A Pump (or pump station) is effectively a negative outlet—instead of taking water from the pool and discharging it to the downstream system, it takes water from the downstream system—specifically from another reservoir—and discharges it into the pool. Although the downstream reservoir may not be immediately downstream, a pump outlet creates a virtual pipe between the reservoir that contains the pump and the downstream reservoir. You cannot use a pump to move water from a river into the reservoir. "Figure: Pump Outlet" shows a pump outlet in the Reservoir Editor Physical tab.
Note: Tailwater Elevation must be specified at or above a pump in the Reservoir Tree in order for the pump to determine if it is allowed to operate.
Figure: Pump Outlet
A Pump can be added to the Dam, a Diverted Outlet, or an Outlet Group.
Number of Pumps—Think of a pump outlet as a "Pump Station" in which one or more pumps operate together to meet the pumping objective. Enter the number of identical pumps in the pump station. This value will add rows the Operating Limits table, one for each pump, and will be used as a multiplier on Pump Capacity to determine the total rate at which the pumps can move water.
Operating Limits—this table requires that you specify the operating range for each pump in the pump station. The operating range is defined by a minimum tailwater elevation and a maximum head. The tailwater and head information both rely on a valid definition of the tailwater, so don't forget to add a tailwater element to the pump or to its parent element.
Pump Capacity—Two options are available for specifying the Pump Capacity of each pump in your pump station:
