|
<br />.... ", .:.j~
<br />", 0\
<br />..;~/~
<br />..,......... ,:1,..:..'; ,.q.....)dl;...!.;.~.~.: ..r,.q'~l.''''':.::f''~;;!,r',',':;'i.;''"" :,:,..
<br />':\} '.,..4s, no, gliging~~~o~ }V~re!m~intainedon thel streamS ,~thin the
<br />';',''';$-' ~as .of intense. ra~nfall, it ,wasin~~ary to, determine the maximum
<br />'<:<;'~ d~hargeby the slope method afteJ:. the Hood had passed. ::The work'
<br />~:::: was ~one.with,a,plane;-.table. equippe~ wit)1 &. Johnson. quick-leveling
<br />",::,> head, ~ l'!lco~...i~nce;,alida,de .having"a '3-inch ,striding1evel,' 0.'
<br />" ;', ~4-foo~ s~di", rpg ~dqated,~:half-tenths, and a IOO-foot steel tape,
<br />:;}':~:~ -!ill, ~istan~ ;}Ver~,J,l1~}Vith th,tj taPe:nn!i checked by stadia.,..;
<br />. ,..,Eac~..tributa.ryI,st~,:wasqnea!l~J;"ed,:!\,S, near. the ,mouth as the
<br />!::::t:~~~"..,~,'~;..':'",:,.~,!,., condition,pf t~~ 9ha~e~:p~pn~tted.,!.;A c;o.J.;efl11 inspection WI\S made
<br />,'- W)ocate,a'/l6gmen~, C?f,channel .which'Jv.~,reasonably straight and
<br />t:~~~,;: f~e, 4"0~ 'prush, or, other o~uction i and., in: which the :discho.rge
<br />
<br />I:tt:~ ~~d~:;:~::tt~~~~~e:::~~~::t~~~:~;::::::i\
<br />
<br />1:47:1; at. the ,upper.: ,enp."lpidd).e, and. :~o:wer end,l :P}ate'IVrAj shows a typi.,
<br />,t(~:ii . eal segm,e~t. :..A:,t: ~!Leh; of I Aie ~hree, sections i stakesi\vere: set. at, the
<br />. .... high-.water ,line,9n.eacP., sid~l pf. the"c,hannei, .neginning, :at the ,up..;
<br />f~:: s~rea,m eI).cla)\lv;eJ)iIle"wlL.!! rl1Il ~.1lA4th~,~stakes; clolling, on the.
<br />>t,., initial point, 'v:~th.lUl' a.1lo~!Lble ,!!rr.oJ; ,Of., O.Q5:foot, .,'rbe, distance on
<br />:~".:;.".-,:,',:~,1,{~::,:~.',~".',,:. each side. between,sta~s f~aS'DllllLSJl~d!~lq:tl.g"thei ;higb,"water line.
<br />_ ;. The crosS,sec,tion;bet.-ween e~c;h.paiJ; pf st!lkes .oIl: opposite:sides of the,
<br />}~i,}t:.~ c~ann:el; I w.~,;carefu~ly( measured. 1 "The, generaI. l?cation; ,of . each,
<br />,t~,\; m~nsuringpoin,t,~~dete!-:lIli,:p.ed, by,refereI?-ce ,to section c()~ers,.' Ow"
<br />,:,.,,',~.'.,'~..'-,:;,.,~.',.~..:,~.:.;..._:,: ~ ~l?' the eifl!Ct ,~f,~~~ ,in I' 'i~e,.'chanb ne}, , that ,could,; not beei1ti~y
<br />'" avoided, tb,e, differ~nCfl;l -miee~atl(m ,etw.een-,adjacentc~ss ,sectIOns
<br />',~Z:;;~~ ~asnot the..sl!--lDeon,.both,~d.eIl;of ~Qe,!!trl!llDl,.nor,was:the distanCE! as
<br />,',~, ,'" D1easur,edalong the .b,ig.h~;W,a~\lr.)inl;li.tl).e,!lamei Qn i both'. sides. ! Both,'
<br />:>:,:, ' diStan:ces \illd di~llr,ences,in,el\l.vatiop;~vere &v~ged to ,determine the'
<br /><'/:-' mean;sippe :betw.een; !ldjace~t,.se~iion!J. "d: 'I" '1'':' (';'",:;',:;", ': :
<br />:t';:{i . Each Cross seCtion ~as plottl!d Qnl!o)aFge,~cale.,and,the: area was
<br />'<'("'~5 dete~lned by planimeter. By, means of tables based on, Kutter's
<br />:';:.',~.\" formuls; for:How:,i~ ,OP~I1 ch~~_s..~he",discharge . between; ,the, upper
<br />,}:~? and middle cross sections I\nd that between the middle and lower sec-
<br />';~~~: tions were determined, the areas of the two cross sections being aver-
<br />". "~L}~~~
<br />~ ......... -
<br />~::i~;.:r;:
<br />
<br />, .
<br />
<br />.
<br />
<br />! ""'1
<br />..""-:.;,
<br />~:]:~.~:o
<br />~}~.M
<br />;~~~::~j
<br />~,.;~:,
<br />t~:~:.' .,
<br />
<br />
<br />
<br />
<br />
<br />
<br />l:""~'"''''
<br />i::.F5~
<br />
<br />.
<br />
<br />.
<br />
<br />r...' .
<br />..'. .1.
<br />
<br />i: :'~Z.')I. ';~OD..ll~tl\y~~~.~/.j.;:f:i!, 'ifi';
<br />
<br />'19
<br />
<br />6; feet, 4; in~es ,1;1igh ~onstrqcted ,in. a .trench: in.:. the, natural ground
<br />~ntir!lIYljbeloW ,tlJ.e ,artifiqial embankment., : !This. tunnel is'provided
<br />with, t"9, 3(hin~h pipe mle~ equipped,.with: gate valv~,,: :A spillway-
<br />~or"the: reseryOll;,}V~ provlded,over;a rock,cliff, som~, distance from
<br />~e dam.,tt ;:~~""~i"~ d~';", j~\ 'J:'" ,: ",;:' 'n!l :1, ...;.~:t::l:'rq':;:h!l' -:! :~,r;
<br />~,,').'his .reservoir successfully, w:ithstood, tl1~, H,ood; stOring all the~~
<br />off. abovl;l it until.thehigh ,wn~r had. passed.:;;, '.1;',,.,, j !; ,;.. . ,,' ,'.
<br />
<br />I.... ":' ';'.~: ','(':;;:14; ?l~~ ,: ,..'....l:Pit~ i.-';~I';!~~ I, '.;'r::!l." 'j'."
<br />, .., FLOOD FLOWS" .'
<br />'>;,\!."~~:": it';~'!'~i'': :.:.:::; p' I:',,!';:;;" ,'1.',:1: ,. "C.: r,,~.t. ':!""
<br />
<br />METHOD OF DETERMINATION. :",,'
<br />
<br />, '.
<br />
<br />'I, ..
<br />
<br />.' :',1
<br />
|