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by
st. Anthony FalltJ ~'~c!r{tl!lic l.ahoratory
UniVBX"'lSit;! of '~tnncBota
"!rector
Auguat 19,2
NOHTI~I~lfi ',wsr :; . :'~'. '~'.:1i' GO'WA"NY
!!i~!~~lte;; ··~_nn-A<l't ...
c 0 U' 'l' fO,/ P .. i'~ " . ~ .> -PllGfI!
T,ist of' !~l:':llreS • • • • iii
I. :LJTj ;",0- ~1.:: . ::-ro!-! • • • • • • • • • .. • 1
II. I :Yi):V\ fIT,IC ··~;l·;t Pl~:jI~.::·1·1 • • • • • • • • • 2
A. SAF St111in{; f~l!I.ein 'f).B~:n • • • • • .. • , 1'''1-.;~. Description of the ~Sodel • • • • • • • • • !] c. I,bvable ?ed Sediment • • • • • • • S
III. Tlf~~1T O;l·:}i./\TII) ;$ • • • • • • • • 5 Dr. Pl('f~r..;": JI't;\':'J f)" .... y:-' T"~~ Hll'}:,:i 'T/r.~~ • « 6
~,ari.os • • • 6 ;::erlcs n • .. 6 !3erios III • 7 ;)eries IV • • • • '" • • 7 "eri(~~'l V • .. • • • • n
v. 'DI~.,C:"~~!,t ::'.~?~;' I.;f n~;T '~~J; !:~r1"}~ ~.:, • • • I. • .. • • • n
Figure
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2
3
4
5
6
7
8
9
o Ii' --f',AJ' Stilling Basin nesign for 100,000 cf. • . . • • . . .....
SAF stilling Basin ~eeiu~ for 50,000 CfB • • • • • • • • • • •
fiize Distrl1:;ut1on o!'toclal nad nediment • • • • • • .. • • • • •
Profile of Original c;p1l1way .... • • • • • • • • , • • • • • •
}~rosion Pattern - Series I (Photographs) • If .. • • .. .. • .. • •
• • • • . . .. . , Rrosion Pattern - ~3eriel3 II (Photograph.)' ••
Erosion ('at tern - ~)eries III U'hotoLrraphe) . . , . . . . . . . ~~8ion Pattern - Series IV (Photograph.)
F;rosion Pattern ... Series V (r'hotogmph.)
i11
• « • • • • . .. .. . .. • • • • • • • • • • •
10
11
12
13
14
1S 16
17
18
In thl'l anr~.ng ot 1?:;2, tho 'i'!A.x:twmt'·:1(1!nsurcl~ (Hsr:~a.rp., of' tlil'
':1osisaippi. ltiver occurrS(: at t}o st. Mlthol't1 Falla, tia~.·\ 0'" th" "o:rth~rn
:.,tates f'owor i?'ompan~ a.t :in::1P:1l''101Js, 'lnntl!sota. As <oi result 0" -tTl:~; Lteh
flow, cO~191dflrebl0 rbl1!a,}" \'tIlS ~~o"ln t,e) tb'· !!Ipi.lhm.~; snrfacfI an": to tl.,~ rook
filled ori'o supportln;: t.ho str'lct'lf'P'. Tb;'~1"", od" 1. tp.sts 1Vf"lr~ :~ Tit. lat(l!(1 'f,"
the ,Jorthern :;tatpR 1'0' eX' COfflli!'l'lY to cleterni''l('l a hy(Jra'11ie l"e51L~n r"r It "true ....
t,nrA to l'l:!;")luCI) tbC! da'na;::~(~: sn1.11w~~~.()enus",' 0'" eO'1t.t"l~lA(' 1 ,1;-1 f'10l<: it has
honn tr~,mdl:le tt, c(")~')l.,.t" !\. !Illrv"":- t:lf tho I'3trl"~'r lmr; ~'(OlO'W t.!:~ cr,.~t or the
spil1vm.::. 'l'hereforp-, th" teaUnc; "lro;:.r:l~ L~Hl • ,p.{m 1i,-~.tp,~ to 0:m101"111f" the
11SP. of' t\ pl"Gvlc.:1s1;.' r':~velo'o(l 0l'>.StCIl for a f'lU 'Unr 'l-,asi.n.
':'}jp ~)t. A!~tl.ony :;~11h p,ni1lrm.;· Sr"rvp.s tt~ ')1l1"108A 0'" ~o'v'~,ct1'it;
f'loo,~ waters of' thf'l-isllisnln:~i !'ivl'r ovnr ,-,t. J\'1tl:ony ··a~n9. Th·, !')res(>nt
strnctllX'f' ,ta n "'OO(~ pl{:l.lll~ l;mr:'i'::.np. f:l11'Y;ortr!l1 0'1 n rock-f'i11~(' ~rt',. 7~}o 8')111-
'Wa;; is L.2'::; rt vrld(i, slopinG at 0.:1 Iln.:.;lC'! of 12° fro'1 th,... crest f!Jlt~lDtA(1 at
elevation 7P.).2 it tr:'1T,. ':-1ir.- cownatreu:\m iJoni">!1 is ,1 conc.n.vc c.mrvp tnn;.;Ant in
elpvat.ion to tIm 810"1"1 a~11 a Lorl:wntal 11nn at elevat,ion. 749.6 ft"~n. 'rho
overall If.l:\.;th of tl,;, snillway is 21 ... :; ft. 'I'll" nroi'n~ Oj~ tL'" prnSf"nt, struc
ture 11!l n1.own 11 ~;':i..f:. h.
'Jr • . i. F:. T,Ol,;:;:hlll.Tli', :'~n~::tnAf.!rln:: (!o'1m,1.ta:,t. for t.ril'! 'orU,prn !1tat~.
PownX' ~:o:11Pni'W, req'll(>atl~" that ,~ ::,~:1~r:ll st:t l1irv bae:1.n 8eaii;n known ns tho
:iAF* .tll1in~ '1sain, tleveloned hy t1)~ Soil Connnrvation ,~ir:rv1.cn, 1 , 2 be tested
to ascorta L.t ita ~18e.f':'lness for th1.s n%'O;JAct. ':i:'wo ~·1Od.,11!J of tbl" ';1\1' desi.gn
wnro constructed, tosted, and cOI!!parnd with tl,p actio!1 o.f th", f1'::d$t:tn,~ 8',.')111-
way atl.."cture.
1 "" I
An al'll1J.ysiB 01:' the p1'Ysioa.l fOl:"Ces 1:wolve\.' 11 th('! 4'10'\\1' cit water
over a sp.tllws.:1' shows tbnt i:rBvl t2: is thl!! nl"fll~o:nina.nt f'ore .. J tl,t,ro i!~ore U;e
model must be OPp.l~ate(: iu llOoor-danee with th~ i''roude 'rOtiol l.aw. ()P..ee t,t\.,
2
ratio of !10.:381 tei ;1l"otot:'r;e has ':"enIl fixecl, scale ratios l1.eCe8Rary for S11'!l1.
wity ore deterni:le::. Art(~r cO!1ail1erlltloll oj" th., 9'nd.lll':,1"" tnetl.'l" eqnirY'~nt,
a ~loal(l! ratio of 1t;;e.6 was &lort~d. n"irI..:; t1:'::1..e a~n.l(11 rntio, t'.o'·ollowiYlJ.;
ratios are obta:Llf'l<~;
r.(lflgth
ArOQ
,",plocitie.
11~n.6
lc3h3h 117.6, 1126,290 1t~!"I.6
ThorAi'ore, t;jt~ scction rnprl"lso::1tA6 6.9 per c~nt 0'" tlJ~ tota1 wy;t l of' the
main svlUmay (L25 ft) or a croat lOllr;tt of 29.3 ft.
'5'1),9 x tr~~. (~(l!9it;n .~~ /.~lElrbe 26,290
'''rotot~'Po nifJchar~e ... q ~_.. .... .. "*I'.P' i?
,0,000 ofa
flo,OOO cfa
100,000 ofe
0.131 nffll
0 .. 210 cfl!l
O.2r1:? efa
The tailWl'lter elevatlons aN! controller: hy thE'> lowr dB,.. of ~t.
