Applies To Product(s): Bentley SewerCAD Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem In SewerCAD V8 Athens Edition, what is the purpose of the "Use Pumped Flows" calculation option? Version: 08.11.00.48 and higher Problem Number: 33543 Solution Flows discharging from a pressure subnetwork into a gravity subnetwork can be treated as fixed flow loads by selecting the Use Pumped Flows option. If this is set to "False,", the discharging load will be recreated as a conbination of dry, wet, and known flows in accordance with the loads entering the pressure subnetwork. In a steady state run, in pressure subnetworks, the flow from the network is calculated using pressure equations, the characteristics of the system, and number of pumps running. For that flow rate to be passed to the downstream gravity system, the user should set this property to "True". In general, setting "Use Pumped Flows" to True is used when the user wants to look at the peak flows when the pumps are running. Setting "Use Pumped Flows" to False will use the loading data into the pressure system, and give more of a true picture as one moves far downstream from the pressure system and the effects of pump cycling become diminished. In this use case, the user will not want to use the pumped flow. Instead, they would pass loading to the downstream system based on upstream loads and appropriate extreme flow factors similar to the way flows are handled in the gravity system.
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Wiki Page: In SewerCAD V8i, what is the "Use Pumped Flows" calculation option? (Solution 500000060361)
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Forum Post: RE: Inserting PRV into WaterCAd V8i
The first place I would check would be to ensure that the PRV isn't in backwards or is closed. This is usually the cause of ridiculous low pressure. This happens when there is no way to get water into the reduced zone.
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Forum Post: RE: CLOSE ISOLATION VALVE!
Hello, I've been got a red user notification about it when close some valve. But value result in downstream and total demand isn't change. In real system all downstream will be outage IF we're close valve. From: Jesse Dringoli [mailto:bounce-Jesse_Dringoli@communities.bentley.com] Sent: Thursday, October 09, 2014 4:09 AM To: HydraulicsandHydrology@communities.bentley.com Subject: RE: [Hydraulics and Hydrology Forum] CLOSE ISOLATION VALVE! View and reply online Replying to this email posts your reply in the thread. Make sure you aren't disconnecting any fixed demands (non pressure-dependent) from a source (tank or reservoir) otherwise they'll pass right through the closed valve and you'll get a red user notification about it. You might also want to take a look at our Criticality tool. communities.bentley.com/.../running-a-criticality-analysis.aspx
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Forum Post: RE: CLOSE ISOLATION VALVE!
I'm tried some radom network simple and complex. It show some red notification when the valve was close, but the value in downstream not change that discrepancy when compare with real system.
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Forum Post: custom turbine quadrant curves in HAMMER
Just wondering whether it's possible to add 'free text' anywhere inside the custom text file where I am defining the specific speed of a turbine? I'm modelling a few different options so it would be good for my own reference purposes to be able to add a line of identifier text containing (for example) creation date and rated conditions. The trial I've done with adding text to the first line suggests not, but I just thought I would confirm. Thanks, Liz
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Forum Post: RE: Inserting PRV into WaterCAd V8i
yea, that's what it was, thanks!
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Forum Post: RE: Help With setting up a VSP or VFD with 4 pumps.
Right on point guys. The LPI update resolved the issue. Tom, Jesse, Mark, and Scott - I appreciate your time.
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Forum Post: RE: Pipe Data Elevation in WaterCAD/WaterGem
Thanks for the details. It looks like the topic of WaterCAD/GEMS data exchange with Civil3D was discussed in a previous thread: communities.bentley.com/.../100349.aspx See post from Mal Sharkey about i-model export capabilities for use with MicroStation and also Subsurface Utilities Engineering. For cases where only AutoCAD can be used, we have an open feature request being considered for the future.
