20190821 Ver 1_Haywood County - B401 - Hydro Report_20190618

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Design: Discharge
Base Flood: Discharge
Overtopping: Discharge
INFORMATION TO BE SHOWN ON PLANTS
WS EL. Taken
@ River Station 9345
-- 2400------ c.f.s.
Frequency _______25-------- yr.
Elev. ------
2994,4--------
3400 c.f.s.
Frequency -------100_-_____yr.
Elev- ____-_2995.4------
ft.
---4600------c.f.s.
Frequency 500+/----- r
Elev ,------
2997.5.......
ft.
'OVERTOPPING
WOULD
OCCUR
@ STA.13+56
ADDITIONAL INFORMATION AND COMPUTATIONS
USGS DISCHARGES FOR HYDROLOGIC REGION 2
- LEVEL 111 RURAL BLUE RIDGE ---SIR- 2009-5158
DRAINAGE AREA = 12.2
SQ. MI.
FEMA PUBLISHED: DRAINAGE AREA = 13 SQ. MI
-
---
0.736
---------------------------------------------------------------------
Q'o
288
(DA)
1800 CFS
3580 CFS
----------------------
----------------------------------------------------------------------
-
025
398
(DA)
2400 CFS
NOT PUBLISHED
----
0.71e
-------------------------------------------------------------------------------------------
Q50=
479
(DA) =
2900 CFS
5880 CFS
--------------------------------------------------------------------------------------------------------------------------
0.na
Q,N=
575
(DA) =
3400 CFS
7080 CFS
----------------------
064._7--------------------------------------------
04
-------
___Q300=
_ 794
------------------------------------------------------------------------------------------------------------
(DA) =
4600 CFS
10510 CFS
--------------------------------------------------------------------------------------------------------------------------
ABUTMENT SCOUR: 50yr. (NCHRP 24-20 EQUATION)
YO----7.64_F----------------------------------------------------------------------------------------------------------
Yl -__ 6.9-8 FT______ ____ __ _
q- _ Channel Discharge /Channel Width - 3219.46 /48.15 - 66.86 SQ. FT /S
q2c = Bridge Opening Discharge /Bridge Width - 3200 /51.75 = 61.84 SQ. FT /S
g2C/q, = 66.86 / 61.84 = 0.92 , a = 1.2
------ - ---- -- ----- - -- ---- - - - ---------------------------------------- -------------
V7
Yc-IY1(g2l/q,)] = [6.98(0.92)�] = 6.53 FT
----- ---- 0 -- -- ----- --------
Y.-a(Yc) = a[Y,(%,/q,) ] = 1.2 * 6.53 = 7.83 FT
Ys Y,, Yo =Ys=7.83 7.64 = 0.19 FT
-------------------------------------------------------------------------------------------------------------------------
HISTORICAL FLOOD INFORMATION - LUCILE HERON, LOCAL RESIDENT, HAS LIVED IN THE AREA FOR 68 YEARS.
--------------------------------------------------------------------------------------------------------------------------
BRIDGE DOES NOT OVERTOP FOR REGULAR STORMS. HIGHEST WSE NOTICED IS 2.0' BELOW THE BRIDGE.
--------------------------------------------------------------------------------------------------------------------------
DURING LARGE STORMS DEBRIS WASHED DOWNSTREAM AND BRIDGE MIGHT HAVE BEEN OVERTOPPED
--------------------------------------------------------------------------------------------------------------------------
____________________________________________________________
DESIGN FOLLOWS SUB REGIONAL TIER GUIDELINES
------------------------------------------------------------
Drainage Area __ 12 2 SQ MI
River Basin FRENCH BROAD
SITE DATA
Source _____ __STREAMSTATS /WAYNESVILLE
Character MOUNTAINS /REGION 2
Stream Classification (Such as Trout, High Quality Water, etc.) .________"_'-" 1, """"
Data on Existing Structure TIMBER FLOOR ON STEEL I BEAMS WITH TIMBER CAPS /TIMBER POSTS & SILLS
SINGLE SPAN @ 40'-8"-------------------------------------------------Total Waterway Opening
------- --- - g Y P 9 276 ------ s.f.
Waterway Opening' Below 100yr. WS EL. ___276------- s.f.
