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ltr€ high cost of tfie Provlsion of storD thaLnage ln u!b.'r aleat<br />

places a heavy predlu! on th€ ef,flcient hydrauuc dorlgln of flow<br />

condutts. A natheuatlcat noilel for the convelglon of ralnfall lnput<br />

to a design flow at so[e polnt 1n a sewer syst€D ls one c@ponent of<br />

the essentLal aLesllm process, anil slnce there iE gleat potentlal 1n<br />

construction cost savr.flgs, nuch energv has been expended over tie lasl<br />

faw years towarals the develolnen! of euch noalelg,<br />

The rajnfall-runoff process ln a fully-sewereal utba:r catchleot Dry be<br />

conveniently alivlaleal lnto two! an above-gl.olmal phase coDp!1slng<br />

prlnclpally hydroloqical phenolrena and a below-grounal phaEe whlch la<br />

prlEarily hydraulic, In the past, the teatlng of uoalela against f1e1dalata<br />

has requl-red slDulation of bottl tlese phases, ana !t has never<br />

been certaln as to nhethe! a correct anatrei has been achieved by tr'o<br />

corlect slnulatlons or tlro lncorrect, but conpengating, alEulatlons.<br />

!'or this reason, the 1o91Ca1 step :in the aleveLopnent of noilels haE<br />

been to isolate t}Ie one phase fror0 t-lrr otl.er, and to col.Iect f1e1d data<br />

at tie intelface bet*een the tro phases (or wh€re tbe runoff goes<br />

underglound) . To th16 end, several regealch gtoups engaged ln Dodel<br />

developBenC have eribalkeal oD data coll-ectlon proglauDes !t thls pha6e<br />

bounalaly.<br />

An lnternational wolkshop iras held at the fnstltute durlng April ]978<br />

to bting together these sevelal groupa f,or a conc€ntlated attack on<br />

both tie anal.ysis of, t}|e dala from the dlfferent reseatch catchDents<br />

and to !ev1e$ the porfoleance of sevelal dtff€r€nt oodelUng sttategies.<br />

ttre eorkshop paiticLpant€ (see Plate L) eere as follotrs:<br />

J A van den Belg<br />

GAven<br />

,J FaIk<br />

J NLenczynowlcz<br />

P Jacobsen<br />

R G Mein<br />

Lfssell0eetpoldels Developroent Authotlty<br />

I,elystad<br />

rhe Netherlarals<br />

Departnent of Wate! Resources Eflglneell$g<br />

Universlty of lund<br />

Sl,eden<br />

f,eparteent of Sanltary Englneerlng<br />

fechnical UntveBtty of DenDark<br />

Lyngby<br />

DenEark<br />

Depalloent of Clv1l Engineellng<br />

Monash Unlvelslty<br />

llelbourne<br />

Australla

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