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- . . OuQ57St 3.0- Application of CRSS methods in PRSYM \~ It appears that the use of the !ON;-fT card was tn hAUAr "'rrrm<imate the distribution of salt loadin~ a season. t remains a mystery as to why tons were used r ~ Instead of mg/L and why the pickup of these stations is applied directly to the river. In any case, examination of the code, manuals, and data reveals that it should make no difference to the annual salt loading. The table on the next page shows that computing an equivalent monthly mg/L loading from the tons distribution and using it to calculate the monthly salt loading produces the same annual salt loading as calculated using the input mg/L. Therefore, it is feasible to calculate an equivalent monthly mg/L using the existing monthly tons distribution. This can be done in the input OM!. The constant monthly salt loading data can be mapped directly into a monthly salt pickup time-series. It may possible to ignore the case of only applying TONPCT if the percent shortage is less than 75 percent. Shortages occur infrequently in CRSS and it is rjpt known ~hat the history is behind tile 75 perceot figure. It may also be feasible to apply the 75 percent threshold to all return flows. In addition, it should not matter if salt loading is done to a return flow or to the river. Therefore, it makes sense to be consistent and always apply loading via return flows on the AggOiversion object or element. This also reduces the number of slots required. These steps will simplify PRSYM calculations. The input OMI can also take care of mapping recycled variables to appropriate PRSYM objects and slots. Also for the sake of consistency, all diversions should inherent their quality from the point of diversion. For reservoirs, the diversion quality will always be equal to the reservoir quality. For reaches, if the user has provided a diversion quality, it will be used, otherwise, the diversion quality will be set equal to the reach quality. The TOS methods will recycle existing water quality variables when it is possible to do so without introducing confusion. In the case of confluences, it should be possible to use the existing method and slots by excluding the use of the temperature parameters. ..-, \ ~L' These methods wil~eplicate CRSS output except for error messages and some of the informational messages. An output OMI can De developed for formatted output. A list of slots to support these methods is provided in Appendix B.