In a wastewater collection system, pumps are placed where the hydraulic grade line must be raised. Since sewage primarily flows by gravity, a pump transports sewage from a low elevation to a higher elevation. The sewage then flows again by gravity to the next pumping station or until it reaches its destination.

When you click the pump element on the Layout toolbar, your mouse cursor changes into a manhole pump symbol. Clicking in the drawing pane while this tool is active causes a manhole pump to be placed at the location of the mouse cursor.

Applying a Zone to a Pump

You can group elements together by any desired criteria through the use of zones. A Zone can contain any number of elements and can include a combination of any or all element types.

To Apply a Previously Created Zone to a Pump

1. Select the pump in the Drawing View.
2. In the Properties window, click the menu in the Zone field and select the zone you want.

Defining Pump Settings

You define the settings for each pump in your model in the Pump Definitions dialog box. You can define a collection of pump settings for each pump.

To define pump settings

1. Click a pump in your model to display the Property Editor, or right-click a pump and select Properties from the shortcut menu.
2. In the Physical section of the Property Editor, click the Ellipses (...) button next to the Pump Definitions field. The Pump Definitions dialog box opens.
3. In the Pump Definitions dialog box, each item in the list represents a separate pump definition. Click the New button to add a new definition to the list.
4. For each definition in the list, perform these steps:
5. Type a unique label for the pump definition.
6. Define a new pump definition by entering Head, Efficiency, and Motor data.
7. Click OK to close the Pump Definitions dialog box and save your data in the Property Editor.

Elevation Controls in the SewerCAD Engine

When using the SewerCAD Gradually Varied Flow - Convex (GVF-Convex) engine, user defined on/off elevations will toggle the pump setting based on the HGL at the node immediately upstream of the pump.

Internally, two logical controls will be generated for each pump during the engine loading phase.

For example:

1. If WW-1 HGL > (On Elevation) Then Pmp-1 is ON
2. If WW-1 HGL < (Off Elevation) then Pmp-1 is OFF

You also have the option of ignoring the on and off elevations on the pump using the "Ignore On/Off Elevations?" property. When set to True this allows the user to create more complex logical controls with the existing infrastructure, without worrying about potential conflicting controls.