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7. VAIIIABI]E PROPORT:ONAI, IOSS (A)<br />

?hts nodel also allons the responge volume to Lncrease thlough<br />

the events; contrlbutinq atea remalns constant, rrhlle ploportlonal<br />

loss decreases through the event.<br />

Rafurfa11<br />

Intensity<br />

Fractl,on<br />

ehere ZO<br />

ZE<br />

i<br />

P<br />

of<br />

I<br />

Ioss, z, =<br />

l<br />

fraction<br />

c i.s a constant<br />

-li-<br />

*j'Yj<br />

zz+ lzo - zs).-g'J<br />

of, loss a! stalt of ralnfall<br />

of loss at edd of ratnfall<br />

Cont.<br />

area Contributing area =<br />

p- rehere p. is asount of rainfall in lth perlod At<br />

.nd p rs rhe torar rainfatt.<br />

Net ralnfall = Rainfall x (L.O - z.)<br />

J<br />

3 paraneter model : ZO, zE, o<br />

when volunes are forced, d is defined.<br />

8. VARIABLE PROPORT:ONAL LOSS (B)<br />

sane as for 7 except that contrlbuting area = total area<br />

.11<br />

paved area<br />

Rainfall<br />

Depth

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