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Solution Approaches : Simulation : Dispatch Methods
Dispatch Methods
Each object in RiverWare has one or more Dispatch Methods. The Dispatch Methods represent the various combinations of inputs and outputs which are valid states for solving the object’s physical process equations. Each Dispatch Method has a list of Dispatch Conditions, a set of slots with required known values and slots with required unknown values. When the required knowns and unknowns are both satisfied, the Dispatch Method can execute. Table 1.1 lists some Dispatch Methods and their conditions for the Level Power Reservoir object.
Note:  For all Dispatch Methods to be able to solve, the previous storage must also be known. This is not in the Dispatch Conditions, but is checked when the object solves.
 
Table 1.1   
Method
Knowns
Unknowns
Solve given Inflow, Outflow
Inflow
Outflow
Storage
Pool Elevation
Solve given Inflow, Storage
Inflow
Storage
Pool Elevation
Outflow
Energy
Solve given Outflow, Storage
Outflow
Storage
Pool Elevation
Inflow
Solve given Inflow, Pool Elevation
Inflow
Pool Elevation
Storage
Outflow
Energy
Solve given Outflow, Pool Elevation
Outflow
Pool Elevation
Storage
Inflow
Solve given Outflow, Storage
Outflow
Storage
Pool Elevation
Inflow
Solve given Energy, Storage
Energy
Storage
Pool Elevation
Inflow
Solve given Energy, Pool Elevation
Energy
Pool Elevation
Storage
Inflow
Solve given Energy, Inflow
Energy
Inflow
Pool Elevation
Storage
User Method-dependent Dispatch Methods
Dispatch Methods are registered with the controller and added to the method table at the beginning of each run. The method table contains a list of all of the potential dispatch methods for an object. Sometimes, the decision as to which Dispatch Methods to add to the method table depends on the selected User Methods. For example, the Dispatch Method listed in Table 1.2 is only added to the dispatch table when the Solve Hydrologic Inflow user method is selected.
In this case, knowing the Inflow, Outflow and Storage does not make the object overdetermined. As long as the Hydrologic Inflow is unknown, the object can dispatch the method to solve for it.
 
Table 1.2   
Method
Knowns
Unknowns
Solve given Inflow, Outflow, Storage
Inflow
Outflow
Storage
Pool Elevation
Hydrologic Inflow
Revised: 12/01/2020