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FIGURE 5
DE?IIO.ottll.t
lr=.Olll
on'
2att
C.lchm.ni 91.p.ltl
a lmd||lr
tr !ia[.h
l.n!lor! .nd lotn.rlt9t9l
a
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Relationship betw€en depresslon storage and
catchment sl ope
tlEe. If th€ volule of net lalnfall and the vohee of lunoff are
conBtratned to be equal (le voluroes rforcedr) then the functlon of ti€
losB bod€l 18 llntted to the pledlctlon of tfie teDpolal dlstlllution
of the n6t ralnfall.
Blght Ioas Dodels w€re consid€led fo! the stuallt. A btief outflne of
these Ia giv€n ln Appendln C. Aft4r subjectlve analysi.s of tne ej.ght,
it was c.oDclualed that only thlee allfferent typea of Boflel were lequl.red
to repnesent the oth€ra. ltrese thlee, shich wele then us€d ln tie logs
Doalel cooponent of the atudy, we!e:
(1) Thc constant proportlonal foss loflel, in rhlch the
alepre3Eloll stolage (DEPSt''o) 19 fllst Eubtlactdd, the
reDalnlng loases be1n9 alistrtbuteat as a fLxed proportlon
of ti6 reDalnlng ralnfall perlod (aoe Flgure 7). Ihls
bodel haa t$o pala.Eetela! DEPSTO and the lunoff coeffLclont,
If the volro€g €tle to b€ folced, and DEPSTO ls predlcted
floo equatlon 4.3, then the runoff clefflclent 1s fLxeal.
(ii) the Ph1-lnalex [otlel, ln w]rtch the depressLon Etorage
(DEPsTo), is flrst Bubtracted, after whlch loss takes
place at a constant rate (0) fo! the reDalnder of the