Anthon;<r l'BllS. ':YA noo1 Alevatlmll!1 tn 'I:>I"! ~l'la.l!1ta1IlA:~ hy tl;n 10YrPr (~a.m, u
Given b;y U:e ~~t. Paul 'tat-riot Office of th(;, ~Ol')'\s of i\'};-ln('!('lra, p. :". 4.rm:r,
will bp asr0110~iS:
o - 6:;,000 ere
A. gAl" stillinc :jo'sin nasi;;n
The actual desiGn of the fi)\F stl1Ut1~: haaln 11'JOtJel was 'hased on " infor:no.tion contained in th(!1:iAi' stillinl: bllSL1 des:t.n marm .. 'll. The only qua...'1-
titlos reqn1red for tho des1.,:n 11rfl the dept}: and VA lecity of tLo trl~)l"Oachlng
stroam of water. l'}lf~ volocity can bB (Jet('rr:tinad, w1thin reasonahle lirl1ta, t,y
knowii'}.· tl:e dH'ferellce in 1!l1f?vnt1~:m 'hetwl'l~n th~ unner pool FlJ.1(: tb" r~nCtroxlmate
el{~vi!ltion of tl.o now ,'irt:'>ctl~t ~'bovr~ tb", stillinL; bastn. Her;loctin. the
veloci t~) of npproach, tLo upnor pool elovation can 1)9 approxi:"It1toc l;y
and
, upper pool ell.!vatlon .. orest elftvation + , do
d • (,;z; ) 1/) o b g
Q .. de8i.:~n diachD.r:;e in c.f'e
b • width of CMnnAl or cr("'st l~nr~t~i in.t't
[; .. aace If'rati':'l1 (ln~ to::;rn.v:;' ty :tn "'1 rt [)(Il" SM 'I
The elevation o.~' t;;,.., water ~m!'ro.e0 :in 'i:,}:p chute at t~;1') roint where it rmters
the sti11int~ basin can bo <1y)ro;-d,:'~J;l.ted ~):; trial b~' cons irle.r.i n: th(io tai lillater
elevation to ~)e tLr aC!"(llln~'lt ,1oi',th of tilf' Lydrllulic jli.1('. Then
h • upper pool elevation - taUnter elf)vation,
v ",~". 1 V'b n
and
~ (' . '1"1
wilt'H'a V1 • v(llodty of wat,er entArin:' tb~ st:llU"'l; basin and
water rmterin:,- the 9tillln.j~ 'basin.
f.'.ept:-: o.f
With 'these data, t.h~ dinonsiol1s of th,. sti..1J:tnr.~ basin for eitel', d", ...
sign flood can be taken d':rACtly from tria dosign f1lan'lal. ~'l;e di:'llC"'nsicns of
a SAV atl11:l.l1(!, blllJin for (;el!Jil~:n diochllrp!s of ;50,ocO, 80,000, aM 100,000 of's,
computerl ".:>y :netLoda of' thp cesir:;n Mnnua1 (Po 13), 111."" tn.h~llnted as 1'ollow~t
n •• lgn Discharge cr.
Item ,0,000 80,000 100,000
Critical depth - d c 7.S3 10.)0 11.9,
Upper pool olevation 796., ~oo.6 003
Tailwater elevation 750 7,1.7 7~6 .1
735 Water sllrface e1ovation entering hasin I 737 739 )
i
Head - h 61.5 63.6 6k
Velocity enterine hasin - vl 02.8 63.9 (>h"l
Dt~pt.1-t - dl 1.87 2.95 3.67
Froude nU1'!lber - F 1 65.S 42.1 )h.7
Theoretical tailwater depth - ~ 23 25 27
Act~l tail water depth - d'2 17.5 22 26
Height of enG sill 1,,22 1.5h 1.9
length of stilling basin - 1;, 22 27 32
Width and spacing ot blook. 1.B7 2.96 ).67
Slope of ohute (arbitrar,y) 30° ,300 )00
Elevation of "tilling baai."l floor 732.~ 732.5 7)2.5
The dAsiGn !lI8l1Ual rMommonda that the floor hlocks occupy an ANa
o.r from tio to 5:; per cent of the 1f1dth of the atl lUng hadn. The width a..'td
spacll,'l.g of tl::o blocks for this I!Jtur!:v: were arbitraril.v a,.11'il1cter! to 0('1'18.1 d1 an(~ resulted in an occupied width 0 .... 50 pel' oent of th", sti1linl~ basin w.!.(~th. /\ sectional vieW of this design .t'or thp :'lscr.a.rge of 100,000 ers is s!own in
Fir:;. 1.
