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<br /> Avera~e Orainage <br />l\:l Area A(rni2) <br />0 Per Channel <br />CJ:l 3 <br />--.! <br /> Average Length <br /> / - <br /> 2 / (L(rni) <br /> a:: / Per Channel <br /> W <br /> I- <br /> W <br /> :e <br /> <l: <br /> a:: <br /> it t/ <br /> u <br /> i= ORDER OF CHANNEL <br /> !!l <br /> a:: 0 <br /> w 2 4 5 <br /> l- <br /> t) / <br /> <l: / <br /> a:: <br /> <l: / <br /> J: <br /> t) -I / <br /> u. / <br /> 0 <br /> C!l <br /> 9 <br /> -2 ORDER <br /> NUMBER <br /> 5 Price River <br /> 4 Coal Creek <br /> -3 3 Major Tributaries <br /> 2 Macrochannels <br /> J Microchannels <br /> <br /> <br /> <br /> <br /> <br />Figure 5.8. Drainage characteristics of the Coal Creek subbasin. <br /> <br />initialization of tbe model at tbe beginning, <br />of the next storm. <br /> <br />To estimate salt uptake in the Coal <br />Creek channel (order 4), the cross-section <br />was divided into equal depth increments <br />(Figure 5.9). An increment of wetted <br />perimeter was associated with each depth. <br /> <br />Salt is routed down the primary channel <br />by assuming that each reach is completely <br />mixed. The assumption tends to lower the <br />magnitude of tbe balograpb but permits a <br />relatively stable, explicit, and simple <br />solution algorithm. A time-averaged mass <br />balance equation is <br /> <br />C(I.J) ~ {C(I,J-l) . V- (I,J-l) <br />+ (Qo(I-l.J-l)'C(I-l,J-~)+Qe(I-l.J)'C(I-l,J)) <br />lit + Qs(I) (C(I-l,J-l~ +C(I-l.J)) <br />lit + M (I) - Ce(I,J-l) 'Qe(I,J-l)' (lIzt))/ <br /> <br />V- (I,J) + Qa (I,J) , (lIzt) <br /> <br />. , . . (5.8) <br /> <br />55 <br />