How does waterCAD calculate the value of Flow Supplied in the reservoir ?.
What Sushma describes applies to a case where there are only demands downstream of the reservoir. In a case where there are other boundary conditions (tank or reservoir), the reservoir outflow will be based on the energy balance - the flow requires for those boundary HGLs to be true, while also satisfying other demands, controls, etc.
See also: Calculation summary: Flow Supplied, Flow Demanded and Flow Stored
Jesse DringoliTechnical Support Manager, OpenFlows ProductsBentley Communities Site AdministratorBentley Systems, Inc.