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Water Quality
Water User / Agg Diversion Site
Water Quality Salinity Pickup Methods
On the Water User (either as a sequential element in an Agg Diversion Site or as a stand alone water user), new methods were added to better model salinity gains. The water user can add salt using either the Salt Pickup Concentration or Salt Pickup Mass in the Salt Storage and Loading category. These methods behave like the methods of similar names on the lumped structure Agg Diversion Site.
Supplemental Diversions with Soil Moisture Salt on a Sequential Agg Diversion Site
Modifications were made to allow sequential Water Users to model the salinity of Supplemental Diversions with Soil Moisture on a Sequential Agg Diversion Site. Now you can select Soil Moisture Salt Storage with Supplemental Flows from the Salt Storage and Loading category on a water user element when using the sequential structure. With this method, the salinity concentration of the Supplemental Diversion and Supplement Return is tracked in the element and passed on to downstream elements based on the specified links.
Changes to Soil Moisture Unavailable Gain Loss Salt Calculation
Previously, on a water user modeling Soil Moisture, if Irrigated Area increased, then the user would have to specify the Soil Moisture Unavailable Gain Loss and its concentration as there was no way to know how full the soil moisture was or its concentration for the new area. Without specifying values, the code assumed it was full but had no concentration. Thus the total Soil Moisture Salt Concentration decreased.
With this change, the Unavailable Gain Loss will actually show the increase in the volume in the unavailable zone. The concentration is set to the previous timestep's Soil Moisture Salt Conc. This keeps the overall Soil Moisture Salt Concentration from decreasing, but does lead to an increase in Soil Moisture Salt Mass.
Revised: 08/02/2021