Diversion Node Flows

Diversion nodes (DN) withdraw water from a river (or another diversion), and this diverted flow becomes the headflow for a diversion. A diversion is modeled in WEAP as a separate river, complete with river nodes, demands and return flows. WEAP will divert only as much water as needed to satisfy the demand sites connected to the diversion, and its instream flow requirements, unless Fraction Diverted is set. The downstream outflow from the diversion node equals the inflows from upstream, plus demand site (DS) and treatment plant (TP) return flows that come in at that point, minus the amount diverted.

DownstreamOutflowDN = UpstreamInflowDN + DSReturnFlowDS,DN + TPReturnFlowTP,DN - AmountDivertedDN

If data has been entered for Fraction Diverted, then

AmountDivertedDN = UpstreamInflowDN * FractionDiverted

Otherwise, AmountDiverted will depend on demands connected to the diversion.