20201570 Ver 1_Macon County - B343 - Hydro Report_20201113

.■.n. ■: ..... :': _ . ::'.ICI ..........u'1 .n�"�'CC::' - '.' pas •':::: :':':: �J El. n■ .. - :u■■. , , .,_ _I ; ---=T ; ':mil:1144:100.1•111.1:::::::.
______IW .. ..nl■ .: ..:
1
■U ■■■ W : :.....1 I - ■.■... ...... '■■■P_- _- CC■ EE mna■ ■ E • . ■ •• ■= u n■ ■:. ■■■ , ! _ .�':.. '■'■■: 1--_-= ■■n . n. :.... . .
. ■. ....... :. ... E I �i n■■■■.■ 4...„ . u■n■n • ■■■■■■.0 MUM U�_ xD of of A' ���a: . ■ . .a�i ■
' n■U■ I _ - ■■■■ .....min "um: =. S C'9u■■. ■u.tta. _ ■■n■ I I _ E : :.. •■■■n ■ a z5° h3;�01�n ■■■■n■■■ ■■nn n■■■ ': p� (W311 vd 1V fl I D la
' : UUUUUUn = u ■ ■ _
•
■ ■ LEANf1 ■ •■■■■■ W■■ C■■a �_.._ ■■■■�:■ I ba 1b21n1�n�31s)' L ...._ ■■ ■ ■ ■ a■■■■ ;- j .� d _dI II s5 SNOI,l _` ■ •■■■■■■■�■ n■:■■ Uu■'n'UUUUU 9 i -_...
E n:. ..a ■ uW■:C■ ■ U ��■ , r • NOi s9 ls3 C ■: C ■■■■■ ■■ J�Iz Iz T313 1• U.
■ ■■■■■ :' a ■ ■■■■ n ■ .■ _ ■ I
.. W.:: . ..:. 999E.::C:Ca:a...E. - _ N.:E .n. - : = ► - ...... -- 9 •UUUU■u■■:■ ..:Eaaa:aa■: ':N■ a■.■■ . n .n■■ .n.■. W
■U limu:::■ . u.n...a1. ....E o
N :■ ■■ ■:■ : L :■un■ ■■n ■■ --=-- ��od i :U,r Ld3I Nos a■■■ ■ ■mu,,,'., ,- : "u'::C.UUUUU•UUUUUUUUUU
....11 :■■u: ■..■■■ ■ _ . ■■■ ■.■■■■ ■ ■.. ■■■ ■.nn.■■■■ ■ • 'q._•
■ L141 ■. :- -- '
W■ :a n _ . ■ ■!..■ _ - II-'� I • : U: "Eh U •■ UUUUU ::U000U:N::
■n■ ■n ■■U■■■ _ ■.n a ■■■ .■ �■■■u ■■ ■ pom. . 1 ■ 'Tannin■■.n■■ ■ n : ■ ■n. CCL_-.._ .■:n■■�r ':.n ..�- ■ ■■^ r 1 J__ ,-■■ -- ! •.; / '3i_ _ :■ .■ ■ .. ■ I
mg
U■m■. :91 ■■■ Ills . nn ■ ■ .n -� my - 1 ■L•-�_�■n� n
: :: : :■, ■ ■ I i r 9$E 7,,, TQ �' •UUUUUUU : 9L:ELe000UU 'nUUUU C :LULU UUUUUU UUU
■ ■ .■. ■.9U nUUU UUUUUUUUaa9UU .UU...'..U.■.11, :: •UUUUUUUU a' ; - r ! r -_ 't=� 1 -X-` �3 E M951! ■CULL CC:::■■■ n ■ ■ I 1 "■.E■■. L■■ ,-= �
■ fim■ W■■■ - _h_-!- ■ ■ ■wn■ ■ ■ .nr■■,-- ■_■■ ■■ u � _ �' , , . - ,�sz,��,ob � ;' '- � ..•i __ X 1 o■■_ -1 ! -- - :::C■n■■■ �■■■■n�■ ■.� ■ ■■ ■ r ; ■■ _ , � :: : � .� •- ::u■ui:
�_�.� n■UUUUUU: : ': ■ ■C.u: w . .. ■, ; . k ; ' _ ,... , , --, ;" - : ■ -_ 1_ : - . ■■ ■ - 1 .. .■ UU .. -
