20211104 Ver 1_Jackson County - B144 - Hydro Report_20210813

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SITE DATA ..
ADDITIONAL INFORMATION AND COMPUTATIONSen
Drainage Area 2.1 SQ. MI. Source USGS QUAD: WHITTIER
0. CULVERT SURVEY & HYDRAULIC DESIGN REPORT 6�V
HYDROLOGY River Basin LITTLE TENNESSEE Character RURAL RESIDENTIAL v..) N. C. DEPARTMENT OF TRANSPORTATION `l
DA = 2.1 SQ. MI. Stream Classification (Such as Trout, High Quality Water, etc.) C `" DIVISION OF HIGHWAYS t\1j11
HYDRAULICS UNIT
FE USGS ce
FROM USGS RURAL REGRESSION EQUATIONS FOR DISCHARGES GES DISCHARGES Data on Existing Structure . 1.@20'.k.1)MBEK FLOOR ON .SALV, I-BEAMS w RALEIGH, N. C.
(USED FOR E.BTS TIMBER CAPS/TIMBER POSTS AND SILLS AT VARIOUS CENTERS w
REGION 2 (BLUE RIDGE) PER USGS SIR 2009-5158 COMPLIANCE): (USED FOR DESIGN): Total Waterway Opening 63 s.f. Waterway Opening Below 100yr. WS EL. 63 s f. w
Q10 = 288DA
°736 = 497 CFS SAY 500 CFS (,;Z10 = N/A Q70 = 500 cfs Debris Potential: Low❑ Moderate■ High CI I.D. No. SF-490144 Project No. 17BP.14.R.150 Proj. Station 12+57.50 -L-
•0724 Data on Structures Upand Down Stream UPSTREAM: NO COMPARABLE STRUCTURE O 490144
Q25 = 398DA ' = 681 CFS SAY 700 CFS Q25 = N/A Q25 = 700 cfs a County JACKSON Stream NATIONS CREEK Stru. No.
- DOWNSTREAM: NO COMPARABLE STRUCTURE (NORFOLK SOUTHERN RAILROAD 330 FEET DOWNSTREAM) Z SR 1397
Q50 = 479DA°'718 = 816 CFS SAY 800 CFS = = -.4-
Gage On Highway.(THOMAS VALLEY ROAD) Between SR 1399 and SR 1510
Q50 N/A Q50 800 CfS
Station No NONE Period of Records ►`1/A yrs. 0 2 @ 11' X 5' RCBC BURIED ONE FOOT WITH 6" BEVELED HEADWALL AND
or13o• Recommended Structure ( )
Q1oo = 575DA ' = 976 CFS SAY 1000 CFS (�100 = 1212 cfs G21oo = 1000 cfs v
794DA°704 = 1339 CFS SAY 1300 CFS Max. Discharge WA c.f.s Date N/A Frequency N/A v
Q500 = BAFFLE AT 23.5 FT. SPACING ON CENTER FROM OUTLET END IN RIGHT BARREL LOOKING DOWNSTREAM
Qsoo = N/A Qsoo = 1300 cfs
• Historical Flood Information: � 26' CLEAR FROM FACE TO FACE OF GUARDRAIL
0 Roadway32' SHOULDER PT.TO SHOULDER PT. 47a
SEPT. Period of N Recommended Width of Skew
DETAIL Date 2003 Elev1865+/-ft.Est. Freq. 10+ yr. Source DOWNSTREAM LOCAL RESIDENT Knowledge 30 yrs. -a.
Period of 4 Recommended Location is (Up-, At, Existing Crossing.
(NOT TO SCALE) Date...WA..... Elev.1 4 .+/,-•ft.Est. Freq. 10+ yr. Source UPSTREAM LOCAL RESIDENT Knowledge 50 yrs. a
MULTI- BARREL CULVERT 1867.66 (EXIST. 100-YR WSEL - Nr Statewide Tier ❑ Regional Tier El Sub-Regional Tier II
Allowable HW Elev. SECTION 677 USED) ft Normal Water Surface Elev. 1861.9 ft LL
LOW FLOW CHANNEL S I LLS 0.05 TO FEMA MODEL/ LL Bench Mark is BM2 (BENCHMARK IN 12" SYCAMORE TREE)19' LT OF -L- STA 12+71.58
AND FLOOD PLAIN BENCH Manning's n : Left O.B. 0.05 Channel 0.045 Right O.B. 0.06 Obtained From FIELD REVIEW o 1866.51 NAVD 88
FEMA SPECIAL FLOOD HAZARD ZONE AE / Non-Encroachment N 629340 E 714938 Elev. ft Datum:
*NOTES: Flood Study/Status LIMITED STUDY (FIS DATED 4-19-10) Established? YES 0
1) NATIVE MATERIAL BETWEEN SILLSBAFFLES Flood Stud 100 Dischar e 1212 With 1870 5 Without 1870 5 Temporary Crossing NONE REQUIRED - OFFSITE DETQUR
IN THE CULVERT SHALL PROVIDE A Y yr. 9 tc.f.s.; WS Elev.: Non-Encroachment ft Non-encroachment ft 4
CONTINUOUS LOW FLOW CHANNEL. NATIVE @River Station 672
d_ a`1 ¢3'°r !• r r ! y..r. .nee 5
f r3l z v t
MATERIAL CONSISTS OF MATERIAL THAT IS DESIGN DATA h. ' '» t�^'� � `r > �� 4
EXCAVATED FROM THE THE STREAM OR l � 3 4---" '13-1' -
'
CONSTRUCTION.
