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52 aletetuine: {1) whether lt was bett€r to estbate ep fron S €ural then ? f!onr P Qp, o! altrrnatlvel,y to atttrat. Tp !a(0 I |'d tr@ % (i1) t-he effect of catcho€nt 4175, anal (ilt) ttle eff,€ct of, trsitrg preallcted rathe! than obBelved Q- o! T- in tie lntehal reLatiooshlps, graphs of 9_ predicted against Q^ observed and T- predicted agalnst T- PPvv observed were plepaled. these shoited that t-he 13 catchnent equallonE gave better correlatiotr coefflclents of Preaucled on observ€al values even l{hen catchnent 41?6 eas lncluded. lhey also shoted tllat predlctlng Q -oPfroe S gave ure hlghest corlelation on 9- observed, but ttle low€r c;rleLatj.on of Tp Pretlicted on Tp obselved' rt itas therefole decid€d ro predict Tp frJn s by equatlon (6) and 9p froo Tp by equation (5'25) ' Each equatlon givl.nq a corlelatlon of 0.65 (note tnis is of siBllar co€f,fic1ent order to that of Pledlcted on observed obca]neil flcm estlDatlng both O and T _tnese frcm s) ' Using eq,.r.tion", unlt hydlog.aPhs \,ete estlDate'l for tfie f,our t'est catchnenas, anal each of the test events was eldulated' Table 22 gives a suDDary of the objectlve erlor frulctlons' cotoparj'son of these ;esults nith tfre ottrer surface routing nodtels shoes that the urllt f,ya.oqt.ptt detioil as ilevelopeal here perforned far r,,orse than-any of the o_th.r-rooaett, partlcuLarly with leqald t'o peak estisatlon' lhls inalicates soroethlng is wrong itlti the analysts, since botlt th€ the of .na th€ Nash cascatle modlels ar6 effectlv€Iy uni! hydrograph oodels ' ""aw tne if.ne of ently ooalel glving a lectangular unlt hydloqraph and t}le Nash cascaale givlng a sDooth curveal unlt hyikogtaPh' It t'toul't be-exPecte'l' aft.r.f..", thit a trrangurar unlt hydloglaph nodel i'ould vield reEufts lnterroeallate bet{een t}rese othe! tvo. hde€d, lf a trlangula! unlt frya.ogr.pn Doalel hail been lflcludea ln t]te Package tiis plobably eoutd tt""" 1."" the case. lloweve!, It l.tae onty aleclded to aPploxlrdale tne catcbment avelage unit hydloglaPh by a tliangle at a late stage' so the lriangular unit hydrograph \tas not conslaler€al ea!l'le!' rhe leason ithv thj.s latter nodel has alone so baallY 16 explalned th€refore by the lalge nuober of events that had to be rejected fron the catchDent averaglng process (fo! t}re other riodels each event Produc€d a lesponse even lf tie itt was not very good), anal atso by the long tlEe lntervat of the ilata ln relation to unlt hyalrograPh tire to peat - cault1ng very unstable indi.vldual unit hyilrogralths. 5.Io Non-Ilnearitv of the sulface loutinq procegs It' nas declateal to lnvestlgate the non-linearliy of the ratnfall-runoff I I I I I t I t I I I I I I I I I
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I I I I I I I I I I I I I I I I CON
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Page 9 and 10: T -l 'l fhe $ork6hoP confin€tl lt
Page 11 and 12: I I 't t t I T I t t I I I I I I t
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Page 15 and 16: I I -f t T I I T t I T I T I t I I
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Page 19 and 20: E t I I I T T I T t I I I I T I I I
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Page 23 and 24: I lr ll lr ll ll t I t I I I t I I
Page 25 and 26: I t I I I I I I I t t shlch l,r cqu
Page 27 and 28: I t I I I I I I I I I I I t T I I I
Page 29 and 30: t I 't L - 1.n9th of tlo{ 1r !, k ,
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Page 65 and 66: I I I I I I I T I I t I ! REFEREIEE
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Page 75 and 76: t I I I = sinul-atlon run 2 = optlm
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Page 89 and 90: I 't 'l ' ?lrl I I t I I t t I t t
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