The current implementation of the reach allows the user to model salinity with a simple well-mixed method or a discretized method. Temperature along with any combination of dissolved oxygen and salinity can also be modeled with the discretized methods.

On the reach, slots are added when a method from the Water Quality Routing category is selected (usually automatically based on the Reach Water Quality method); the available Water Quality Routing methods depend on the selected Reach Water Quality method and physical routing method. As a result, the documentation is organized by first listing all the slots, then the user-selectable methods, beginning of run behavior, dispatch slots and finally dispatch methods. Each method specifies whether it is valid for the well mixed or discretized set of methods.