UUU ■■■■■ a . . .■■■ I ■i ___ ■■ ...,,to o� o. ,.. r N - I': a: : i I _ ' . r - : �1 C-.9 II . I , , - C.9-__ 9 ■■U'■.■.■u.■. . 9E .n . ... UUUUUU■: I U ■■ ■■ ■ ti_.:_._.- - ■ ■ �yi:t !w a %' wFzor ou�d R = ��.no 1- <- ! - _ 1 h- W ■ n■■ ■ ■ U■■ _ r a ■■ ■C■al: CN 1 �- Itt z -c�= - - 1_: �/f0;4 _ 1 1 1 1� Q� -- , , ,,S£ Mesln■:� ■■ : U ■ ■1D3fO id SIHi J.8 I - ��� -� - �,�� ! eittllll �' X X ■■u■■■ _ UUUU ■ Z U ■U■:■3d�v 1�13St13A4v 9 111M S3af11�nb1S ON
43iD 9■' n■ ��' �_ ..-.� ■ n -� ,�= j�►. a� ,o. i- n■ ■■■ ■■■■ ■ m ■■■■■
: .i .. - ',� wouwaxnwlsaaasfas ■■■Un U n ■ ■■ C ■■ ■a ■n■■■ ■■■ e!�¢M�� ■, ■■ ■■ _ _ //''/ate' @% ■ IR�,� r1 ■ ■C■� =- ' - � j/�.�fo sz�F N ��I■■O�1 ■■li��J 9 ■ ■ LI__ �■�C■ i I 1 ■■■■■■■■■■■■■■tit■® ■ ■n■■■:nUU ■ ■■■■■■_.I A �� _ 17 I e - N :■ .1._ _- _ . ISBA7i- _ -_ o a-os.A L rmr_s : �IM�® �ml , , I ■UUUUUU �n ■,■■ _., _�� UNN■
■C: :SC: a�:5-u ■.■_ o :/ r UU . ■ ■■n-- .. . 1 .. i , U■U■■: .■n■ . _ 1 ■ .■W■■..n
Nlv1da007dN�DO1nN IM1S3 dWOD 1�3r021d SIHi --III
'�■ne ■ ■ :■®■■�� •�•�^� � Illd■_: 1 \�� !ift ��rA1' ` 9/�i��jl WC( •!4 ,,'si _ � 1 91�h ■:�j� ■ �.1 UU■ i 1C N ■■UUn ■U - i 1
■■ WU• U _ III 7'i ,, �F, I ^s. •
:■ "L E . . SPa .. f . . ...Wn
•
■n { , ■■ .l i IP , ■ 1 ! I .■ : �' . b�� O1 .aaa.oal■. L _ .■��■u■.: I ' I : .1....11.1 . J
n■'::9■ -f ■■ aaa� .. , ■ . _ ■ elA■ .inn I r• ® _ �,r I -= L:::LL
111
,... ■■■■■■ 1 : �� ` C C":: 'E ■■ ■ ■ ■ ; .WW ppg/ _ I-■ ■■■■■■�■■ mom. .U■.W ■■�..■_ o 01 ■..:R
E Far• _ � n ■ ■■■'■niWn'�L■■ E9 dwnd o i'r' � ■■n NL ;■L ■ ■■"■�■��' / I •I / � �al�a "� ■■ ■ ■;:�:nNE
n■�W ■ n ■ ■ '■■■L ■■���■ _`_ ':■ ■ • '1 d�:■■■■■■ : .W _ _ ■ ■:n■■UU. ::■ ■: ::■ :■:E"E■ U ■ ► 1 0 I1SIx31 :.:■■ n.■ ■ : .. ■■■ 9■ :■ ' I 1 . . s, ■�� :: ■ :n■■■■■■: :: :■ ■ ■ ■
1
. .n:■ - 1 - ..: . W . ■.■u.n. ■■ ■■■. U1111111E ,� ■n ■ ll ■■.�'■.■ ■ IIIa .■■■■■■■ ■.nu ■■■ _ . :.. .../ .■a.■■■■■ :■.0 .. . : . ■ ■ ■: ■■UU - 'I :UCC� aC� .LN.■N■ UU `. - UUUUUU 9.■■■.. .. . .. ■■■■■■ . .