71.0 ':lodnl tnsts i'mre ~~rfor'~!(l,1 at tl'", r'>r:"Iort''''f'llt.:ll ;'!1:;:i.flf'n:r1.'1l'
r.n~',01"1~tor:tf's of tLn ":ll.voroi t;, 1:' '.in~\t~sota. ~, '1,asfl...ll'ral1o(' cLnn.!1t"1 (, in.
wida anr'; 1.6 in. dee:''!, cC[.li'>;"'Ied wlt' ':'1O't, 1'lett!rb' 11."; tallWl'lter ("'ont,rol r~~
vices, was H,vat la:!;l\~ t"l1" tMtln.': wi tl:out an,y nltornt 1 Olll'! or flrlr::t:Vtonal oquin
"'!Ant. This nnlt :inch1 'n:: n ~;rov:2.o\l."I: ollli:.'rate(~ or:i,flCI"-r"tt'ltI"U' tor ;,2I"ltc~lnin.G
(IIil'lCbru~i:e ratns. A cAntrifHi;a.l rrt,!:'1:' suprlind watl"l' to f.l. f'onni;.ant l(l1Vl"ll tank
fro;"'! w~!ic! :l '1ntere.: :'low rm.s o'ht!:d.:1C,:~r~r the tp.st c!'l1'lnnnl. '!}P "01'01 'Wall
f'e.'br.1.catA.; o.!" f"IClto sheot rr!"oc!-;. TG:~hi;~t.nr "(l"lt1 1" 1:101"1'\ f";(mtro11.,('..r '~, an
a(lJ'laia~lr~ sl,llc(! .,ute atl(' tL;lr n11'vllt~O:-ls ,1q'Lolv;'11rll'''' 1;:,' C '')O~~1tt1'e to
tho llf'larost 0.01 ia., 0);" a..,.I;r'ox:L"latol;: to tliUlln 1/2 :b.mtot:l""P.
PrI~li:ninlll:V tr>sts of an (!!xist:L1 .. :l~1 sti 1. Un(~~ "'35i'1 r"'~l!!rt. ::,~\? ['or
ai>pro)Cl7JEltal~J ~O,OOO cra, all SLC'1Wl.l in ; 'i;'. 2, :lndic3teCl thAt !l :movn~"lln ')t'ld
consisHn,-: of' Gnir.1l. 111ast sal1(l. of. 0.02 in. t:lvp.r&;';e (~iameter (1"1['.. 3), wo'll~ br- eatis:actol';'- tor ::m1"ooses 0:' t.Lf'B" tnst.f.'. 'lmvover, w\:~n th" '1c;r1p.1 {)¥' tl:a
or1i.':1.na1 s:)illww\' s'1rface (lit,. L) was nlMAl~ in ot1Pl'ntlon, :it was cv:Vl'mt
8CO'U' ~la(.tnrno':" tLf> ori,::Ll~l rc;11hva~ ,.!.,.;a1 8n,: tLo.iA:' (lfll'Ji,:n ror 100,000 C'!fs.
: Lotora,")1",$ of' HU118 !), 6, 31'1\; 6A, as eO~':,('nrr~(' witl' '\:'1118 1:\" lL, am1 1:;, show
elonrl: t;;at oonair:ertlble bC,1 ':'Iov"¥nt OCC1Jrl'Ori l.nV;' orii.::;innl cLt"9ir:n 'Y,.h~rAns
no"ov~":10nt was ol:'~ervt"l(~ in ti'f! '~!\:: daai;;n.
l'he tl!stin.': iJrOcfK::trn "ws 1!I.8 l'()llows % '::.0 "ovo.';lr> 1m(~ r:p.low t,',o
,:":lo'~el wan 'bro'\lt to t.h~ r'lropt'!r olav:lt1 on ill &eco1"r~an.oe ",1 t,' 80Hru~1 n;"l's 00-
taino(l fror;; tl.P. 1.'11ll"VP.;V' 0'; tho rivl'!r' 'ec1 ''!l!!lde '1]:' th." (:orrl9 of i'n(~il'\(l'''rl'' in
1938. rn,(~ l'On:l,,/l ,,:isd,ari:o was tl,en set 1~:, ·t~ il" or~riee-nt~tl,"r Hl1(1 t.},!? t,ailwater
a.c1.justa,: '1l1t.i 1. 'l,j .:. 1."I:'!'lnir(>r1 t~i lwat,...,t' t" 1 Avontirm was O'":'t,f1t OA;1, T}i,.; t""st \'TA8
cc~ti!1~!e-~' ~!qti1 .Q ~1Ahlli!l.Qd Reour nattern La~) (!~e1oi:'e6 '-1elow the st.illing
hrusi.'1. In·'ost. instnnces ':'.1. ... le!l't' Of' 1"'111 waf; frol':', ~j:; '1'1:1 tn l }:o'Jr. :C1fI-
6
TllOVa1,la l)(I!d, ""mG lir:it~ri to n f~w '1irmtos 'I-)ACIl'lf:Ie inc 0' .l(lltl'! pnm'/y dis.i~'ation
'by thf' atr~lctuI'1'! wonl'.llltllVe CQu/Jee'; r"movnl 01' all the ~)t!t~ mttterial. r11oto
I;,.rraphie X'(i\lcorr.:s of each r'lm wer., "'lade 'ViO\rllV tLn stHII.11{' bas:trl thrO'tl{b Ii
Grid systom dividnd at 5-.rt int~rvals v('rtical1J' MC) lC-ft "U'tallOOS hor1-
zontal1"v.
