TPOutflowRoutingFractionTP,Dest ) x TreatmentPlantPollOutflowTPThe pollution remaining in the treatment plant effluent is carried by the treatment plant return flow links to receiving bodies of water. Flows from a given plant to multiple destinations are assumed to have approximately the same concentrations. Therefore, the pollution streams flowing from a single source are proportional to the volume of flow. Thus, the amount of pollution that flows out of a treatment plant into a return flow link is a fraction of the pollution remaining in the effluent.
TPReturnLinkPollInflowTP,Dest,p = ( TPOutflowRoutingFractionTP,Dest / TPOutflowRoutingFractionTP,Dest ) x TreatmentPlantPollOutflowTP
Some of the pollutant might decay or otherwise be lost as it passes through the return flow link. The pollution that flows out of the return flow link is a fraction (entered as data-see Environment\Pollutant Decrease in Return Flows) of the inflow.
TPReturnLinkPollOutflowTP,Dest,p = (1 - TPReturnLinkPollDecreaseRateTP,Dest,p ) x TPReturnLinkPollInflowTP,Dest,p