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be used. If the sum of the flowrates of the upstream nodes is <br />zero, then the averaged concentration will be defaulted to zero. <br />For "begin' nodes, the concentrations of all water-quality <br />C• variables will be initialized to zero in the module. <br />~ If ICH is equal to 1, the water-quality concentrations <br />~ associated with this element will be computed from site-specific <br />regression functions. In each case, the user has to supply in the <br />~ appropriate data file the regression coefficients. <br />~ If ICH(1)~1, then 5C, DS, TSS and SS will be computed as <br />functions of 0 according to the eqution 5 ~ A * ~ •• H. In the <br />~ equation, S is either SC, DS. T55 or SS concentraion; and A and H <br />are the appropriate regression coefficients. Usually, cF:e input <br />value of ~ is used in the equation. If a node has no input <br />~ value, the A value is then taKen as the flowrate from the <br />:~ immediate upstream nodes providing that the regression <br />coefficients for that node are available. The four pairs of <br />• <br />~ regression coefficients should be supplied in file ~COR according <br />~ to the following format: <br />TITLE <br />ID, A(1), B(1), A(2>, B(2), A(3), B(3), A(4), B(4) <br />i <br />~ The first line contains the title which describes the data <br />file. The maximum length of TITLE is BO characters. The ID is <br />the ID o4 the node with 09 omitted. The ID's in the file should <br />~ be in ascending order and unique. Data elements A(1> and B(1) <br />are the regression coefficients (intercept and slope, <br />respectively) as a function of D for SC; A(2) and H(2) are the <br />regression coefficients for DS; Af3) and B(3) are the reyression <br />Ex. 13-7 <br />