Serios 1
The f.1rst aariell, exploratory 1£1 nat,1u-e, -was ''lS.(le on n:1 AJristing
SAl' stilliht; basb "!'1Odel (rig. 2). Alt}lo1.1i) I'!Ol18truetl'l(~ for anothor 011t'OOS8,
this 'l1orlol wna ,Jbf'msion(llc! for II. not'r of 50,000 cra J 1'I'~cept thnt t'hn lt1mgth
of bal!in was 17 ft in8tea(~ of 22 ft as s;"loolfiAf1 :1.n th!" 'U\' df'lsJ."n 1namtal.
Thro(l! tl'lSt runs wprp. '18 4" on tris-:od,.l witl": silica 'hla13t a!1n.d ~'ser~ a..q a hed
'l'l4terlnl.·hoto~"rnDhic rE'lCoX"Js of t:IO seout' pattern for each rnn arp. shown
in Fii~. 6.
Run :1). l..-lith a ('iecr..~l.l'6~ of :50,00:\ cfs, 'tl!n ~ti11ing 'basin
ap-pcDrs to have f:l:i .. rl:T ~~co~' e;ll'!r[~l ,'1.saination. Tbe BCO·''''.!' hol(, ,~:tc1
not ;(} helo'l;, olcvatio~'1 730.rt ~;)r..
t~un ',Jo. 2 f "ischar~;e throW;:h s tr.lct'Jrf~ WIlS no,ooo efs. 'l'l'·ls
run shown that the> a'1ron is too si:ort ~l.l1(~ that t1;~ jn:'1n tn:,ea
place off tl:(' enl~. of t'h.e apron. :1(!ptl' of' sconI' an;')fI:!IiU'B to he
about 10 ft 'bl~low apron laval.
Ru.'1. :10. Jt T1-::t8 d:i.sc!;~\!·ge is 100, 000 ~.r13 or 100 ~:r' eont
OVN' th~ dasi,!)l flow. The ll:\!l(~th of th~ SCOur ~v)lo lIas incr~no.d
and baa seouret,) to tllP 1)ott.o'"': of trlR cLndne1. The jllr'f; is ,.....11. orf
the end of ti,e stilUJ'li~ basin, ant) -t.L" wat,pr 8',rf','1ce 18 ver;y rO~lgh.
This flow is '::efbitel~\' 1m:/om' the c:a)aclty of tId.s et'-lli\')~ ~,~t!!in"
Series II
Tl:!'! s(')cond 88ri(l)IJI wa..e :nade on t'p Ol."·L ina 1 npU l'W!lY ""10(101 v:1thQea
rool< (nvera.:A cj1a:'1fltl"lI' 1./2 b.) for ")~c1 :":l\t.,"r~,8l. Tho elia.lln~l 'Io.elow tl.~ Apron
was placed at elevations giv~n l,=T str"a;-:: be<-J soundings, '1ut tLr> fot'C!" at the
jet :rtickl:, !'or.iJ{1 tl(' sCO'~:r' 1·01 .. , n~ f.!L·~! ~~, "L!.C- ,»to;'r"nL~ .~,.f' ~mtl j, 6,
7
the scour hole occurred" InrJiv:h:11al p;ravel ~ticlpR werl"! ah1rter~ within the
liJnita of tL~ hole, but tho plltt~rn of tho 1,0(1 reru:d.l1od 'mn~'Ol".;:Afi. ?hoto
graphs of tho scour pllttr.l"n tor this BArios are shown in· F:L: .• 1.
