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.

Following is a list of all of the water quality slots used by the Reach. The slots are instantiated by the selected method in the Water Quality Routing category. Each of those methods list the slots that are instantiated.