C13?11n0321 SWAG 7ID3a ON C �; ■■ U MU UU N •:EEC UE.=UL : a i A ■UUU■UPI :U
.■ p i :.L LUEU : ■a■W■.. .� n ....■■■. �� -X X . .W....n.. F.
. .. ■ ■■■■n. ■■ n.. .
■ ■ ■. .Ld Pre =av3ads . ■■■ ■■■■■■W / n.n.■■■ ■. ■ ■.nn .�■ nnn■ ■■.■■ n■ ■. a._. e •
■ ■LI U ■
'I■■ . ' C:: LLnU" :UUU. UU■■■. :=1:1:■n■nnW11 ' I. -._;11. ■UUUUUU ■■ ■L ■■■■u 'C::■■■■ m■■■UU C::'uW■■■■U'i■■ - a-a■■■:C ■ 4/ -_■ In:■:■■■. U■
■: ■ I ■■ id ZV . -H1aIM 21341nOHS 9 .■ ■ ■■ ■■■■■ ■ I ■ ■■ nn..■N ■C■ UU =-i ■ UUU ' UU■■ ■WN ..W-■n.:.nn : ■■:■n■ ■.■ _ ■■■. ■ W - - UU CUC■ L'■■■
■■: ■___-- _ : � ■ ■■:■n ■: :a x I , n
Wl} b0 0 3dO1S 55021D . n C■■:■■ . .-J -- ■ ■■■■■.■ . . I M' av i____ I LIMN .MU= �tItIN +,�. n■■■W■ .a E■ ■n■■E■ cn n -- !b _.■ ■� U■n
lY}! E00'0 -3dO1S 1vNlani1JN01 - - i ., � --- � "a
■ ■U.,U� zz'o =b ' I 1 ■ .W UUU : f - n■ •
: .■■ UUU UUUU .NUU.■ 41� o :U .:
C:....■ 6'0 NUCN:: nC:■W : 1 :CCC. . ..: . 'NNUUUUUUUUUUUU_= : _' C �' ' - _ UUUUUU' UUUUU ..: N■W. : - �N - -_ ■ W.
.■■.■ ..
� I b =1 .. ....... . . ... , 1 t _■.nn: ■ : U■■■ ■.iimU .■■n...■� .■:■ .■ 1 P 1 -'- :• L'.
i1199_ 0 90'0 =va __--wpm
':1"� 'i Ni'991111 "'� 11 1 . _ 1 li 1 E 1 1 1111 1 nl 1 l �� 1 -� •
s1sJ�1tlNfl av3�ds :p ■UUUUU UUUUUUn■ U UUUUU■nu■9 ■ •■ "°__ ___.� ■aW■ ■■ . Il �.■u 9 E ■■■UU - ■■� ■ ■w:aI�'4rr��`li000 E • I-I E ■
n.■ ■ •
! NC■■■ ■■■■W■■ ■ [ .. .n■ .WW■■. ^ l T 135MN.__ ■■■■u■. .■ : .. nnWW■:.■L. .■■.:: . ■ ■■■■►lti b U ■UU ■ , a p _. o ■
1 ' I 1 I 1 E :■..■■■:.■_, C■:: ■n■ ■ _-- '� ■ ■ -_ ..n.nW■n■ W.■■W ;_- :■:C■W■ ■ :■ •
W■■ ■:■■■L. :
.n _ _ _ UUUUU 131,ls� _HA ... ..... L'. ._ � .�.. W.. ... _ . . . .. . -_ .
