Following are the user-selectable methods in the Return Flow Salt category. These methods are used to specify how the Return Flow Salt Mass should be calculated. In other words, how much salt is picked up in the return flow from the diversion site.

This is the default method in this category. It does no calculations and instantiates no slots. It is the only available method for the No Structure Agg Diversion Site. Each water user element behaves independently, but each automatically uses the Propagate Salt method.

This method models additional salt added to a lumped Agg Diversion Site. This is the only available method for the lumped Agg Diversion Site when using the Propagate Salt method. It is one of four available methods for the Well Mixed Salt method.

This method models salt on a sequential Agg Diversion Site. This is the only available method for the sequential Agg Diversion Site using Propagate Salt. It does not do any calculations but instantiates slots that can be linked to upstream or downstream objects.

This method is available for Well Mixed Salt on a Lumped Agg Diversion Site. It executes the selected method in the Salt Pickup category: either Salt Pickup Concentration or Salt Pickup Mass. No other calculations are performed.

This method is available for Well Mixed Salt on a Lumped Agg Diversion Site. This method is typically used on a 1‑Month timestep to distribute annual salt loads.

This method is available for Well Mixed Salt on a Lumped Agg Diversion Site. This method calculates Return Flow Salt Mass and Return Flow Salt Concentration based on a salt debt policy if it applies. This can be used to simulate Water Quality Improvement Projects (WQIPs). This method determines if there is sufficient salt in the river to satisfy the WQIP. If not, the amount of salt removal is set equal to the amount available. The Salt Debt slot is used to track the deficiency and the method will attempt to repay the debt in subsequent timesteps.