Debris Potential: Low__X--- Moderate -------- Hi h______
Data on Structures Up and Down Stream
US: 430090-51' PRESTRESS CONCRETE CORED SLAB, 0.5 MIN JCT SR 1240
DS:430087-110' POST TENSIONED CONCRETE SLAB, 0.5 MIS JCT INC 215
--------------------------------------------------------------------------------------------------------------------------
Design Control Elev- __________-2998 0_________ft. (COR. EFF. 100-YR WSE @ RS-9345)
Gage Station No, -_________-__NONE Period of Records ._____________ WA Y
Max. Discharge -_________ WA ___________ c.f.s. Date __________ WA________ Frequency WA
Historical Flood Information:
Period of
Date_ 2004 Elev._ 2994_ft. Est- Fre .. ��0__ r.Source ________LUCILE HERON 68
_________ q y ___Knowledge________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 ------ ------- Contraction ------- -____ft. Local_t.
Channel Slope ---- 0.018 FIELD SURVEY 2988.7
fift Source __ __________ Normal Water Surface Elev- ____ _____ _ ___ft.
Manning's n: Left O.B.0.05-0_09 -Channel 0.035-0.045Right O.B.0,05-0.09__ Source ._ FIELD SURVEY
Flood Study/Status _______ _____ DETAILED -STUDY- ------
(4WO12) _______ Floodway Established$.... YES_____
--- -------
With Without
Flood Study 100yr. Discharge __ 7080 _c.f.s. WS Elev.: Floodway___ 3002.1_--- ft. Floodway ..... 3001.4.... {.
@ River Station 9345
DESIGN DATA
Hydrological Method ______ SIR 2009 - 5158
& USGS RURAL REGRESSION /FEMA FIS
Hydraulic Design Method. HEC RAS V4.1.GtittleEastForkPigeonRiver.prj
Floods Evaluated: Freq.
Q
Elev. Backwater Bridge
Opening
Velocity
(yr.)
(c.£s)
(I (ft.)
(f.p.s.)
@ River Station
1800
2993.5 0.4
10.3
_Q10__ ____
9345
-----
Q25_ ____
_2400 -----
__-_2994.4 ----0.6_ ----------
17.3
_ ____
Q50 ____
2900
____2994.6 0.7 ____
9.8
--- Q100-----------
3400 -----
----- 2995.4 -------1-4---------
7-3
FEMA Q100 -------
7080-----
----- 2997.6 --- ---0.0 ----------
8.5----------
---- Q500---- -------
4600 -----
----- 2997.5 --- ----2-4 --------
5.6
Waterway Opening Provided BelowDesign W.S.
Elev.._-_313__s.f.,100yr W.S. Elev. _358... s.f.,Total____
358 s.f.,
Average Channel Velocity (Design)
------ 10_a__f.p.s.
Average Overbank Velocity (Design) ...........
?•4---- f.p.s,
Computed Scour : General ._____0-19
------ ft.
Contraction -------------------- ft. Local __---_--_----
ft.
Is a Floodway Revision Required?
_ ____ YES,
MOA 2A
=__._=-
,
BRIDGE SURVEY & HYDRAULIC DESIGN
REPORT
Y
O
N. C. DEPARTMENT OF TRANSPORTATION
1 '
I_
DIVISION OF HIGHWAYS
HYDRAULICS UNIT
I
RALEIGH, N. C.
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fin,
ow:
I.D. No._SF-430401 Project No. ________ 17BP.14.R.174--_-___ Proj. Station
----------- -
_______ 13+26 -L-
------------------
Fee:
CountyBridge Over LITTLE EAST FORK PIGEON RIVER
Bridge Inv. No ------ 401----
wZ
-____HAYWOOD
BROWN HOLLOW RD
LITTLE EAST FORK RD
On Highway__ _____ �_SR__ 1236) PICKY LA ----. an ----------SKY ANE
--------- Between -- LANE
SR 1129)--------------
(-
low;
Na
Recommended Structure _ 55' SINGLE SPAN, 21' CORED SLAB WITH VERTICAL ABUTMENTS
v
'
---------- -- -------------------
10' LANE WIDTH 2'-5" SHOULDERS, 24'-10" CLEAR WIDTH
Recommended Width of Roadway____________?T OUT TO. OUT BRIDGE -WIDTH
Skew ____ 90_________
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W O I Designed by: ---------------------'-------------------- --- - -----
PARSONS
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Ga; Assisted by: ----------------------------------------------- WSI' I WWWKERMW
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o Project Engineer :NA RANA STANSELL, PE, CFM 434 Fayetteville Street Suite 1500
- - - -- Raleigh, NC 27601 - 919.836.4040
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N Reviewed by: �_ - __ -1-- - LICENSE NO. F-0891