Using hydrant flow curves to check residual pressure for a range of flow

  Applies To 
  Product(s): WaterGEMS, WaterCAD
  Version(s): CONNECT Edition, V8i
  Area:  Output and Reporting
  Original Author: Mark Pachlhofer, Bentley Technical Support Group


Is there a way to check residual pressures at a hydrant or other node for a range of flows? 


With normal base demands entered for your model nodes, you can right-click on a hydrant or junction and choose "Hydrant Flow Curve". This will generate a curve of flow versus pressure. It will run several steady state simulations with various demands on that node, reporting the pressure at the node for each one. For example, if you wanted to see how much flow could pass at 20 psi, you could simply look up the flow for 20 psi on the Hydrant Flow Curve. 

Hydrant Flow Curve vs. Automated Fire Flow

1) During the Hydrant Flow Curve calculations, logical and simple controls are not accounted for. With automated fire flow, simple controls can be accounted for.

2) In addition to being able to display multiple fire flow tests at once, automated fire flow will also allow you to more easily report additional details. For example, automated fire flows can account for zone pressure constraints and system pressure constraints. 

See Also

WaterGEMS and WaterCAD Automated Fire Flow FAQ

Understanding Automated Fire Flow Results

Junction vs Hydrant

  • Created by
  • When: Mon, Aug 10 2015 7:57 PM
  • Last revision by Bentley Colleague
  • When: Fri, Apr 16 2021 3:51 PM
  • Revisions: 6
  • Comments: 0