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58<br />
ttsing. t}le coqci.uslons nentloned above, seven surface routl$g models<br />
wele investlgat'ed. ?le6e rrele subJected to broaitly the san; anatys€s,<br />
the outcone of which r,as a relatlonshlp in each case between one moalel<br />
pdr.ro€ter and catchEent characterlstlcs (sl-ope and ovetland flow f€ngth)<br />
These telatj,onEhlps showed a Balkeal sinllarity, and al1 explalncal<br />
apploxtnately th€ 6aEe percent-rge of the valiance {beti.een 4OC a$il S5t)<br />
1n the optlDls€d pat'a.dete!. Th€ catchnent slop€ exerts the stronge!<br />
cortrol of the tro catchfient charact€rlsttcs in aLl cases. Table 25<br />
Ehoss a atxrolary of the results of th€6e analysei.<br />
I'tre pelfolFancea of the moilels were compated by apptylnq then to four<br />
lndep€ndent catchDeneB whtch had not b€en enptoyed in the ana:.yses<br />
ilescrlbed io the Last palagraph. An analysis of varLatrce on these<br />
lesult6 suggests that, j.n terns of overall fit (least squares), the<br />
llnear reselolr, nonllnea! reservolr anil l{usklngun oodels t'ere<br />
superlor to the othera. In CerDa of peak estlnaCion, thele was nothlng<br />
Co choose between any of the I0odels, Tbe unlt hydroqraph nodel<br />
perfoloeal poo!]y conpaled to the other loodels ln all respects.<br />
In concfusion, a nunber of fully genelallsed nodels have been plesented,<br />
Glven a oeans of €stimatlng the volrrlre of ru[off fron a given rainfal]<br />
evelC (whlch ni1l vary accoriling to cllmate and engj.neering Practlce) ,<br />
any of the surface riouting nodels describeal cou!.d be used to generate<br />
an inlet hydrograph to a sewer systen. Analyses have lndicated that<br />
the choice of srrf,ace routlng moalel 15 less critlcal than the manne!<br />
in whlch tt is ulltisedl. In general, however, a nonlinear model l,'lll<br />
perfolm marginally better than a linear one.<br />
rcKNCIIILEDGEUENTS<br />
Ille eorkshop palticlpants soultl like to acknoHle\ilge lhe conslderable<br />
_oi<br />
.""f.aun"" ttr" totlo"fng rH staff: Robln clarke fot hls help with<br />
ii.-"n.fv"." of varlance, ran Makln for hls organisation of the data<br />
iJ ;i;;ilh the analYses, anal ltark venn for his helP an'l advice on<br />
;;;p;;;s matters. ?h; vlsitlng PatticiPants eoulil lrf:<br />
l: :I-t:.tu<br />
ii.i.<br />
tha.ks to cella Ktrbv for arlanglng for tbelr stav 'o De<br />
so pleasant. "p"cf"f<br />
The lrorkshop was sponsored iointly by the Depart[ent of the<br />
Envlroruoent and the Xn6tltute of ltydrology'<br />
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