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I<br />
lr<br />
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ll t<br />
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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