}iUll no. 51 Tlil!lchar;;;l':' ~O,000 ere. 1"ro8ion or bed to eleva.;..
tlon 725 ft '!.1T.. ~~tl"ew.ll unable to '1'IOva rna,tarial ramovflo from scour
hole fl!},~ d0}'>0a1ted at ';ta. 1 ... 60. Ti~!.lO of rnn 1 h011r.
Ibn Uo. 6, nbehargo 80,000 ots, '>cour hol~ lflnp;thened with
considcx'able 'l':ov-r'ment oS:' mater-iii! wi thin sma of' scmlr. Ti"'1e of
run 1 hour.
Hun :0. 6.Af ;iiacharce 100,000 ofs. T,ooeth 01" seoul' bole
furtLer i!lcl"masec.. pr:a.torio.l shifted alan;; botto'": of aeouren a!'(!\Il.
110 :;IO\lOY:\(lln~ of bed aftor 1)0 rt b!'llow otl(~ of apron. '.1'1::'1e of' run
1 l-,otlI'.
Ser.ies III
Thla aeries was :)').lldf>. with a.':1Odnl of tl'l' original spillway fro~ the
crest to the (;n.d o.t' the 8.T'l'on ('"ci;;;_ h). The her; "1.'lter:i,al selecte(~ :'01" this
sories, as for S;;:ries 1, was silioa 'blast eEu11:. The nhoto';ra:~hs of h'uns 7,
0, anc'! :; ahoy t~;;lt this 17!Eltor1.al was too C'lro:;1.vp. ror lmre wltL this Y'1o("Jp-1.
hun ;'10. 7l 0isl1l".8l'ge :;0, 000 of's. J at somll"S ,Jeep hole in
bed. TiMe of' run 12 minutes.
Run :lo .. e l Flow of 00,000 of's enlargAIII flCOllf' l101f'l and extends
effect of jet farth~r. dowl'letrea.'7l. TirlW! of run 10 minutes.
Run ;lo. 9* Thill is f'or l'l1Q'dnrmu d~s~.~·m f'low of 100,000 ef's.
The jump belm., tho anron i8 very unatahlo an':~ calls .... (~ thf' seonr
seen in the photograph in a rnn of'1 'nin duration.
A ~.a.r stl1Un!7 hasb (~~n1.; .. nec t~r)r n :::Q:ci"'lu1' discharge of' 100,000
efa '!J'I,lA t~stA~: in thin sarten of ru.ns. flown of' 50,000 cf's and nO,OOOcfs
W01"9 c.lao uoa,l to rletern:ino Ul(;~ offort 0:' t.ho onerntion oi' the ntilling basin
et 'U!Ift}u:;rr:-::as. las. tba."l ttco (:051;;:0 now. 'l'Le bA,i "Iaterial used wan pen rock,
tho aa.:'lPTIlltoriH 1. use..:' in :.leric!$ II.
Run ~fo. 13' '")iachar,09 100,000 ors. No movAmtmt of th~ h~d,
and co:r~:lSl"ativf'll..y s !"lOot} I water surrs.ce dir~ctl;f below stilling basin.
'Illia 18 tl':p desit:n flow.
HunJo. 111 DischarGe no,(X)Q ofl!l. 1;0 :'i'1OVfrtllP.nt of the 1:Ierl.
J'!l'nP insidn l:L-d:ts OJ''' nti llin;; hasin.
Sories V
TLe test conc;itloM for thIs series of runs '-,>eN identical with
those of ,aries r; Axce,t tbat silica blut sanO. was used in thotJl" runs to
provide n l:l(~,.: :1J.ltorial ",hiel: WO"Jl,) raa<~i1y shaw any tendency, h<J\IMvor slight,
towar(~S Broai~m :olow the en·.::: sill.
Hun ~jo. 16t Diseharcn 50,000 c.£'s. The .1u.'n~'; Ilrf;,oars to h~
tully conta:tned on tLItJ st.i111n;: hQSitl. 'll:e seO'1r holH (;OO~ ~lnt go
bolnw eleva.tion 726 ft~"St.
Hun :10, 171 ;'lscliOl'(;o <)0,000 ef's. ThA SC01U" hole is Bli~;htly
deeper and lon;;er than for iNn '10. 16, but tl"m action of the sti11-
i!l£; has in is vory Good.
jtun :~o. 18. Discharge 100,000 efe. Tnt> seo'U' half' for U:~,.
run is aon6what 10l1t;er tha.'l for :"1118 16 aM 17 hU.t is not notiee
ab:l\v deoper. The jumP apr~ears to 00 c'ontained on the stilling
basin. floor.