L. 3OCID18 JO 3DVA sn WO)id 1d LE ■■ 11 ■ . MOM .■ . .- 3s -, L , . ■. I i I E:.C■ ■ • ■ ■■■■ �v --H z' ■
■■u■■.: ■ ■ ■■n.■ . _ ' . ��,,C-UUUUU zctz A - ■.:■. lcz €�■ ■ .■.■ II.:■■ : : 4 i
Wnn ZO ZEEZ NOIID3S fil I tt UU UU.■[•71I vAdax i ■■■ - f�®■ ■�:.n UUUUU U .n■. ■ _^ ■ ■ ■ ■ ■ ■■ -� - ■ ■ ---
uW 1. a3 I a ■W■■■ ■ E ■n■ ■■ ■ ■ ■ - �� ■.W 9�..■. I Z ■.■■■ ■ ■C■ ■■::- ■ F■ n U■.n I az 89zz 5A3 n■n■E :■� ■C:■■ .:n�i1■ _ ■ ■�.■■■■■ .� r .A5s ■U: - n 111■■W .■Wn .L .■■■ ■ . . :UUn■ I■ _ ■■ UaMI= "1'1, ■■■■■•1=11. :■■ ■■n I - ■.n. .I��i'■■■_ . -__ n■■■. O� I -; n■.■ ■a:■■■�■ ■ 9•UE.:■ ...■.■n ■■ L■n
■■■■..■.n EE'85ZZ 3nI1D3dd3 43103bb n..■.ttti. : �.■.■■■■■■u■n■ •. ■:C■W�.■.■ U •
.■n !Rig . ''
.■■ ■..■■■■ W. ■nnn■ !hill!
■
..■ ■n'. 89 L9ZZ 3A11D3�d3 31v�nina ■• ■ ■ ■ ■ .■■■nu■■■ ■■n\�. ■ UU ■- ,.'. r 11II 1 AI I �! `; air I I - a ■■
:■ ■ ■ ■ :.C■ ■ u ..n■■■ ___ _ ::■ a.DH', •�-- _ � ■■■n. .■■■■■:N r�'■■nu■■ .nnn IUDn■a■■■ ■ 9U: ■■■ ■:UUUUU ■ ■an::■■n ■■UU - 1 . i.. ..m��� :� -- r -.._._ I. • ..... . ■■■■■ ■ -- ■■■W: E Cn■■■W■ d C UnnN■■.N.N■.■nal � ■ C■■ ■'iRooLz n » >..■■■. ■ ■ ■ 1 I■'�v■■ 'imir: _ ;. I . ..... ;:iiiii
�j ....n99. nn... 1 .. .n.na �ii . ■■. .. :
.. .::. : ■■n'.':■: _imi• T II «, I i i 1 I , i i !T ■■ u■■■■ ■ ■■■. I ::�. ..... 1114
Trail
.. n�E ...