AT THE PROJECT SITE DURING -11'-'•I �1 . ,� v{-t (:' t S ,�y
CONSTRUCTION. ONLY MATERIAL THAT IS USGS RURAL REGRESSION EQUATIONS - REGION 2 t -a� s
(USGS SIR 2009-2158 & FEMA 100-YR Q) o +e k' { i
EXCAVATED FROM THE STREAM BED MAY x .- 9' < I Hydrological Method Z �� •� , ,� t , ,
BE USED TO LINE THE LOW FLOW CULVERT A.i 2' L< ", !,y ; n,. ^ 't � M,
BARREL. RIP-RAP MAY BE USED TO SUPPLEMENT Hydraulic Design Method HEC RAS VERSION 4.1.0 •o ' • w N# !e ;„: • , ., f ', .' , z•
THE NATIVE BED MATERIAL IN THE HIGH 1863.4 1863.8 1863.9 1864.2 1864.6 a. , ,P . , c�.- ,
FLOW CULVERT BARREL(S). IF RIP-RAP IS Design Tailwater WS (Top) , J, ;
USED TO LINE THE HIGH FLOW CULVERT Design Tailwater Depth (Bottom): Q 3.1 ft . Q 3.5 ft . Q 3.6 ft •Q 3.9 ft ; Q 4.3 ft :� t 1`
BARREL(S), NATIVE MATERIAL SHOULD BE PLACED l0 ' 25 ' 50 ' 100 500 -
ON TOP TO FILL VOIDS AND PROVIDE A (Depth taken from culvert outlet sill elevotion 1860.3)
FLAT SURFACE FOR ANIMAL PASSAGE. NATIVE 5.0' �r -.
Inlet Control Outlet Control 3 "j` �. ,, X'""�
MATERIAL IS SUBJECT TO APPROVAL BY H.W.Qemarks v r f
THE ENGINEER AND MAY BE SUBJECT TO HIGH SILL HW do dc+D h H LS H.W. a- is y. 7,, f• +'
PERMIT CONDITIONS. Size & Type (c.f.s.) Ke HW/D (ft..) 2 0 0 ({t.) cn t a a j *,
µ
2) SILLSBAFFLES ARE TO BE 1.0 FT.WIDE,CAST • SEE HEC-RAS FOR Z ",1.it,,f$> :F u ''
SEPARATELY AND ATTACHED BY DOWELS. 2 0 2 0 ANALYSIS ', 0�"Wit,
3)TOP OF LOW FLOW SILLSBAFFLES SHOULD
FLOWH CHANNEL OFD STREAMIOTHA WEG LOWt t t 3 ': �, cW- •, r 1 i ,.i
• MIN.1..
•
4) DO NOT SET ELEVATION OF(HIGH SILL BAFFLES SILLS AT ° M � errt {
ABOVE BANK FULL. INLET AND OUTLET •
5) NUMBER OF SILL/BAFFLES DETERMINED BY THE
> 0'4 ts,..„',.?,,,,' ,01, i,',(1 4., $,,,,,,.._,..40141,;-: ' .'=., ,-a.;1,,,-.-,
ENGINEER.
� .�` H '• '.' Utz.
�TB--TB TB -TB Is a Floodwa Revision Required? YES, MOA TYPE 2A Total Proposed Waterway O Opening 75 s f �-0,,, sg'` 1`'"
_ L BAFFLE ___ -- Y q p Y P 9 v s4v e of v < - ` _ ''. . x.s.-t s:
rr-tnt.�£o _ -1 r SILL SILL -I V - LvrEo D
---/ Outlet Velocity N ) 8.3 f p.s. Natural Channel Velocity (V ) 5•8 f.p.s. N
'go �S$ ? aWa o o8D8a"yy"o �_ / to , , %/� •
�� s a° a '-'4''0 0°8 a o og o ° ` saa �-___--_- Required Outlet Protection CLASS I RIP RAP W/GEOTEXTILE (BANKS ONLY) se 0/-M ETHERILL •' v.,�• ,RO.:...../,/'•,��.
o LCLan 'o 0 o`�L4}1A/ ° o ��A� �"° � ^'- tL by: . . pF N
ti w Designed - ENGINEERING •• � ��• �S$I� •,L'9 � .
INFORMATION TO BE SHOWN ON PLANS Date q
u •MATTHEW HARVEY •TB BACK FILL WITH NATIVE MATERIAL TO _ WS Elev. Taken @ River Station 677 Assisted by: • SEAL •q. ` • _ ,
SILL HEIGHTry7 TB Design: Discharge 700 c.f.s. Frequency 25 yr. Elev. 1866.7 ft Z = 3 1977
•
N. O Project Engineer KEVIN B. ALF RD PE
ra -•••I r I- - I v I-- •ce Base Flood: Discharge 800 c.f.s. Frequency 100 yr. Elev. 1867.6 ft Q
FLOODPLAIN SILL Z Reviewed by: - .. ,�••f'••F••••- -• �'•:�N B. A�.��••,
BENCH WR BENCH WIN 1866.4 ft E /z/r/ /K ,�`,✓G
COIR FIBER BENCH W/ •;1EOvertopping: Discharge 700 c.f.s. Frequency 25+� yr. Elev. •�'���`" '"'��
MATTING NUMBER OF BAFFLES=1 COIR FIBER ° r
ON 23.5 FT CENTER FROM DOWNSTREAM SILL MATTING �E OVERTOPPING OCCURS AT STA. 11+50 -L- +/-,AT THE ROADWAY EP n /"
PLAN VIEW 9A3