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3 <br />1 <br />11 <br />u <br />'. • <br />i <br />i <br />_ t <br />1 <br />-- • <br />80 <br />DFS1Gtd OF 5>'.+nlt D.~~ <br />(.anlrv pi OCrdUo <br />___ -_ -~ <br />Example !.-,Maximum Prebn 6le Flood East of fhr 105' .1lcridion-Conlinurd. <br />.. Coinputr trwncalar hcdrnl;raph for rash mrrmcn; <br />of ru nn(f (fits. C9 and 0"_1 as fnllnw~s: <br />(al f~rtrrnu ce trme increment, P, to be used. For <br />the most intrncr prnod of the star nl. :bc time <br />Inrrcmrnt. !I. should 4e at bast as small as onr• <br />IIlth nt fhr lime of ronrrnl ration. <br />III Fnr fhr Grs; imos; Into r.acl f~ hears. D rcdl <br />u suallp Lc I Lour. Fnr rapnt con ccr.tra tlon <br />times (7. less than '4 hoursl, one-~nnl` hear Is <br />the mrcimum pea ctrcul 4me Inrremr:::. D, <br />rrrc:nmrndnl for t~ne moss Imrrsc pcnods. <br />For Icss raped cnr.,•rc;ration ume:,. D for the <br />most intense pencJs mac oe longer. For T- <br />calurs of 10 to 1~ lino rs. a D of :hours is <br />rccnmmrndcC. For T, calucs of IS to a0 <br />liners, a D o' J hours is recommended. <br />(?1 The t:mr prnod, L, map be leeg;hrncd rr, the <br />laser par[ o` :he storm to reduce com puta• <br />tivns. -his .ells result in a pr.nn~r dc.`. n:::rn <br />n.' th.c rrres;:c^. !:m5 0' t!s F. ~~d roC rap~n, bus <br />1: has tittle e:Tect on the deslcr.. <br />(31 F.uno.^. :roe.. t!:= ^Y-:S-:IOCr prnod, i.` ob- <br />:alncd, has I;tac r.^. crt or. drs:cn nn?. :F.a^r• <br />fore, may hr erg~ec:ed. P,uner? hptirocra phs <br />for nr.!_; :he ^rs: =:-hour Prrrod of acslgn <br />storm nrec be computed for w~atersarna h,gc• <br />Ind a T, c: ^_; hours or Icss. <br />(bl For each ume :nten~al, D, compute the ume to <br />peak, T„ base i!mc, T,, and the peak dischar[;c, e.. <br />for 1 inch of runoE. lise equations green on <br />fi ¢. 27. <br />S Dec Jlc .DDlirytion <br />i. lal: <br />(]) For firs: G hours. use D=1 hour. <br />f2} For second v hours, oar L.r, h~~ur.:. <br />For seconJ 1. hears, use C1=1. hears.• <br />i31 Icnore runoT after firs: C: faun as 7~~ -L3 foul <br />•Inrlue,d fee mrorma,on: nor yp LC.tlr m rA,. raamplr. <br />fbl Glccn: <br />T,-~~=0.OT. <br />:S: :1 Q <br />S.= T, <br />T.=".5 hours <br />A=o1 s~. mI. <br />Q= L00 Inch. <br />For D='. hour: <br />c5 hours <br />T._d.G" IJI <br />=1•'. ;hours <br />-0!.; I G I I I l .ftll r <br />=5.P00 ere.-I[. <br />For D=u hours: <br />6 <br />T,=,~-0u tL51 <br />=..5 hours <br />=20 hours <br />;84 1611 11.001 <br />9.=._. <br />7.5 <br />=:5,9;0 sec•ft. <br />For L_1^_ hwrs:' <br />= I~ ~ hm:rs <br />T.c^_.V. 1 IO.iI <br />=_J.0 hours <br />:9; Ifil) (1.001 <br />a•=- io.s <br />=2.910 sec -ft. <br />•InNudrE for mew m.rron' our •pD~~r. We m wn ra.melr. <br />'~ <br />:1 <br />1 <br />