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Water Quality - Salinity
Simple Well-Mixed Salinity Enhancements
Aggregate Diversion Site
The Distributed Annual Salt Loading method now allows Return Flow Salinity Pickup Mass to be specified as an input as an alternative to specifying concentration. The Distributed Salinity Pickup Mass slot was added to display the pickup mass that was re-distributed to each month by the method. Full details about the method can be found Distributed Annual Salt Loading in Water Quality.
A new category, Salt Removal, was added with two new methods, Salt Mass Removal and Salt Mass Removal With Debt, to model water quality improvement projects. These methods allow the user to specify a requested amount of salt mass to remove from a linked Reach at each timestep. The method will not remove more salt than is available in the Reach. Full details about these methods can be found Salt Removal Category in Water Quality.
Maximum Salt Concentration, Minimum Salt Concentration and Salt Storage are three new slots on the Reach when the Mass Balance Salinity method is selected. Maximum Salt Concentration is a required input. Salt in excess of the max concentration will be “stored” in the Salt Storage slot and release on a later timestep. Two slots, Salt Mass Removal and Salt Available For Removal were also added to accommodate the new Salt Removal methods on the Agg Diversion Site.
The simple well-mixed salinity dispatch methods have been revised to now solve the salinity mass balance in terms of mass rather than concentration. They also now treat all flows less than a tolerance (10-8 m3/s) as zero flow, in which case salt mass and concentration are always zero. These changes could result in model differences. A full description of the salinity dispatch methods, including how the new slots are incorporated into the salinity mass balance, can be found Mass Balance Salinity in Water Quality.
Revised: 08/02/2021