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<br />MAR~28-2000 TUE 10:46 AM
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<br />Houfilc1(11
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<br />FAX NO.
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<br />p, 06
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<br />"ADLE 2. Ohjl'('Livc Vunr.tion ror :;WI')n or AUllust. ]0. \!lGn.
<br />
<br />STll'IJ, (iniLiul rainfall leu;'!;; in i1'lch"MJ
<br />--i:.i--' a:ii 3.~--".t.Q"---1~~'-.''''-'---oi7'-'''''''''''1':(i'-' 0" - .I.~'.-
<br />
<br />CNS'I'[~
<br />(In(!'hlhuur)
<br />
<br />-('---
<br />.1.0 ~).a
<br />
<br />.---
<br />
<br />.02
<br />.01
<br />.00
<br />.lIR
<br />,10
<br />.n
<br />.11
<br />,lB
<br />,1R
<br />.20
<br />
<br /> .---.-
<br />1815 H3S 1027 (mj 115 512- R12 118:1 1[.7!l 1.:W
<br />10.ts \250 87\ 515 1~:t fi~):l !)()7 1205 lr.:'\(l 1.;(;:1
<br />1509 112R 7HP. 17'/ 1:H fHi 919 1289 1512 11>1;1)
<br />1373 1007 Glj~ 1~-1 1G:l Ci9!"1 mil 1:113 W1G I !,n~l
<br />1273 888 571 3~0 G:07 7S1 10M 1:1:\7 W19 11',I;!)
<br />1103 772 189 38\ 561 809 1078 l:mt ]1)l)2 I f ~(j~ 1
<br />971 OGO 119 100 G~1 8GB ]I~\ ]:1~5 1(j~!) II;';!}
<br />841 SoG 371 1.11 G93 !l'l9 \]G5 Hill 1!i!38 1 r:(i~l
<br />714 461 r:.:::'illlli.1;I 501 7GG DOL 1~W9 113" lfirw. 1r'1:11
<br />..:.....' .",,,!
<br />693 3RB 375 57:.!. 81:1. 10M ]21)., I1G8 l{j()!'j. tl;l;fl
<br /> --
<br />
<br />'l'hfl Rluulcd c,.n indic:att-.a the glcb:sl opLiu1\.lm.
<br />
<br />Va.-ialiorl of the Loss [>aramelers
<br />
<br />The optimunl value. oC STR'l'L and CNSTL for
<br />each of the 20 storms are listed in Table 3 along with
<br />tho corrospontlinll total rainfall losses, Ru.ults for
<br />BTRTI. rnnlf"d from 0,0 to 2.0 inchos for 19 of the 20
<br />.\.Orms, with the lone exception of the storm of Aut:(ust
<br />10, 1969, where the optimum STRTL was 3.1 inches.
<br />ResultIJ for CNSTI. ranged from 0,0 to 0.2 inchlh for
<br />19 of the 20 storms. Here the lone exception was tho
<br />storm of June 30, 1987, which had CNSTl. al 0.26
<br />inchlh. Table 3 nlso shows tbe (lincar) avernglls and
<br />their standard errors,
<br />Surprisingly, optimllm STRTL values were It)s.
<br />affected by seasonal variations tban WI,"e CNS'l'L
<br />optima, Although tho highest Sl'R'rL wns obtained
<br />from a summer storm (Storm 7). STRTL values
<br />obtained from spring and fall storms were comparable
<br />to lhose oblained from winter slorms, In general, hillh
<br />CNSTL values occurred during summer storrns, while
<br />low vl1lues tcnclecl to occur during winter or spring
<br />events. Assuming that STRTL variation is physicnlly
<br />basad, the variation of CNSTL estimt\les uelwcml
<br />storms is due to errors. This is becnu." rormul"tin~
<br />thc rainfall-runoff modcl as Q regn'Hsion involves
<br />makillllllll\lmber of questiollllble assumplion;;. two or
<br />which aro discussed below:
<br />
<br />1, '1'ho assllInption tl1at the rainfall veclor I' is
<br />obscTVocl without stochastic error is el'l'oncoll.~. Conse.
<br />quently, biased l'arl\lIIetcr estimates result (Trout.-
<br />Ulan, 1982). Kuc7.era (1982a) fOU1111 that whcn
<br />systClnatic crrors (unknown to tho modeler) e1<cf'cdu,1
<br />10 l'l>fcont, thc bias in panuneler estimates indnc("l
<br />by input errors (e.g., l'ainfalll Isn dominant factor,
<br />Furlhermore, the unit hydrogrllJlh ordinoto.. used in
<br />Equation (3) were assumed to b" error-free lIlulte
<br />describe accurately the response of the surface walN
<br />
<br />'I
<br />
<br />i
<br />
<br />JAWRA
<br />
<br />runoff lit the Hmdl'ord subbasin, Howevcr, III ,,,,)' ,lud-
<br />ies have shown thal thc g{,ncratcd hy<il'''!:l'tlph
<br />dCllcnd. greatly, for ux;unpla, 011 l,hc limc.ln I'{'"k in
<br />the unit. hyclrogrnph (Singh, 1976; l"ont,line, 1.D\IG),
<br />
<br /> "AUI.b: ;.I,Totitl H.:'I.inr:.lI Losa' nrul J'~Btjm~llf',J J.AI,',!l
<br /> "'nrnmcle-rfC "'rom l';(!lactl"l) HLOl'rIl!>,
<br /> 'fulal
<br />Slorm I..oJiY STI\TI. ('!'ISTl.
<br />Numuf'r Storm Uatc {inch) (inch) (inC'h/ho\lr)
<br />1 Moy 1. 1967 1.29 1.0 11.12
<br />2 May U. 19('1'1 0.18 1,0 o tR
<br />3 lJ<<"mbar 10, 19117 0.81 0,1 (J,lllj
<br />1 May 22. ] 908 0,53 1.8 11,10
<br />5 M,y 25, 19GB ].R9 0,,1 n,n.!
<br />6 Jf1J1uary 17, 19{j!) 2.~1I U.2 ,'Hl
<br />7 A"gu.L Hl, I ~69 3,99 J.1 llll'S
<br />8 April 1. 1~70 l.l (),O ow
<br />9 FC'bru:uy 22. IH7!j 1.81 1.0 (lOI
<br />10 M;l.rl'h 27, Hr15 o.r.m ()2 'I.Of;
<br />II JUIII" I, l~lto 1.97- o,~ /I I ~11
<br />12 April .'10. H.l8~~ (U)4 ()~ 1)111
<br />1:1 Octolll'l' 1, IOUG J,2:i 1.'l ,I rr~
<br />H Ol:tobC'iT 3, lm1G '2.Qr, ~O I' HJ
<br />Ir; JUJH' ;.W. H)87 4,rJ:J l.~ 'I.'.!,"
<br />III Moy 22, 1981) l.fiB 1.0 fl,1O
<br />17 Moy 20, 1989 \,73 1.-1 lilt.!
<br />18 Sc:plr."mlu.r I, Hll;~J 1.75 1A Il,\rj
<br />l~ S<,plamu(,'1' H, l!1A9 1.13 OJ; 1:,12
<br />20 Febl'uary H. l'JUO 1.78 1.0 n 06
<br />^Vl'ru~l' 1.0 .O.l~ 11,1'1', ,rJ.fJlt
<br /> --------
<br />
<br />208
<br />
<br />JOU~NAL or- nlc AM~nlcAN WATER [1r.50"''';'' ^. '." '''',
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