a ■ ■ ■ 318b1 3aNdVY210d2C3d nn■.■■ ■ ■■■. : _ ■ ■ •■::■ u_ ..: �a 1 -_ :n.n. ■:■ ■ .W ._ ■ p■■ :■ ■■■: W.a■■■:
ba:■a ■■. Wu■. rams - ,-- : .y■ _ ssga i-=-- i __' � �wrcg+� is�oCa+� - 'E n. U■ ■■ UUUUUU■ LI .■ ■ ■n■.■E■ _ .... ■n: .■. _ '� ---- ��__ --�-_. uW■: I�UUUUU ■■C9: - UUUU 11111111 .1� � ■■ 4UUUU:■n'■W:
UUU -- - �� ■n■. L:':a:N' I : i ; eisor ' i000Faf� i000sat� strca+�� •• UN ■ ■■
1 I-.. - - U Of--x-- -- I L9= N - rzf x. ■. ■ ■ ■■. ■ C ■ ■ ■■■■■■�. ■■ ■30(11118 AO 3D`73 sn w a-; .■NUU .U■UUI MHUU L A ■ UUU ��:■■u■ 111111111111111
■. �■ ■ UUIIL' � ■ ■ - ■■. n-_ : .o� ¢�� _ 06_ 0s = �n 9':.i�-�ib� : �� l L■EU UUO 3 1 lE _ z��za -73, ------ �.-sszz -73 3J(]lb8to'sszz-73' �r: ■.■ .■■ .■■■ W ■ n.■ ■ ■■ •1-, Zo'ZEEZ NOIID3S :. ■■:■ -' -is aros+zr =rd �„ .C�l is ■ UE I ■ E■■■. U ■ n U.■ �1�1 ilia �� - ' nn■
- X3 `'� ■ C ■■■■■■■ ■ �■u' _. oao�+tir rd-- oaos+sr, _J Ilsl .■. ■. ■ �,�. .. W■.■■ ■■ n���► I■_■■G■■ �E� _ n ■ZO'89ZZ L'LSZZ Z L9ZZ 8'95ZZ O3SOd021d N■:■ ■■.■■■■ ■n ■ C zz�szz 7a : ■. U■U ■■�■ ■ ■■u. ..W■■■■■n , U.:
■ - ....... .■.■n......:..NUU000 '�!e'm!'�1 N r ■■ . :U E.0 .■. �- : a U
-- 5 85ZZ OZ 85ZZ L 8SZZ 6 LSZZ 9 L9ZZ ONIISIX3 :■■■ mama _ . ■ _ : 3ovao axe 1_. I ■■U■ ■ ■■ ■■.::.■u■a■■ u■u■■■ ■W r 1..■■. ■■ WB■■■n ■■.L : .: : z n■ :
■.. . ■■■■■ 1 a ■.■ ■ ■■WUUUUU■.■.■■tta■. ■ I U.UUUU■■1 ■:■■ W■■■■■■UU15UUU�UU■:■■ . : UUUUUUU.�: UUUUUU 1 UUU : ::a
mu I ■C:■uU■U■■■I■■■■■■■■■■■■■■■■■W
005 a�aoL 09 UUU■ W U. ■■■■. ■■.■■■.Wn■ n■ ■■■ ■■■ ■ ■■ ■
m:_- LiA 5ZZ L6't'SZZ L ASZZ 6:AgzZ 9•JA01.Z 1`�21n1`VN T ■ LUU UC■■■ UUU■ L ZO':5ZZ UU■ 3SM 21A-00l :� ■ :::::■W■■N I 1•" ■■ C' N■.■■■_ ' UUUU UU -- _ UUUUUU:: UUUU I 1111111111111111111
.: __, - -_ _._r- ■...■■■ ■ ■ _ ■■ n■■■■■ • UUUUUU■ ■ ..■■■■■■ _ UU.UEnW.■ UUU.:■ ■ _ :1 :::■■■■U■ ■U U ■NUJlDN3fO3b3 ■ ::■■■nn . : - -::■■:: ■ ■■.n. .-■■ T. ■lJSCR�7. ■■.■.■■':W ■ ■.n.■■■ ■■ ■■■ ■■■■ n■ ■ ■■ ■:En . ... . : :- -- - .. ... .. .. 1 �- UUUL" 'admUU UUU ■'U: ip
■■..■..W ... . E . . :aC .■■ ■■■na 1 _■ 318V1 DNWR1Od�l3d =__ u■C'u ■U■: - - - ..■: ■.::■ U - 0i . : : 1 CC. ..■ ■■ ■■:■ ■ 9 L■:::■■ : _ -_- ■:■■■nn
■■■..■ r T n■ ■■■ .: sddD :a 3 T e I ':. .�+■' .�. ■■ ■� ■■ un. ■■■■ n■:■■■C■ a :■■ ■■ ■ ■ ■■n■■: U :_ ■� ■ ■*bow
■.0
10a N - E■ ..W■:: ::' a - L..�■■C �� i "i�.a�■UUU a ■■:■n. n.■ ■. 1 nUUUUUU■ ■. U..■■■ _ :: ::'n:.■■. ■ nn.:
