Wastewater Treatment Plant Return Link Flows

The treatment plant return links transmit treated wastewater from treatment plants (TP) to surface and groundwater (Dest). (Outflow to demand sites for reuse flows through transmission links, not return flow links.) The amount that flows into the link is a fraction of treatment plant return flow (outflow minus the flow to demand sites for reuse).

TPReturnLinkInflowTP,Dest = TPReturnFlowRoutingFractionTP,Dest x TreatmentPlantReturnFlowTP

The amount that reaches the destination (i.e., the outflow from the link) equals the outflow from the treatment plant (i.e., the inflow to the link) minus any losses along the link.

TPReturnLinkOutflowTP,Dest = TPReturnLinkInflowTP,Dest - TPReturnLinkLossTP,Dest

The losses along the link are a fraction of its inflow, where the loss rates is entered as data (see Supply and Resources\Return Flows\Losses).

TPReturnLinkLossTP,Dest = ( TPReturnLinkLossFromSystemTP,Dest + TPReturnLinkLossToGroundwaterTP,Dest ) x TPReturnLinkInflowTP,Dest