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Wiki Page: Estimating a pump curve for a model
Applies To Product(s): Bentley WaterGEMS Version(s): 08.11.XX.XX Environment: N\A Area: Layout and Data Input Subarea: N\A Original Author: Nancy Mahmoud, Bentley Technical Support Group Problem How do I develop a pump curve if the only known information is the required flow that the pump should supply? Area: Modeling, Problem ID#: 46730 Solution To estimate the head the pump would need to add, add two junctions to the drawing, one before and one after where that pump will be, without connecting them (see screenshot). Then add the required flow on the first junction as positive demand (J-2), and add the same flow as negative demand (inflow) on the other junction (J-1). For example, on J-2 you might have a demand of 1,000 L/s, so on J-1 you would input -1,000 L/s for the demand. The head that a pump would need to add is the difference in hydraulic grade between those two nodes, after running the model. After going through the steps above add a pump element in place of those two junctions (J-1 and J2), then add a one point design pump curve (with the head estimated from above steps). Run the model, then generate a System head curve (by right-clicking on the pump) to size the pump based on it. Note: for a closed system (only demands downstream, no storage) this process will not work since all elements must be connected to a reservoir or tank. Consider using pressure dependent demands in this case (so flow on the system head curve is allowed to vary) or simply size the pump based on the sum of the downstream demands.
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Wiki Page: Disconnected Demand Nodes user notification when computing model
Applies To Product(s): Bentley WaterCAD, Bentely WaterGEMS Version(s): 08.11.xx.xx Environment: N/A Area: Modeling Subarea: Original Author: Scott Kampa, Bentley Technical Support Group Error or Warning Message When computing a model, the following user notification is generated: "Disconnected demand nodes detected; hydraulic results are likely to be compromised." When this happens, I see flow pass through my valve or pipe, even if it's closed. How to Avoid This user notification means that there are junctions in the model that have a demand applied to them but are disconnected from a source, such as a tank or reservoir. In this condition, flow will pass through the closed valve. The reason is because when you enter a demand at a node, you are telling the model that it must satisfy that demand no matter what. So, by closing off a demand, those two things are at odds with each other. The demand is still satisfied, flow goes through the closed valve/pipe and you see this notification. The cause of this can be from any number of settings in the model. For instance, a pump or valve that is closed will stop flow coming from upstream. If there is no other potential source of flow in the system, the demands will not be satisfied. Other areas that can be checked include tank settings. If a tank is empty, it will not be able to supply flow. You can read more about what happens when a tank becomes empty or full here . Make sure that the orientation of your pumps and/or valves is correct. If you have the incorrect downstream link selected (particularly for a pumps) this will inhibit flow from the element. If you have a hydropneumatic tank in the model, make sure the property field "Treat as Junction" is set to False. If it is set to True, the hydropneumatic tank will act like a junction instead of a potential source of flow. Another item to check is the status and connectivity of pipes in the system. If a pipe is set to be closed, it will cut off flow from upstream. It is also possible that a pipe is not connected to the rest of the system. For instance, a pipe may be overlaying another pipe rather than be connected to it. These types of connectivity issues can be difficult to spot visually, but there is a tool called Network Navigator that can be used to find disconnected segments of a model. See the TechNote on Using Network Navigator for more information. If you intentionally cut off the demands by closing the valve or pipe and wanted to see the flow drop to zero, you will need to use the Pressure Dependent Demand (PDD) feature. With PDD, if the pressure drops to zero when closing the valve, the demand will drop to zero. Alternatively, you could simply remove the demands in conjunction with closing the pipe (you could use a new scenario with new demand alternative in this case, to preserve the original demands). Also, if you want to look at the effect on the system of closing off isolation valves, consider the Criticality tool: https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/running-a-criticality-analysis.aspx
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Forum Post: RE: SCS storm event modelling
Ahmed, you would use the method that Sushma mentioned to create a new design storm based on a dimensionless distribution. After you've selected the desired SCS distribution, you'll see a screen where you can enter the total rainfall depth. After proceeding from that step, the time-depth curve will be generated for you, which can be used in the model. If you're saying that you actually have a gauged rainfall event (rather than the synthetic event like with the SCS distributions), then you can create it in the same screen by choosing "return event" instead of "from dimensionless distribution", then enter the table of time vs. depth.
