The conceptual framework for TICKET-UWM is based on a well-mixed water column with an underlying oxic or anoxic sediment layer. In the model, metals can enter the water column via surface runoff, storm water flow, groundwater flow, atmospheric deposition, and/or direct discharges. The form of the metal released into the environment (e.g. soluble salt, metal powder, massive) is also considered by specifying kinetic expressions to describe dissolution rates in the water column and underlying sediment layer.
The TICKET-UWM algorithm was constructed as a general solver based upon the Tableau Input Coupled Kinetics Equilibrium Transport (TICKET) numerical engine. Chemical species, chemical equilibrium constants and kinetic rate coefficients stored in external databases that can be edited by the user.
The model is currently able to perform the following calculations: