURAL BLUE RIDGE - SIR 2009-5158
-----------------------------------------------------------------------------------------------------------------------------------------
DRAINAGE AREA =
-----------------------------------------------------------------------------------------------------------------------------------------
1.4 SQ. MI.
0.736
-
a
288
DA
- - -
=_ 370 CFS
- - -
0.724
Q25=
_ _
398
(DA)
= 500 CFS
------- --------- --------- ----------------------------------------------------------- -
o.ne
Q�e=
479
(DA)
= 600 CFS
0]13
Q100=
575
(DA)
= 750 CFS
-----------------------------------------------------------------------------------------------------------------------------------------
0.704
Q5m =
794
(DA)
= 1000 CFS
- -- -
ABUTMENT SCOUR: 100yr. (NCHRP 24-20 EQUATION)
-----------------------------------------------------------------
Y�y=a(YcI=aC�1(9z�q,)�1----------------- YMm, c)=1.2[3.37(23.7334.95)�I
----- ... .........
-
Y Y=2.90-2.67 = 0.23 FT.
s------------------------------------------------------
Y-0--=---7=67-FT,-----------------------------------------------------
-Y1--= -3-3-7 --FT
---------------------------------------------------------------------------------
ql = V*H = 10.37*3.37 = 34.95 SQ.FT /S
- -------------------------------------------------------------- --------------
q2c = V*H = 8.27*2.87 = 23.73 SQ. FT /S
dd --------------------------------------------------------------------------------------------
Yc [1 (g2Zg1) ] - (3.37(23.7334.95) ] = 2.42 FT
a = 1.2
Y.=a(Yc)= 1.2 * 2.42 = 2.90 FT
HISTORICAL FLOOD INFORMATION - BOB SURRETT, LOCAL RESIDENT, HAS LIVED IN THE AREA FOR 50 YEARS.
BRIDGE DOES NOT TYPICALLY OVERTOP. TYPICAL HIGHEST WSE NOTICED IS ABOUT THE LEVEL OF THE BOTTOM
OF BRIDGE DURING A TYPICAL STORM. THE BRIDGE OVERTOPPED IN 2004 DURING HURRICANE FRANCES.
----------------------------------- ----- --------------
DESIGN FOLLOWS SUB REGIONAL TIER GUIDELINES
----------------------..._.-...-._.. - - ----------------------------------------------------------------------- ----------
SITE DATA
Drainage Area ..... -------�•4 SQ MI Source QUAD MAP CRUSO
-------------------------------------------
River Basin FRENCH BROAD MOUNTAINS /REGION 2
---------------------------- Character - -------------------------------------- -
Stream Classification (Such as Trout, High Quality Water, etc.) ----,-- , WS-III, TROUT
--------------
Data on Existing Structure TIMBER FLOORS ON I -BEAMS, END BENTS: TIMBER CAPS /TIMBER POST AND
SILLS AT VARYING CENTERS, SINGLE SPAN @ 25'-6" Total Waterwa Opening 79 s.f.
---- ------ - Y P 9
Waterway Opening Below 100yr. WS EL. ...... 79........ s.f.
Debris Potential: Low -. X---- Moderate ....... -.High.__ _
Data on Structures Up and Down Stream _________________________________________________________________________________
US: NONE (DRIVEWAYS)
----
----
-------------------------------------------------------------------------------------------------------- -------------------------
DS; CONFLUENCE WITH EAST FORK PIGEON RIVER (0.85 MI. DS)
- - - ---------------------- - -....... --------
Design Control Elev. ._.------ 2973:6 ft. (EXIST, 100-YR WSE @ RS-364)
Gage Station No. „ -,NONE
Max. DischargeWAc.f.s.
Historical Flood Information:
Period of Records ------...... - - WA,,,-,- „ __-,-, , --------- yrs.
Date ........... wA--------- Frequency --- --- WA
Period of
Date- 2004 Elev-._2973 ft.Est. Freq..100-__yr.Source
,,,,,,_„-,--BOB SURRET_T-------------
-Knowledge__50-----
yrs.
Period of
Date --- ----- Elev ------ --- ft. Est. Freq. - -- _---yr.Source
------------------ ---------------------
Knowledge ----- _------
yrs.
