User Notifications: "Pump On elevation is not in the range of upstream ...." and "Off elevation of pump is lower than ..."

  Applies To 
  Product(s):  SewerGEMS, SewerCAD, CivilStorm
  Version(s): CONNECT Edition, V8i
  Area:  Modeling
  Original Author: Scott Kampa, Bentley Technical Support Group

Problem Description

When validing a model, the following user notifications are generated: "Pump On elevation is not in the range of upstream node bottom elevation and top elevation" and "Off elevation of pump  is lower than supplied node invert."

Steps to Resolve

This issue can occur when the Elevation (On) or Elevation (Off) values for a pump do not coincide with the range entered for the upstream wet well. The most common cause of this is when the wet well Operation Range Type is set to "Level".

There are two Operating Range Types: Elevation and Level. Elevation is simply the water surface elevation related to the ground. However, Level is relative to the base elevation entered for the wet well.

In the screenshot above, the off and on elevation for the pump is 9 ft and 13 ft, respectively. The wet well Operating Range Type is set to "Level" with a base elevation of 8 ft. The minimum level is entered as 8 ft, while the maximum level is entered as 23 ft.

With this setup, the program assumes that the minimum water surface elevation is 16 ft. This is because the operation range "Level" is relative to the base elevation. In such a case, the on and off elevations for the pump are both below the minimum water surface elevation, and the user notification is generated.

To resolve the issue, you need to make sure that the relative values for elevation and level are correct. In the case of the example above, you would want to change the minimum level to 0 ft, which will give the expected results. The alternative would be to change the Operating Range Type to "Elevation". In that case you can simply enter the water surface elevation values directly.