• WaterGems: Pump controls based off volume pumped, any ideas?

    We have two water pump stations both pumping to an elevated reservoir with the same on/off relative levels, however, PS1 system is fed from elevated reservoir and only needs boosting during peak flows, while PS2 system is fed via a large ground reservoir…
  • Modeling Standpipe and Elevated Storage Tank

    All, I am currently working on creating an existing system model that has both an elevated storage tank (750,000 GAL with 56.50' diameter) and a stand pipe (10,000 GAL with a 12' diameter). My model is running into an issue where the two tanks are not…
  • WaterGEMS Tank Controls to Fully Refill Tank Model Problem

    Hi All, I am working on a fairly basin WaterGEMS model that includes a tank. Based on the junction demands, the tank HGL reduces over time. I have a control set where the tank will start to refill when the HGL has dropped by 5 feet. The tank will…
  • 3 Pump Cycling

    I have a Lift Station that has two force mains and 3 pumps coming out of it. The municipality cycles between each pump through out the day. Is there a way to set up controls to switch between these 3 pumps? I currently have the model set up to cycle between…
  • Alternating Lead/Lag Pumps

    Hello, I am modeling an existing water system in WaterGEMS and I am having trouble implementing the scenario that is used in the existing system. Currently they have 3 pumps in a Lead/Lag system that turn on based on the HGL of the water tower. One…
  • Feature requests

    Background: I am a consultant specializing in water distribution modeling and have been using both WaterGEMS and InfoWater regularly for 9 years. I am therefore, very familiar with the strengths and weaknesses of both platforms. All of these requests…
  • Pumps pumping more water then defined in the pump definitions

    Good Morning, I have a really complicated situation, My model has two reservoir's and each reservoir have two pumps, Reservoir 1 designed to produces 4000 GPM (Combined two pumps) Reservoir 2 designed to produces 1850 GPM (Combined two pumps…
  • Import Controls from Modelbuilder

    Hi, I have site data for PRV's in my model. For flow modulated PRV's I have data such as; PRV-1 Pressure Flow 35 m 5 l/s 38 m 10 l/s 41 m 15 l/s 44 m 20 l/s and for the time modulated PRV's I have…
  • RE: Modeling a Variable Frequency Drive for a submersible pump

    The wiki for modeling a submersible pump explains how to set up a submersible pump layout. For a VFD pump set the property of the pump for "Is Variable Speed Pump?" to "True", set the VSP Type to "Target Head", set the Target Head Type to "Pressure",…
  • RE: Keeping controls separate between scenarios

    Alex, I don't think there is a way to do what you're looking for other than duplicating the control statement itself. When you duplicate the control itself the conditions and actions that make it up are also duplicated. This means that if you change…
  • RE: How to eliminate spike flow at the inlet of the reservoir?

    Azizah, I'm not sure if what I did was correct for how you have your model setup, but I tried to just delete all the reservoirs the you had the named "dummy". After I did that I think I saw the spikey opening and closing pattern problem you might have…
  • RE: How to eliminate spike flow at the inlet of the reservoir?

    Azizah, I've found a solution for your issue. It looks like I was definitely on the right track with what I had referenced above about your controls that reference the same levels on your tanks, but now I can explain a little more about it. The first…
  • RE: How to eliminate spike flow at the inlet of the reservoir?

    Azizah, I'm still looking into your issue. I see the spike that you are talking about, but I'm having a hard time locating the reason it's happening. One thing that I can tell you right now is that it looks like the spikes you are seeing are a product…
  • RE: Description of Controls

    Simbaa, This 'description' area that you're referring to let's you customize the way the description of the control looks in the description area in the blue box. You can also see my post above for the definition of the description if that helps…
  • RE: 48 hrs. EPS run in WaterGEMS

    To give an example of what Wayne and Akshaya mentioned, take a look at the Example1.wtg file included with the program. There are controls to turn a pump on and off based on the elevation of a tank. If you extend the duration, those controls continue…
  • Re: Pump ON and OFF at different levels in Bently Water CAD

    Hello Marek, Your controls don't work because as soon as the level falls below 302.5 and the pump turns on, it immediately fills above 302.5, triggering the Else statement to turn it off. To see a typical example of the controls you're trying to use…
  • Re: How WaterGems manage controls for Extended Period Simulation EPS analysis?

    Hi Alex, The short answer is that WaterGEMS inserts intermediate time steps as required so that controls are properly modeled. For example, if your WaterGEMS calculation time step is 1 hr, but you have a tank that will empty to a 'pump on' level…
  • Re: controling pumps to work for 8 hours only in WaterCAD V8i

    Hi Jasper, To control an element for certain time, you need to create a Time based control. There are two types of time based controls, Clock Time and Time from Start. Most of the time, Clock Time is used in WaterCAD/GEMS as it will allow one to change…
  • WaterCAD FCV Control

    Dear Bentley Community I have been trying to control flow into a 2 MG tank by placing a FCV on the incoming pipe. I've tried: 1. Setting controls, which did not reflect to the FCV flow at all 2. Adding FCV pattern - it only mildly affected the…
  • Help: Modeling multiple operational modes in Water GEMS

    Hi folks, I'm working on a model for a water distribution system that has two different operational modes. The equipment operates on different set-points in each operational mode. There are two pressure zones in the system: Zone 1 (with the water…
  • Re: Modeling Groundwater Wells

    Junos: I just have a small technical followup to Tom's excellent suggestions. If you want to turn any element on/off in the model, you need to use the Controls, which can be edited through Components > Controls in the menu. You'll need to set up…
  • Re: Alternating two pumps in WaterCADV8XM

    Hello, There is no direct way to do this, but if you're creative, you may find a way. For example, you could set up your controls such that when Pump A turns on, it also changes the status of a 'dummy' pipe to closed. The condition to turn it on…
  • Control valve response to transient event

    Is there a way to model the response of a control valve to a transient event beyond manually inputting the transient operational pattern? An example would be what happens to a PSV when the transient pressure drops below the pressure set point.
  • Re: Controlled elements in Watercad

    You might want to post a screenshot of your controls, or alternatively send your model to tech support: http://appsnet.bentley.com/srmanager/addcall.aspx If you were able to get the pump controls going, then you should be able to get the pipe…
  • Re: WaterCAD flow question

    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…