Period of
Date___ ----- Elev.....-.....ft. Est. Freq. __ ____yr.Source
---------------------------------------
----- Knowledge _.__ .-.-Yrs.
Historical Scour Info. : General ---- -------
..ft. Contraction ------- 7-- .... ft. Local ------
- ------ ft.
0.049
FIELD SURVEY
2967...
Manning's n: Left O.B----- 0.05 Channel
---- 0.04 Right O.B..... 0.05 Source
FIELD SURVEY
Flood Study/Status _____________NOT IN A
- --------------------------------
STUDY (04,032012) Floodway
Established$...._WA.._..-
With
With
Without
Flood Study 100yr. Discharge --- w?`-----c.f.s.
WS Elev.: wp----- ft.
Floodway ______wp......
ft.
DESIGN DATA
Hydrological Method
SIR 2009 - 5158 & USGS RURAL REGRESSION
-------------------------------------------------------------------------------------------
Hydraulic Design
Method ___,
HEC RAS V4.1.0 /BurnettCreek11-;prj
Floods Evaluated:
Freq.
Q
Elev.
Backwater Bridge
Opening
Velocity
(yr.)
(af.$)
(ft.)
(ft.)
(f.p.S.)
@ RiverStation
Q10
370
2970.7
0
8.2
364
Q25
500--------
9713
----2--- I—-----
-- �
8=�-----------
-----
- ------
------- 600 ---------
----- - -- -----
- - -------9..
----
Q7 - -----
------- 750 ---------
2972.4------
-----0----- ---------
9------
0500
...........
--2973.4----.-
-------
9I-------------
Waterway Opening Provided
Below:Design
W.S. Elev----- 69--_.s.f.,100yr
W.S. Elev.._-95__-__s.f.Total__._147,
s.f.,
Average Channel
Velocity (Design)
...... .9:0--- ,f.p.s. Average
Overbank Velocity (Design) ------------
:0----- f.p.s.
Computed Scour
: Total
,,,,_-0.23,,,,,,__ft.
Contraction
..__..-.__----------- Local _______________________
ft.
Is a Floodway Revision Required? ....... --__ NO
-------------------------------------------
BRIDGE SURVEY & HYDRAULIC DESIGN REPORT
IV
N. C. DEPARTMENT OF TRANSPORTATION �J
DIVISION OF HIGHWAYS
HYDRAULICS UNIT 11�
RALEIGH, N. C.
I.D. No.SF-430276 Project 17BP'14.R-176 11+98.67 -L-
------- Pro ---------- ------- -------------- Proj. Station --------------------- -----------
County -- -_B
HAYWOOD Bridge Over ______WHY ___ WORRY Bridge CREEK g 276
__LVD _ __________________ MASSIF RD a Inv. No.
RD __------ ---
-BURNETTE COVE
On Highway.--.- (SR 1104) SR 1103 SR 1130)
9 Y - Between - - - - and . ( -------------------------------
Recommended Structure SINGLE SPAN 45',21" CORED SLABS WITH 4'0" ABUTMENT CAP
--
------------------------------------------------------------------------------------
- - - - - - -
24-10 CLEAR WIDTH
Recommended Width of Roadway-....-_32'-O" OUT TO OUT BRIDGE WIDTH _ Skew ____.__-__. 60
Recommended Location is ( Up, At Down Stream from Existing Crossing ------ 24 FT_ DOWNSTREAM
- -----------------------
Statewide Tier ❑ Regional Tier ❑ Sub -Regional Tier ZI
Bench Mark is BM_1:_RR SPIKE 32" SET IN CHINESE CHESTNUT" @_ N637053 E 859158
STA, 10+10.77 -L- OFFSET 83 Elev. 2984.08' ft. Datum: NAVD 88
Temporary Crossing STAGED CONSTRUCTION
o:
V;
zDesigned by: VIDYA_MOHANDAS,_PE----- -..................
71
Assistedby: ------------ ---------- ----_---------------------
E Project Engineer : _RANA-STANSELL, PE, CFM
� Reviewed by: ;;?a
Date
WSP 1PAIWOM
434 Fayetteville Street Suite 1500
Raleigh, NC 27601 - 919.636.4040
w .wspgroup.wm
LICENSE NO. F-o891