|
<br />76 DESIGN Of Sr.tr,;l C:.
<br />$zewpl[ 1.-1lezimum Pro beblr f•food Eosf of fhr 705• 1(rrirlieu-Conlir.ucd.
<br />- _(rrnrf6l Drorrdur[ -I Snecinc aDD ica4..n -- - _ _-- -
<br />u
<br />5. Este.. ~.J:e dlrre: runoff. I 5. lal Ileslpn nlniall, masin:um prub:, Llr 7!ond I?:i
<br />c
<br />r
<br />tin
<br />l h
<br />t
<br />d
<br />f
<br />ll
<br />l
<br />f _-___
<br />;~n rain
<br />ea
<br />g i
<br />urs
<br />a
<br />compu
<br />(a
<br />r
<br />ermu:r
<br />;
<br />a ._
<br />Iilr r.nv••tum proha6lr Hood (?:PF1 br nppl~in~ ~ .+~~„r„•,'. ,,,.. In. .. ,
<br />~
<br />~
<br />f ~
<br />
<br />:hr aJriil un:al nrr^ rrJ union (anors. „ICrn m r, rnd,up Aonr .+rr,:r,,,'~i„c
<br />,,,,, I I•~r•. ,,, ,..
<br />r ~i. ., m ,,. .L.•,
<br />,
<br />,
<br />4rv ...... ~ slrl ,,.
<br />aect n,n :AIJ1111 and shown b; lose, to the ao I - --"
<br />"" ---
<br />,_" -'"
<br />cu:nulat:vc I`\I I' drsl4n ar:ancemrnt from 3(cl, t .. .. I r : I 1
<br />L
<br />
<br />
<br />abase. I:ounJ dra:Cn rainfall calurs to lcr.:hs II
<br />I
<br />
<br />:
<br />
<br />~. .. i':
<br />1
<br />~ I
<br />i
<br /> I
<br />~
<br />Area reduction factor from see. 50 (dl (1! : ~ + n. .l
<br />I L,.., rI•,
<br />j I,.- _
<br />
<br /> . .. ....
<br />ReEun,on I ".1 .
<br />~l
<br />.. . .~.
<br />r)rauaar area. .,pur• uu,r•' ~ farrnr, r ~ I4G _ rJ ~ ab I ]il9
<br />~ ~~~.~ .. '. r
<br />Fcrcrn~ I
<br />I,,,., .-- 10 ~ nn
<br />~~~~ 1,1 ~
<br />~~
<br />~
<br />i ••0
<br />,.,. .....
<br />...
<br />.
<br />t1 ~ dr
<br />
<br />,
<br />15
<br />0.'i
<br />In ..... .... :U ~1
<br />~ liner pola:• Imcvrb for msrrrt Enmarr a.ra.
<br />
<br />(b~ Compu:r J:rrrt runoC, usin_ ruac~ n:nr for
<br />hyd rulr;rir suil~corrr rnmpir~ number for ron-
<br />ciriort A)1 C-I! Tarr appcn:i:c n) and devgn
<br />storm rainf a:l :a Lu!:urJ in step lal. ahovr..4r.te-
<br />crJrn; tnurs:ure conJ:uon II (A:•IC~IL a used
<br />for m::>;in:e:n proLau',r }loud computation rxst o.r
<br />lOJ' nirnJ~an. ConJlt ion A:d C-11 assum,rs loll
<br />m„IS[u rc su pp!S ss-thin t'ne sratcrshrJ w bo vm-
<br />ilar to arcragc ror.diuons present before occurv
<br />rrnrr of the ma~ln:um annual flood. P.unaf7
<br />cun~es, (.g. T-: lappendi~ .4}, do no: eon:aln
<br />the uimcnvon time.
<br />
<br />
<br />r
<br />)
<br />3
<br />. ;
<br />• •
<br />~~
<br />1L4. d=~s.a
<br />Ibl Compu talon of d:rrc: r~nn:r
<br />(11 Scr table bc;osc. Arrc n:~:!ati: ~~ rcn"•'.
<br /> rnmpu:c<'. he c,;u ar,,,n h~;. r.• .~ r:,;~hr.,
<br /> ,l}.
<br />(~I c,~r tab;,. 1.r I••~r.
<br />(3) }fin:mun: ra r:;: n•n rate r.,c~r Lrr P;,
<br /> loerc Froup f'. •'.;;,-U.30 ir;'r. • • r hour,
<br /> tior. 5] Ir). . ' ~i:nmm ra:c , _~' uxh
<br /> hour sclrrted :~r t:nls esamp4 Li prnc:
<br /> minimum rc:rn UUn ra:e tco:::.. Lc u•s.ul
<br /> on basis of Et•Id :nspcct ion vi ti:r sr:ncr~i
<br />
<br />
|