A co:~ arison 02 t!.e ~1"ot:"),\:rn~:'hic l'ncords o'!' ~erie9 n Mr:' nr and
:1Aries :i:rr am) v 01001"1;' roV'Pt.11s i;,.n effoC'tivrmAso o~ tb~ '·,ltl' (~tud.r'n as com
,arc,! vrl.tl. ttl' orL:inol !';:>lllwn:- n:~:r·on."ot onl;: is thr'! oroa:'l.w- force of the
jet tll';o~t:. co.:;::;;'etnly o11'11.natf)(:' .. 'jut tio e-:.:tnnt of' th~ action or t::(\ l,y,.lrau
lie j\L":'fl in r(\,:nc~,: no tl Hl t l.L,., ntnr $ur rl\C0 he l~,w th~ at:!. 111'1(: bMin is
quite caLl. "fLo ;;~ri(m '; tests 1.'!1!0\'\' t.1int oven Wl(~r1 t1i1" hf"l(";atnrial used i8
q!lite fine, tIe stl nln~ 'I.;UL1 is ati n of:tf.'c·tlv~ isl con'::'rol1L'lt t2:ro~d.on.
The 10Wl"!l' '~a:'!, 91 t:111tod a g' .Clrt:' tsta."lce ,1o"netreo.":" rr'''''' tb:- "t. A:1t;)nny
sr>Hlwa;v, ~:n ~r.,~t't~!~ ct)~tM1 :)" tb:, t;)ill'3tt"l" (1tl!''t'at'1.'''·'S, 'lfAetnr whieh,
9
together with the probable .foundation conditions, is favorable to thA '~F
type of stilling buin. Another factor in ita favor i9 the relatively short
Ungth of the .tilling basin.
In t.hese expeI'i"OOntr. tl:~ efft';)ot o.r floatinG debris, auoh an ie~1 on
the operation or the I!Itl"l.lct'U'al stt.tb:1.Ut:v· ()f tbl"! stl11inr. basLI1 '\'Ittn not con
sidered. P\'lrtLer Iltnd:! 'W<'-lUl.! bo roq'11.r!~d to eval'late thfl inportancp. O:l t1'1_
aspect.
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.BLOtK AND .sILL _D(.A:r~DN ""'00 EL £:LALE I: ~'2 ,b
SAINT ANTHONY FALLS HYDRAULIC LABORATORY UNIVERSITY OF MINNESOTA
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bLOLK. AND sILL LDLr:·~ .. : iDN r"'\ooEL 5CALE. \ ~ 5l!.ab
SAINT ANTHONY FALLS HYDRAULIC LABORATORY UNIVERSITY OF MINNESOTA
~~AWN ;~SI1A r~~E~~~~ ;;-- rA~PI~~;~D " -'--.~ .. - 'j'---_. __ .---.--_.--SCAI..E 'U;::.LC-DIt, DATE 7-22..-.~: DRAW. NO,
Tested b~
Date of Tes,t
Me t l10d of Test : ______ _
SAINT ANTHONY F:,LLS HYDRAULIC LABORATORY UN I V E R SIT Y 0 F MIN N E SOT A
SEDIMENT SIZE CiSTRIBUTION
U S. Stc"dard S:eve Numbers zoe f00
:;25 230 170 120 so 60 45 35 25 18 10 5
Se r ,,]1 No .. ___________ _
Source
Remarks
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Sedlrnerlt Size 'rl Millimeters
lily, SI!t I Sarld --1_ ':"c,ei .,---··---------·------·· .. -··-·-r-·- . --.-------\--.--.--.- _ .. - .---. -------... --.-~
COI';~ .. Very F nf l~._._l_ ~_o~ Coarse! ve;y-~0~1_~~~~~~--L._ COQ::"; L~!:!_ C-o~!sel- ye!J~~~ L-F~ ~-;~~! M-ed~um i --c~ars;~v;..-y·-C~or5e ~ Amencon Geophysical Un,on Classificction
Bed.. .5eclirnent. us.ecL 1 n EXJ)eri rnents I
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13
ST. AWTHo~r.., ~ALLS .sPILLWA'Y
ORIG-.INAL .sPILL~A"I 5URFALE MODEL ::£'All: I :'S&.b
SAINT ANTHONY FALLS HYDRAULIC LABORATORY UNIVERSITY OF MINNESOTA
:-~~f~\~Y:~~ 'I ~:!:~~~;_ sa I ::~~::.' --- -
14 ST. ANTHONY FALLS SPILLWAY STUDIES - SERIES r
SAF Design for ,0,000 crs Stilling Basin Elev. - 732., it MSL
Run No.1: Discharge - ,0,000 ora Tai1water E1ev. - 7,0 ft MSL
Run No.2: Disoharge - 80,000 cfs Tai1water E1ev. - 7,1.7 ft MSL
Run No.3: Discharge - 100,000 ers Tailwater E1ev. - 7,6 rt MSt
Model Scale - 1:,8.6 Bed Material - Silica Blast Sand
Duration - 45 min. Photo 2930· ..
