20210299 Ver 1_Macon County - B236 - Hydro Report_20210614

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SITE DATA
INFORMATI•N TO BE SHOWN ON PLANS
WS EL. Taken @ River Station 522 Drainage Area 5.51 SQUARE MILES Source USGS QUAD MAP 0-'6 \f ��
RIDGE SURVEY S3 HYDRAUL U C o ;,SIGN .REPORT
Design: Discharge 1400 c.f.s. Frequency 25 yr. Elev. 2283.6 ft River Basin LITTLE TENNESSEE Character RURAL MMM' ` i,,:
N. C. DEPARTMENT OF TRANSPORTATION 1,,1 \
Base Flood: Discharge 1900 c.f.s. Frequency 100 ye-. Elev. 2284.5 ft Stream Classification (Such as Trout, High Quality Water, etc.) . C " DIVISION OF HIGHWAYS `
6 HYDRAULICS UNIT '' '
Overtopping: Discharge 1900 c f.s. Frequency +/-100 yr. Elev. 2284.7 ft Data on Existing Structure 1230'-6"; TIMBER FLOOR ON I-BEAMS o RALEIG1-I, N. C.
c.5
NOTE: EXISTING LEVEL OF SERVICE IS BEING MAINTAINED.
Total Waterway Opening 151 s.f.
Waterway Opening Below 100yr. WS EL. 151 s.f. m
Debris Potential: Low Moderate ___ ___ High I.D. No. SF-550236 Project No. 17BP.14.R.156 Proj. Station 13+76.00 -L-
ADDITIONAL INFORMATION AND COMPUTATIONS z LEFT PRONG
Data on Structures Up and Down Stream a' County MACON Bridge Over BURNINGTOWN CREEK Bridge Inv. No. 236
SR 1396 DEER CROSSING SR 1392
NOTE: BED MATERIAL IS BOULDERS, COBBLES, SAND AND GRAVEL US: # 550340 SR 1396 18.67 FT 1 SPAN, TIMBER FLOOR ON TIMBER JOISTS On Highway RAY CREEK ROAD Between ROAD and UPPER BURNINGTOWN ROAD
(.4
BANKS ARE VFOETATED AND STABLE DS: # 550127 SR 1387 35.6 FT 1 SPAN, TIMBER FLOOR ON I-BEAMS 2. Recommended Structure 45' 1-SPAN, 21" DEEP CORED SLAB WITH 4' END BENT CAPS
MAINTAIN OR IMPROVE EXISTING tti
AND RIMR\P_A$IOTW.[NIT PROTECTION
Design Control Elev. LOS AND 100 YR WSELft.
0
Gage Station No. N/A Period of Records 1\/ yrs Recommended Width of Roadway 27'-10" CLEAR ROADWAY WIDTH 130' OTO) Skew 105 DEGREES
M
RURAL BLUE RIDGE Max. Discharge WA c.f.s. Date WA Frequency N/A ,2• Recommended Location is ( Up. Down) Stream from Existing Crossing. AT
o
SIR 2009-5158
Historical Flood Information: �- Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier 1
Q5= 209 (DA)0'4v = 750 (SAY 750) Date - Elev NEVER - JEFF ROBERTSON Period of ®L. Bench Mark is BM-1 NAIL IN 12" POPLAR
4.
ft Est. Freq. yr.Source Knowledge 33 yrs.
0.736 OVERTOPPED BRIDGE MAINTENANCE SUPERVISORPeriod of so
Ln -L- 12+52.84, 27.94' LT Elev. 229®_3_ ft. Datum: NAVD 88
Q10= 288 (DA) = 1011 (SAY 1000) Date Elev ft.Est. Freq. yr.Source Knowledge yrs. cs
0.724
Q?5= 398 (DA) = 1369 (SAY 1400) Period of Temporary Crossing STAGED CONSTRUCTION
Date Elev ft Est. Freq. yr.Source Knowledge yrs.
0.718
Q5_0= 479 (DA) = 1631 (SAY 1600) Historical Scour Info. : General N/A ft. Contraction___-_WA_-__ft. Local N/A ft. N
0.713
Q 575 DA 1941 (SAY 1900) n W
1Q4- ( ) = Channel Slope _Q�Q25 ftfft Source I�IO[?QT_SURVEY Normal Water Surface Elev. . 227.6,0 ft. Z � `., � • ;�� ., ..; �` S ;" '��N. y
0.704 4" i ° ,i `y"L f; ?3 t�
Q 794 (DA) 2640 (SAY 2600) 'a �,. s.
500= = Manning s n: Left O.B. _ .04 Channel _--_0,04 Right O.B. ____0rQ6_---Source _FIELD__QBSERVATION___ - , , it!
, , r �. db.
Flood Study/Status UNSTUDIED (EFFECTIVE FIS DATE 4/19/2010) Floodway Established2 NO o, '' �' ' *‘ .t' ` ' �° ` �"
NCHRP Scour Computation (100 Year): With Without
Flood Study 100yr. Discharge__NA____c.f.s. WS Elev._ Floodway IsVA ft. Floodway N/A ft. o . " ;
@ River Station ? .,
yl = 4.8 I
al = U'S Channel Discharge = 801.0 = 36.4 DESIGN DATA T . .
• l
I A ,
U/S Channel Width 22.0 - "'•
Hydrological Method RURAL FLOOD-FREQUENCY EQUATIONS (USGS SIR 2009-5158); BLUE RIDGE REGION ® ,, '
q2 = Briidge Opening CI = 1900 = 45.2
Bridge Width 42.0 "g Hydraulic Design Meth C-RAS_.4.1.4_(5 Q2 6 LT PI�QN�i__8URNINGTC>1KN.-GR K__SR1396� '- '
6/7 N F fit•
Yc = Y1 (g2/g1) )= 4.8(45.2/36.4)�)= 5.8 Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity ® .. ,
(yr.) (c.f.$) (ft.) (ft.) (f.p.s.) _
@ River Station • ,
522 10 lOQO 2281.9 Q 5.7
g2/g1 = 45.2/36.4 = 1.24 2.5 1400 c
DESIGN 228 �6 1�1 6.8
v
Alpha from Figure 8.10 (HEC-18) = 1.2 .-
50 16Q0 ��_83-q l,l__-- 7.8 �,
..
Ymax = 1.2 * 5.8 = 7.0 100 1900 2284.5 1.5 9.1 ��ftQ�UoaDa
y0 = 6.3' S0Q 260Q z Doc
(JO ��� CAR Op.•� op
-22_85--8 -2,2 10,9 J`p(; °°
SHIRSHANT SHARMA, P.E. �, 5E6Ad04kAE46 . 1:-
Waterway Opening Provided Below:esign W.S. Elev. -_20..-_s.f.,100yr W.S. Elev. 205 s.f•,Total 205 s.f., 1- z Designed by: SEAL
ys = ymax - y0 = 7.0-6.3 = 0.7' SAY 1' z Date VI0/2017
Average Channel Velocity (Design) ____5.8------f.p.s. Average Overbank Velocity (Design) 8.6 f.p.s. m Assisted by: DILLON BAWAYAN 0 040590 a a
P °° . C o
NOTE: CONTRACTION SCOUR IS INCLUDED IN NCHRP METHOD OF CALCULATING ABUTMENT SCOUR. Computed Scour : General 0 ft Contraction 1 ft. Local Q ft. a Project Engineer : NIKKI HONEYCUTT, P.E. �� .!'°°° �G I N� �° Q�
Is a Floodway Revision Required? N/A en Reviewed by: r_ � �__ � %1�a/�k 7 1