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in ascending order and unique. The indices and the <br />corresponding variables are a~ follows: <br />1=Ca, 2=Mg, 3=Na, 4=K, 5=HC03, 0=504, 7=C1, 8=DS <br />Ail regression-coefficient elements should be separated by <br />~ commas. If a node has only some coefficient pairs, any misbinq <br />~ coefficients should be entered as zeros. If a node has no <br />regression coefficients, this node need not be included in SCCOR. <br />~' During WATBALC module execution, if a node is not found in the <br />~ SCCOR file, the following actions will be Laken: <br />1. If the node 15 a 'begin" node, all the concentration values <br />) including DS will be initialized to zero. <br />~ 2. If the node is not a 'begin" node, all mayor ion and DS <br /> concentration values will be carried over from the immediate <br />~ upstream node. If there are more than one upstream node, the <br /> flow-weighted average will be used.. If the sum of the fiowrates <br /> <br />• of the upstream nodes is zero, then the average will be defaulted <br /> to zero. <br /> If ICH(3)=1, the correlation equation used will be the same <br />~ <br /> as that in the case of ICH(2)=1 except instead of (or in addition <br /> to) calculating the ion concentrations from SC, DS will be used <br /> as the independent varialbe. Note that only the valu es of DS <br /> obtained under the options of ICH(i)= 0, 1, or 2 will be used for <br />~ the regression. In no case will the values of DS obtained from <br /> any ICH(2) option be used to compute the ion concentra tions of <br />~ <br /> ICHt3). Because DS is not computed under ICH(3), fourteen <br />~ regression coefficients f7 pairs) should be supplied in file <br /> DSCOR according to the following format: <br />~ <br /> TITLE <br /> ID, A(I). B(1), A(2), B(2). ..., A(7), B(') <br /> <br />c <br />Ex. 13-9 <br />