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OPTION N{'}MBER 1 2 3 5 6 7 I SUB.UODEL NAI.IB CONSTANT CONTRIBUTING AREA CONSTANT PROPORTIONALLOSS (A) CONSTANI PROPORTIONA1LOSS (B) PlI] INOEX (A) PHI INDEX (B) VARIABLE COT{IRIBUTING AREA VARIABLE PROPORAIONAI LOSS VARIABI,E PROPORTIONAL Irss (A) (B) NO. OF 'PARAI.IEItRS I 2 2 2 2 2 3 3 3 PARAUETERS DEPS19, DEPSTO, DAPSTO, DEPSTO, DEPSTO, DEPSTO. AIPHA, ALPHA, rthoseparametersun.Ierline.llnillcalethosepalaneterscalculatedi,henvolunes aie forcedl. In the conputing Package, order shown and before the sulface routlng paraneters' SURFACE ROUTING SUB-IIODET,S These sub-noalels deflne the runoff in tltres/sec. ccA PC PC PI{I AO, THETA zot zE zo, zE paranelers should be specified 1n the !,tith the one exception of the Klnenatlc wave sub-model, all the surface routing sub-models are l\rtrPecl dodels' Surface routlng is, in al] cases, accodplished by sone coobtnation of translation and storage routing. Belo{ ls a brlef alescrlPtlo'I of each sub-nodel. The su.b-models ale nunb€ledl accoldlnq to their oplion nunbels. Thete follows a table {hich sudarlses the rcdels anal the lElametels requited. 1. NON-LINEAR RESERVOIR Stolage Equation : S = xQn continuity Equation : f = t - S Routins Equatlon: t -9-n*g"-rff=o 2 parameter nodel: n. K. A1I storage routlDg, no translatlon. Linear reservolr 1s special case with n = l; K 15 then tllDe lag (hours). I t' l t I I I I I I I I I I I I j I
t 'l 't I I I I I I I I I t I t I I 2. (INEMATIC WAVE Derivatlve of the futt St, Venant Equations _ tgnores dlffuslon anat accelerat.ion Lerros i.n dyflanic equdtioo _ justified where Ldteldl lnr row predonlnates- The Chezy equacion is assr:rneai to be dynamic equatlon. e.q. V = Chn for overland ftow v,here C is the Chezy constant and n is the exponent (= ! for the chezy eqn) a satisfactory exanple fot the subcatchrDent raay be divided inao "he up to tO elemenrs either overland of flow or of open-channef gutLer flow. Faram€lers of th; are model the Chezy constant and exponent for each efenent, rhe Aisaavantage of the modet is thar much dara (slopes, lengths, dirnension. i"r-.."n element) and runrine are require.l, tut it srror:lc ;.;;, to its beinq dr. a dlstributed noate_t. CorDpurer pacftage "ir;i;;; effecttreiy up to rrrnrt. 4 elernents; so far: only trieal \dhere Oi"tsiin i"to .f.r"it" closely natches real.ity. 3. TIME OF EIIIRY TradiLional model lhe irput tblough the iime of entry. used in design.!n the U.K. a l-inear t*ne-area dtagra0, ra infall Equivalent to rouring of time base equat to Fure trans]ation, no dynamic storage
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