The following changes were made to Water Quality methods.
For the 
Time Lag TDG with Dispersion and Dissipation method in the Water Quality Routing category on reach objects, two new series slots with periodic input were added: 
Max Outflow TDG Concentration and 
Min Outflow TDG Concentration. These new slots now act as bounds on the computed TDG concentration. If the computed Outflow TDG Concentration is outside these bounds, it will be set to the Min or Max. If these two slots do not have input values, the method will behave as before, without bounds. For more information on this method see 
Time Lag TDG with Dispersion and Dissipation in Water Quality.