|
<br />
<br />. 1 . ,,~,\
<br />
<br />Q=il~.-
<br />
<br />>
<br />in, which ,
<br />
<br />. ..
<br />, , . ...., '.,','.
<br />t9tal~dischargEl in ,c.d.8.
<br />area of flow .
<br />~ = ilecelerilticll of grilvity
<br />.T _. suri:.lice widthoi: flow
<br />
<br />~ ,;,.~+
<br />
<br />,..;'<;'.;
<br />
<br />Q.~
<br />a. =
<br />
<br />, ".' ,'~ '. '
<br />
<br />,,,,I
<br />
<br />At high stages the hydraulie control would shift to the outlet headwall.
<br />FI'ie:tion losses.,.:j.n"tl;1econdu:i.tw13re,esti\llaMd by Darpy' s formula., using
<br />a coefficien;t of~Q}lgpne.ss. "f",,!,Q1W,;LtqO..02l... ;:stiJ!lat,,~~..or losses in
<br />terms of velocity head in the eonduit are:
<br />
<br />0..0.25
<br />.0..50.0, .
<br />4.085
<br />
<br />Trash raek
<br />..J::ntrance ...,' .
<br />. .Cond:~i i:ricth'n.
<br />',,' ',' ,;"
<br />, ' " . .
<br />111e total headwo;,ld be$,~61Ci t:Lmei3'the eond~t velocityh~aQ./ The
<br />curves resulting'l':'om the'COmputilti;on oi: diseharge for the"different loca-
<br />tions .of the hydraulic control were. me.rgecj il1to one c)Jrve to obtain the
<br />complete diseharge curve i:or the eondi.rl::t. . Tr;econdult rating curve is
<br />. ,s.hown .pn..plat", ? of the. .projee.t report., >.The mean velocity through the
<br />.conduit,:Corthe maiimum di~cl1arge S{lOTeubicfeet per fieco!ld .is about
<br />29 feet,per,second. T\le de~:i,gn, s},(:jpe, o'I' the. cOl1duit woulcl. result in
<br />supercri tical. now ilt an .plltt-i:ul:J; stilges.... .
<br />
<br />3-03 .outleiv,1JrksstillingBilsin, -ThestilJ+ng bafiin was de-
<br />signed to prevent hilrmful erosion by dissipating excess energy oi: i:low by
<br />meilns of a hydraulic jump. The pr:ilncipal feilt,1.1X'es are the nared sloping
<br />apron,. stilling pool, end sill and 'cut-oi'r.,'!iaUs,' for which design
<br />,prin<;iplespave. been..establiiihed by l1),ode.lstJ1dies. The sloping apron
<br />follows the form of the patabola.: .... ,
<br />~.. '~
<br />
<br />. x2 '" 3.5'vg .Y
<br />
<br />g
<br />
<br />A. constal1tqf,.3..5 w~s used..il1s}.e~d .of Jhe~p.~oret,ical.2;.'brCiJ.(tfie the higher
<br />. valu,!" yields a p,r;ofile, mor.a .co.ndJ1civa to sPreading of.th.e jet. . The depth
<br />and wid:thofthf! basin as sl10wn on. plate 4oftheprQj~.c,t report would
<br />insure!-:oI)m/1.t:i,ono,i,' the jump a;ndwou~dapproacl1 optimUmprbp,ot"tions for
<br />e eonornical eon,~trl),etio~ .Th~ bas,i11 floor would be~et.,q .91)2 ,below mini-
<br />mum tl3.ilwater and tile ."liop .0f1;l1e waUswould be.se.t .totlfe;evel1 foot
<br />above max:Ln)"Um t,ailwatereleilatioii~ i' 'A .lO.,.foQt bo.t.toIDwidthpilot channel
<br />dowD(ltreamfrorrl the.ba~in allows a ireduqtioni\!. wa,ll height. Although
<br />onl"'1 a m:ip:imi,lIri,a~i)tri).1;o(taiJ:vi:a':teI'i*owerin(!; :i,sexpected/.aiiiin:j.mum tail-
<br />. water 2 feet: beloW that 'ofexi,stirtg > condi tioris. .V\'as. used to Eietthe bilsin
<br />poor elevat:i.ori~ . .lVloreover;'the eniftsill is jlroportiqnedio ereilte il jump
<br />even if the tailwater fallsbelqw.the estimated leve},.
<br />, ., ,; .,.' ,'..
<br />
<br />-4-
<br />
<br />Appendix II
<br />
<br />.: .',
<br />
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