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…
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…
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…
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…
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…
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…
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…
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…
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",…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
Hi,
Are you referring to SewerCAD or SewerGEMS? And which version are you running?
Regardless, my first tip would be to check the inflow into the wet well. My guess is that the pumps are working fine, but the inflow is not what you expect…
Hello Jack,
It's technically possible to do this, using Modelbuilder. As you mentioned, there is some complexity to the relationship between conditions, actions and controls, which means this can be quite involved. Basically you would need to Sync…
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…
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.