I , , . . .EEn �' Wu■■uE za ► I .. ■■n■U _ ■ ■ . U ■■■ ■ -. :n ... : nu■■■ ■:■■.■.■: - :_., -
' ■■■■ I i , 1 . n.0 :.:.u•000 C , , 1 mourns I it i:in■a�n■ 1 1 : 1 •
00 5L 00 VI. 00 CL 00 i ZL 00 II
SITE DATA
INFORMATION TO BE SHOWN ON PLANS 5.9 SQ.MI. USGS TOPO MAPS (PRENTISS QUADRANGLE) 19� ' 10
WS EL. Taken @ River Station 2332.02 Drainage Area Source o BRIDGE SURVEY & HYDRAULIC DESIGN REPORT •�7,�
Design: Discharge 1400 c.f.s. Frequency 25 yr. Elev 2257.2 ft. River Basin LITTLE TENNESSEE Character RURAL
N. C. DEPARTMENT OF TRANSPORTATION
Base Flood: Discharge 2000 c.f.s. Frequency 100 yr.. Elev. 2258.02 ft. Stream Classification (Such as Trout, High Quality Water, etc.) WS-III; Tr DIVISION OF HIGHWAYS
HYDRAULICS UNIT
Overtopping: Discharge 1610 c.f.s. Frequency 25+ yr.. Elev. 2257.5 ft. Data on Existing Structure 1 @ 32', REINFORCED CONCRETE FLOOR ON I-BEAMS v RALEIGH, N. C.
W/REINFORCED CONCRETE ABUTMENTS Total Waterway Opening 131 s.f. o
Waterway Opening Below 100yr. WS EL. 131 s.f. 73 I.D. No. SF-550343 Project No. 14SP.20561.1 Proj. Station STA.13+25.02 -L-
ADDITIONAL INFORMATION AND COMPUTATIONS Debris Potential: Low X Moderate High a
M County MACON Bridge Over ALLISON CREEK Bridge Inv. No. 343
Data on Structures Up and Down Stream o
DRAINAGE AREA = 5.9 SQ. MI.
UPSTREAM: 550131: 1@30',WOOD DECK ON STEEL BEAMS W/CONCRETE ABUTMENTS "i' On Highway SR 1448 Between SR 1133 and SR 1128
USGS APPLICATION OF METHODS SPREADSHEET Ver. 3.1 DOWNSTREAM: 550216, 1@40', WOOD DECK ON STEEL BEAMS W/CONCRETE ABUTMENTS - Recommended Structure 1 @ 60', 24" CORED SLAB WITH 4' END CAPS
HYDROLOGIC REGION - BLUE RIDGE (REGION 2) M
Design Control Elev. 2258.20 ft. (100-YR REVISED BFE) A'
QLo= 1060 => 1100 CFS None n/a "' Recommended Width of Roadway 30'10" CLEAR ROADWAY (33'-0" OUT-TO-OUT) Skew 120°
Gage Station No. Period of Records yrs.
Q25= 1430 => 1400 CFS IFIS DISCHARGES Max. Discharge rya c.f.s. Date r✓a Frequency n/a Recommended Location is ( Up,(At, own) Stream from Existing Crossing. AT EXISTING CROSSING
m
Q50= 1710 => 1700 CFS (USED FOR FEMA COMPLIANCE) Historical Flood Information: V- Statewide Tier ❑ Regional Tier ❑ Sub-Regional Tier
JOHNATHAN BIRD "
Q,00= 2030 = > 2000 CFS Q100=2270 Date 2004 Elev. 2257.6 ft.Est. Freq. 50+/-yr.Source (LOCAL RESIDENT) nowd g 40 Bench Mark is BM#1 N 527433E 622544 STA. 9+92.11 -L- 23.55 LT.
