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<br />o •c roc ..o +:c nc me ow .- ... .:a
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<br />L~-.e :I in~naerpo•m: ron.err~on ra~~o LoP+ L~o~r Poir~ m•r1oU ,o Lnow o•eo mlrlod for a•eo ~e•i o: i:: •+r~~tl •cr
<br />7.7-G-n. ,'OZ.
<br />`::lit:rr •.euu'.d no: result in loss of Ii`c ~;r ezten-
<br />~:lc property damn;;e. In wch Instances, the
<br />hli•;I cu;: of spill~ca)• construction mad not
<br />t•.;.rr:utt use of p:robablc m:aim:Im orccipi:a-
<br />ti,~n I:t drlcrmin:rtlon of the in!'.a:^ dcsi•~ P~ood.
<br />('F.:vt< ha•re been prepared indicatir.~ rcduc-
<br />uon ;:,eturs to be ap;dtcd to th,• probable masi-
<br />n'~u:~t ~":I!ucs for u•t:•rnlin::ion of a drsi~n
<br />.. •:":n fcr u~c in a lov: hazard area. Rcductiot:
<br />factors for probab!c r.:nsim•Jm e;tlucs in r,~ures
<br />]v, 1 ~.::nd ?n arc ~;!c•_n in f:;;ures °^_• °_', and
<br />•~-i, 1'C.°pCCU I'C!)', \ 11UCc f:'0^'. ~I~t1rC ~~ J}lOLlld
<br />l.r :.Iq>llcd to the G-hour pru6ablr masin:u^.i
<br />{+:rclp:;:aion ralucs from i:gure IS ~cishout uxe
<br />ui ba~~n shape reducto^ t•crcen:^~c; 3•n"cn in
<br />~ul'scctlon :i0 (c?) (1). For time distribution
<br />:,nd :Irca ruductlo^., we the procedure de-
<br />r.crlLG•I nt >ulr:~•ctiul; ;,0(di. P,eductions pro-
<br />linrc cslur~ tchich hn~~c about a 1-pcrecnt
<br />cl:an~~r uI Lrul;t ~~~lu:acd or c~cccll~~,l in nny
<br />ynru rl~:u'.
<br />51. Fihnatinq Funott lrom Ro~nlall.--1:1) Cin-
<br />r r,rf.-The h:: ,!ru~nctlorulu;•IC:a a;l;lru.:c!. to
<br />an,l.'zin;~ t!nod c•rcvlts and predictir.~ thc• mag-
<br />mtade of good; requires a turn i<a ^.t::;o c` tiu•
<br />di!?crencc bciv:ccn Prcn~v:atum and .. :anrC
<br />nmo;C. Front a ;lou:! dc•trrmlr.ation •, uI
<br />cicv:, :hi> di crencc is c'on..idcrrd lu.=~, .. ''+~;•
<br />irunl the , rvci;tit:~tion in!!ing utlr :- -:.,n lc:r-
<br />tcrshcd. .y ..Implc <oh•t:on to ,ilrnc :ai> !v-:
<br />t;tluc a{~pcar.. to Lc ir. cndin_ thr r:~tc ... •.:~ir,ch
<br />~•:atcr v: ill intihratc 11110 ;!1P :n:l. I[ ...^.IS in-
<br />filt:'atiu:: r;r,c tc ;;t:ott'n, alon„ ~•.Ith tl~l~ :...,gun:
<br />of p:'ccipan:iun, a :i;^.;,Ir ,uLu•ae:i~~:: >huu!d
<br />~tce the amount of ntno;f IIo«i'~rr, thcrr
<br />arc u;hcr {vccip it.^.tiol: io:<cs Ut ~,i•i~::un ;a
<br />in!lltratlor. :Welt :u in;creent:o:: i•:: .':,cutacC
<br />con r, ~ur[ace ;tur;crc, ar.d arapor.:::o;: :):a:
<br />may hate n:.I,crial cScc•t ou r'J nrr~ .. ^;l'iln if.
<br />\'arirn:.ti t;.,^cs of ;:ppar;,uts .,..•:c bee.^. de-
<br />ri.ctl to tc~t the n::i!:r::Uur. ratl> ui .c.i'.• :c~,l
<br />stullic, h:nc been m::t!e u.` i:~i;crcc;•:Inn :u:u
<br />cralrvrat!on 1u<st<. .\ahuu;~'n nt:I~,: ;o an c~-
<br />trcru'"Ic !:u•!•r ~c:11G• r~~u1d Il:din•• m".l n( the .ur-
<br />f:u'c st<u'attc :u c;t, it is :aq~:u,•nt t!::•t ;~:• ar, ura h•
<br />cullnncu•Ir ccaltta:ion -.,;' all ille !~, f;u t~•r;
<br />can Lc n:adc only fors hi;;hlp ul>;rumcntr,I.
<br />small {rlot ui gruuu~ ar.d that such an
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