Duration - 40 min •. Photo 2931.
Duration - 30 min. Photo 2932 ..
Fig. , - Erosion Pattern - Series I
15 ST. ANTHONY FALLS SPIUWAY STUDIES - SERIES II
Original Spillway Profile Spillway Apron Elev. - 749.6 rt MSL
Run No.5: Discharge - 50,000 cfs Tailwater Elev. - 750 rt MSL
Run No.6: Discharge - 80,000 crs Tai1water E1ev. - 751.7 rt MSL
Run No. 6A: Discharge - 100,000 cfa Tai1water Elev. - 756 ft MSL
Model Scale - 1:58.6 Bed Material - Pea Rock
Duration - 1 hour Photo 2936 ,
Duration - 1 hour Photo 2937 "_
Duration - 1 hour Photo 2947
Fig. 6 - Erosion Pattern - Series II
16 ST. ANTHONY FALLS SPILLWAY STUDIES - SERIES III
Original Spillway Profile Model Scale - 1:>8.6 Spillway Apron Elev. - 749.6 ft MSt Bed Material - Silica Blast San
Run No. 7's Discharge - >0,000 efs Tailwater Elev. - 7>0 ft MSL
--, "---,,", ,-- - ;-~~ - . ·r.·~ .,..-~
1.-_ •• Ift 'ft - v fV" ... -", I~A
-~
-r-- -- ""-"':' --::;: :- -1--- .,,;.:: - I",'
.- "'c· r--
-11-
Run No.8: Discharge - 80,000 cfs Tailwater Elev. - 751.7 ft MSt
Run No.9: Discharge - 100,000 efs Tailwater Elev. - 756 ft MSt
Duration - 12 min. Photo 2938 ~
.. , pu ~ ru-
1-~-
.~ F J1'-" .
iiC"
DUration - 10 min. Photo 2939_
Duration - 3 min. Photo 2940
Fig. 7 - Erosion Pattern - Series III
"fU
---~
;
.. J;iI
17 ST. ANTHONY FALLS SPILLWAY STUD!ES ... SERms IV
SAF Design tor 100,000 cts Stilling Basin Elev. - 132., tt MSL
Run No. 15: Discharge - 50,000 cts Tail-water Elev. - 150 It MSt
Run No. 14: Disoh~rge - 80,000 ots Tai1water Elev. - 151.7 rt MSL
Model Scale - 1:58.6 Bed Material - Pea Rock
Duration - 1 hour Photo 2946 t.--
Duration - 1 hour Photo 2945 4._
'<>~. ,,~ .• ---- --" --........... -~.q-..... ------. --------... '" •• ... ..
Run No. 13: Discharge - 100,000 crs Tailwater Elev. - 756 rt MSL
III ... , ....
Duration - 1 hour Photo 2944
Fig. 8 - Erosion Pattern - Series IV
l8
8T. ANTHONY FAIJL8 SPILLWAY STUDIES - SERIES V
SAF Design for 100,000 cfs Stilling Basin Elev. - 732.5 ft MSL
Run No. 16: Discharge - 50,000 cfs Tailwater Elev. - 750 ft MSL
Run No. 17: Discnarge - 80,000 cfls Tailwater E1ev. - 751.7 ft MSL
Run No. 18: Dischar~e - 100,000 crs Tailwater E1ev. - 756 ft MSL
Model Scale - 1158.6 Bed Material - Silica Blast Sand
Duration - 45 min. Photo 2941 ,.
Duration - 45 min. Photo 2942 '-"
Duration - 45 min. Photo 2943
Fig. 9 - Erosion Pattern - Series V
