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Why is the “lag pump count” field not available when selecting Fixed Flow as the “VSPB Type”?

Craig Calvin

Product(s): WaterGEMS, WaterCAD, HAMMER Version(s): 08.11.XX.XX and 10.00.XX.XX Area: Layout and Data Input Problem Why is the “lag pump count” field not available when selecting Target Flow as the “VSPB Type”? How can the…
- over 6 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Wiki
Modeling a Connection to an Existing System

Sushma Choure

Product(s): WaterGEMS, WaterCAD, SewerGEMS, SewerCAD Version(s): V8i, CONNECT Edition Area: Modeling Original Authors : Scott Kampa, Jesse Dringoli, Tom Walski Background If you are modeling only a portion of a larger…
- over 2 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Wiki
Troubleshooting negative pressures at pumps, junctions, & other node elements

Ankit Kulkarni

Applies To Product(s): WaterGEMS, SewerCAD, HAMMER, WaterCAD Version(s): V8i, CONNECT Edition Area: Modeling Original Author: Dan Iannicelli , Mark Pachlhofer, and Jesse Dringoli, Bentley Technical Support…
- 3 months ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Wiki
Error when computing: Reference to a deleted or inactive downstream pipe

Scott Kampa

Applies To Product(s): WaterGEMS, WaterCAD, SewerGEMS, SewerCAD, HAMMER Version(s): CONNECT Edition, V8i Area: Modeling Original Author: Scott Kampa, Bentley Technical Support Group Problem After computing a…
- over 4 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Wiki
Re: WaterCAD flow question

Kim Davis

Hi John: There are a couple of different ways to model this in your system, depending on how much information you have and the behaviour of your pumps. I'm going to assume you're doing extended period simuation modeling, since that's the only…
- over 14 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: can WaterCAD be used for fluid other than water?

Mal Sharkey

Also, the fluids you analyze in WaterCAD should be Newtonian fluids (linear relationship between shear stress and shear strain rate). Wastewater with 2% solids should meet this criteria (you should satisfy yourself of this before running the calcs…
- over 14 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: Pump characteristics

Mal Sharkey

Hi jyoti, What makes you think the residual pressure head of 25m is incorrect? Keep in mind that the pressure in a simple system will equal the tank water surface elevation + the head the pump provides - losses in the system - the elevation of the…
- over 13 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: PRV control (activating when pump turns off)

Mal Sharkey

So you have a logical control on the PRVs that says something like "set PRV pressure setting to 105psi when the pump is off"? I think the problem is that the PRV control isn't checked until after the pump goes off - giving you that 0.1hr delay…
- over 13 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Watercad - Looped System Modeling

Mark Breen

I have a situation where a site is located at the intersection of two streets. There are public mains in both streets and we are examining what would be the result if both mains were tapped. We have hydrant flow tests for hydrants on both streets. Typically…
- over 15 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: System Head Curve

Mal Sharkey

Hi Amine, We get a lot of questions about system head curves in WaterCAD, and most of them come down to the subtle but important differences between how WaterCAD computes them versus how an engineer would compute a system curve by hand. …
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- over 14 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: Pump Curve shape does not match data points.

Mal Sharkey

Hi Karl, Go to Analysis > Calculation Options and edit your existing Steady State / EPS calc option set(s). In the calc options you will find a section called Hydraulics, and in there is an option called "Use Linear Interpolation for Multipoint…
- over 14 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum
Re: Pump Question

Mal Sharkey

To add to what Tom said, option 3B would be to use a "Design Point (1 Point)" pump and compute the head given the power and "rated" flow of 1000 GPM. So assuming 70% efficiency (plus standard values for density and gravity) you can compute that…
- over 14 years ago
- OpenFlows | Water Infrastructure
- OpenFlows | Water Infrastructure Forum