Demand Site Flows

The amount supplied to a demand site (DS) is the sum of the inflows from its transmission links. (The inflow to the demand site from a supply source (Src) is defined as the outflow from the transmission link connecting them, i.e., net of any leakage along the transmission link).

DemandSiteInflowDS = TransLinkOutflowSrc,DS

Every demand site has a monthly supply requirement for water, as computed in Demand Calculations. The inflow to the demand site equals this requirement, unless there are water shortages due to hydrological, physical, contractual or other constraints.

DemandSiteInflowDS SupplyRequirementDS

Some fraction of the water received by a demand site will be unavailable for use elsewhere in the system (i.e., because the water is consumed--lost to evaporation, embodied in products, or otherwise unaccounted for--it disappears from the system.) This consumption fraction is entered as data.

ConsumptionDS = DemandSiteInflowDS x DemandSIteConsumptionDS

Of the inflow that is not consumed, the remainder flows out of the demand site, either to another demand site for reuse, to a wastewater treatment plant for treatment, or to surface or groundwater. Any demand sites directly reusing this outflow will take what they need. The remainder is sent to the various return flow destinations. (These return flow routing fractions are entered as data--see Supply and Resources\Return Flows\Routing.)

DemandSiteReuseOutflowDS1 = TransLinkOutflowDS1,DS2

DemandSiteReturnFlowDS = DemandSiteInflowDS - ConsumptionDS - DemandSiteReuseOutflowDS