The Low Flow Periodic Lookup method executes at the beginning of the run. Each timestep in the run is used to look up a value in the Low Flow Requirement slot. The resulting value will be set in the Computed Low Flow Requirement slot. The Low Flow Deficiency slot is computed each time the object dispatches. It is computed as the low flow requirement minus the total control point flow. The Low Flow Reservoirs slot is used by a RPL function (MeetLowFlowRequirement) to determine the reservoir releases necessary to meet the low flow requirement.

The Reservoir Level Lookup method will execute on the Control Point object at the beginning of each timestep. For each timestep (t) in the forecast period, the Low Flow Requirement Reservoir’s previous timestep’s (current timestep‑1) operating level and the forecast timestep’s date (t) will be used to lookup a value in the Level vs Low Flow Requirement slot. The resulting value will be set in the Computed Low Flow Requirement slot. This is an estimated requirement that is used through the forecast period. It is reset at the beginning of the next timestep. Whenever the Control Point object dispatches, it will compute the Low Flow Deficiency based on the flow through the control point. The Low Flow Reservoirs slot will be used by the RPL predefined function to determine the low flow releases. The RPL function will order the reservoirs specified in the Low Flow Reservoirs slot in descending order beginning with the most full (highest level) reservoir. Each reservoir makes a release until the requirement is met or the reservoir reaches its maximum low flow delivery rate.