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I<br />

lr<br />

ll<br />

lr<br />

ll<br />

ll t<br />

I<br />

t<br />

I<br />

I<br />

I<br />

t<br />

I<br />

I<br />

t<br />

t<br />

I<br />

whate z. -<br />

zI-<br />

7;E -<br />

l<br />

fractlon of Ioss ln Intcrval j<br />

fractlon of lo6E at 6ta!t of stoaE<br />

f,racti.on of loss at end of €torh<br />

-=- (4.5)<br />

:.alnfall ln lntervrl i<br />

total rslnfall<br />

conattnt<br />

rhus, thla Eod.l is a 3-par€!ate! noalel. the piraDeters belng<br />

zEt zo ,trd o. (Not6 tlat IrEpsTo i5 not I pararbeter fo! this<br />

nodal). Work In th€ Neth€llands (Van clen aerg, 1,9??) suggests<br />

that ZO and ZE carl be estlE ted bv,<br />

MI<br />

orm -<br />

2(1 - 9P) tt pa2e<br />

o.s(l - $<br />

1l P>2Q<br />

rhere Q 1a tho total \roluDe ot lunoft<br />

If.the voj.lDe€ a!9 folced anal ZO and ZE ate aleterDlned ln<br />

thla way, tjr€n d has a value of 2.O2.<br />

4.3 Cooparlron of loss poalels<br />

14.6)<br />

14,7)<br />

({.8)<br />

Ihe thr€e los€ 'Datels rrere coDparedl uslng the ndt_ll,near<br />

tie €urfac€<br />

!ese!vo!,r<br />

routing<br />

as<br />

Dodel. thi oqraeot {n} was ftxed<br />

value<br />

at<br />

of<br />

o.57,<br />

DEpsm<br />

t}le<br />

found froe equation 4.3, ana the patanetjr<br />

fo! each<br />

X-oiar.rr""o<br />

Ddel and eactr catchient oo the c!6b;d";*L*rr*-tair.<br />

objectlve<br />

's,i.tron<br />

functLon.<br />

.t""<br />

ostng th1€ ealue of k ttrc rsn ou1..tiv.<br />

l,at tlr€n evrluated foa each evenl'.<br />

Ihe rerults are glven in TabLeB 4 _ 6.<br />

::ot!:t1g<br />

of tha varue6 glven Ln thes€ trbles shoe6<br />

the<br />

a<br />

ISE objecttve<br />

tenatedcy fo!<br />

tunctlon to alecreaso aE tlra<br />

A<br />

event<br />

lee\onal.te$tton<br />

ahrtatlon lncreases.<br />

of the ob1ectlve functton leat<br />

a nore<br />

t" th;;;;i;;i;<br />

unifo!& valqe roulil<br />

*..<br />

be obtalned wlth<br />

X(observedl<br />

= Root pan gcuare<br />

ltean ordlnate

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