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_.u,.,.,._,y,..,.... ,. <br />optionally either use upstream flows, read indicator variable <br />data from files or use regression Functions tied to hydrological <br />- ~ variables such as streamflows, specific conductance, dissolved <br />` solids, total suspended solids or suspended sediment <br />~ concentrations and to calculate mayor ion and selected trace- <br />metal concentrations for each node in the stream network. In <br />addition, the user can elect as options to print or• to plot <br />~• results from any node. <br />~ A full implementation of the WATBHL model requires execution <br />of both WATBALC and WATBALP modules. However, ehe user may <br />~ choose to execute only the WATBALC module. In such case, thu <br />user should suppress saving the calibration data. If running <br />WATBALP is also desired, then the user should select the option <br />~ to produce the calibration data which will be used in executing <br />~ WATBALP. <br />• After any computer modelling run, the user should always <br />check the warning file (WARNING.DAT) to see if any error or <br />~ warning messages have been produced during the model execution. <br />7.2 Node Designation <br />Before data can be stored in the data files, a scheme must <br />be developed to designate the nodes in a stream network. The <br />~ identification codes of all the ncdes in the WATBAL model will be <br />~ patterned after the USGS 8-digit streamflow downstream numbering <br />system without the first two digits (09 in the case oP the <br />~ Colorado Rivrr Basin). Thus the identi4ication code for each of <br />~ the nodes will be comprised or six digits. This convention is <br />used in all data files (both modules WATBALC and WATBALPI except <br />~• the stream node description dictionary (DICT,DAT), the streamflow <br />data file (~FIL), the concentration data file (CONFIL), the <br />Ex. 13-2 <br />