Knowledge yrs.
in
QSoo= 2760 = > 2800 CFS Period of 8" SPIKE IN BASE OF 15" WHITE PINE 2258.12 NAVD 88
Date Elev. ft. Est. Freq. yr.Source Knowledge yrs. Elev. ft. Datum:
Period of N Temporary Crossing N/A - OFFSITE DETOUR
Date Elev. ft. Est. Freq. yr.Source Knowledge yrs. a:
Historical Scour Info. : General r✓a ft. Contraction nia ft. Local nia ft. v
Channel Slope 0.0086 ft/ft Source FIELD SURVEY Normal Water Surface Elev. 2250.6 ft Z
w
0.070-0.110 0.045-0.047 0.070-0.110 FI5 a t J ' ;'t �_? u �' 4
Manning s n: Left O.B. Channel Right O.B. Source o `
Non-Encroachment a rt`�: :
Flood Study/Status LIMITED DETAIL STUDY (EFF: MAY 4, 2009 REV: M9/2010) Established? Yes , .
Flood Study100 r. Discharge 2270 c.f.s. WS Elev.: With Without cam • :,(:a�i '`.:p444.‘i ,..', ,:v
Y g 2257.97 2257.58 0 ' i 1
OVERTOPPING ABUTMENT SCOUR (NCHRP 24-20 EQUATION): Non-Encroachment ft. Non-Encroachment ft.
River Station 2332.02 trl170 `` ",i";
Q1= 1244.32 :,
DESIGN DATA 2 yh � €�ry�� _
W1= 52.67 SIR 2009-5158 REGRESSION EQUATIONS (httpJ/water.usgs.gov/osw/streamstats/north_carolina html) o ` `V V . ,..
Hydrological Method
q1= QVW1= 23.62 Hydraulic Design Method HEC-RAS V 4.1.0 (550343.PRJ) m °C „ I �� ' '
Q2= 1318.40 Floods Evaluated: Freq. Q Elev. Backwater Bridge Opening Velocity ,l ,� , ,
(Yr.) (c.f.$) (ft.) (ft.) (f.p.s.) /- �
W2= 46.32 10 1100 2255.8 2.2 8.4 Z .+� ~ ,,. -...-" ., 4 . r .
@ River Station ,'` _ •
q2c= Q2'W2= 28.46 2332.02 25 2257.2 3.3 7.1 • � � 4.. "
1400
Y1= 3.88 50 1700 2257.7 3.0 8.5 cn 4! ):._.:. _"E`/'_ .,g,• M �M -44; *"
Yc= Y1*(g2c1g1)"(6/7)= 4.55 100 2000 2258.02 3.1 9.5
w �aa`�,nnnnC N�Neq{,Ririr,r
g2/gl=1.21 = > AlphaA = 1.75 Overtopping 1610 2257.5 3.0 8.1 �STa O�...,.,FESS�Iioi,, - /�\
THIS PROJECT FOLLOWS SUB-REGIONAL Z;• .-7 ,,
Ymax= AlphaA*Yc= 7.97 198 198 198 O VAUGHN & MELTON CONSULTING ENGINEERS
TIER GUIDLINES. Waterway Opening Provided Below:Design W.S. Elev. s.f.,100yr W.S. Elev. s.f.,Total s.f., �„ Designed by: 9 SEA L
_' Date APRIL 22,2016 - 033023
Y0=6.7 Average Channel Velocity (Design) 9.2 f.p.s. Average Overbank Velocity (Design) 2.2 f p.s. Q Assisted by: BRADLEY S. RIDNOUR, P.E. �' :J� k
Ys= Ymax - YO= 1.27 Computed Scour : General r✓a ft. Contraction Abut.Ys=1.3' ft. Local '�a ft. o Project Engineer HARDY WILLIS, P.E. y 4.-..ENGINEER.•'��/
Is a Floodway Revision Required? MOA 2A N Reviewed by: .f% ����i�h > �V 9k o,4aANU - 4,F6„� p