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Wiki Page: Using SCS or other method in StormCAD (GVF Rational solver)
Applies To Product(s): Bentley StormCAD, Bentley CivilStorm, Bentley SewerGEMS Version(s): 08.11.03.83 Environment: N\A Area: Modeling Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem Can I use another method such as the SCS Unit Hydrograph method to calculate peak flows for pipe design? (with StormCAD or the GVF Rational solver in SewerGEMS or CivilStorm) Solution Traditionally, the Rational method is used in storm sewer pipe sizing. This is a standard practice in many locations for pipe sizing. So, this is the only runoff method available in StormCAD (or the GVF rational solver in SewerGEMS and CivilStorm). If you use one of the other available solvers in CivilStorm or SewerGEMS (SWMM and Implicit dynamic) you can model other runoff methods such as the SCS method. If you open the Sample1 model included with CivilStorm for example (located in the Samples folder within the CivilStorm installation folder) you will see that the catchments are configured with the SCS Unit HydroGraph Method. However, if you need to use the automated design feature to size pipes according to peak flow you'll need to use StormCAD or select the GVF Rational solver in CivilStorm, but this only supports the Rational runoff method. If you would like to override the rational method and enter your own peak flows (for example peak from a SCS method runoff hydrograph), for use with automated design, you can use the "Flow (Additional Carryover)" field in the properties of your catchbasins. This basically replaces the rational method with user defined flows. Meaning, you would not have catchments in the model (so no runoff calculations) but rather enter the desired peak flows directly into the catchbasins (and those peak flows could be based on an external calculation from the SCS method for example). You can then set the calculation model to Design in the calculation options and it will size the pipes and inlets as it normally would, except it would be using the user-defined flows that you enter instead of flows calculated from the catchments using the rational method. When you have the active numerical solver set to GVF Rational, you'll see the additional carryover flow field in the catchbasin properties.
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Wiki Page: In the Turbine example file included wit... (Solution 500000089721)
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Layout and Data Input Subarea: N\A Original Author: Scott Kampa, Bentley Technical Support Group Problem In the Turbine example file, the Turbine Curve is set up such that as the flow increases, the values in the Head column also increases. This is different from an expected pump type curve, where the head decreases with flow. Solution Head is the proper terminology for turbines. The "Head" value is basically a head drop, representing the difference in elevation between the intake of the pipeline (penstock) and the turbine. So it is expected that the values will increase with flow.
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Wiki Page: What does the "Head" column represent? It does not seem to correspond to the pressure found in the Time History graphs.
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N\A Area: Layout and Data Input Subarea: N\A Original Author: Scott Kampa, Bentley Technical Support Group Problem Description In the *** Selected Nodes *** section of the Transient Analysis Detailed Report, what does the "Head" column represent? It does not seem to correspond to the pressure found in the Time History graphs. Steps to Resolve The "Head" value in the Transient Analysis Detailed Report represents the head drop across the turbine. This head drop is converted to electrical energy. Basically, the "Head" value in the Transient Analysis Detailed report is the difference between the upstream and downstream head or pressure at the turbine. To confirm this, open a time history graph for pressure at both the upstream and downstream side of the turbine. Select the Data tab and change the units to either ft H2O or m H2O, depending on the units you are using, by right-clicking on the column header and choosing "Units and Formatting." This will make the comparison with the Head value in the Transient Analysis Detailed Report easier. You should see that if you subtract the pressure on the downstream side from the upstream side that this will be the same value for "Head" in the Transient Analysis Detailed Report.
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Wiki Page: The specified module could not be found (Exception from HRESULT: 0x8007007E)
Applies To Product(s): Bentley SewerGEMS, Bentley WaterGEMS, Bentley StormCAD, Bentley SewerCAD Version(s): 08.11.XX.XX Environment: N/A Area: Other Subarea: Original Author: Terry Foster, Bentley Technical Support Group Error or Warning Message When trying to open any model (lesson file, sample file, or existing project) with a .dxf background layer or when importing .dxf through Modelbuilder , the following errors appear: The specified module could not be found. (Exception from HRESULT: 0x8007007E) or : The program can't start because acdb19.dll is missing from your computer. Try reinstalling the program to fix this problem. How to Avoid Option 1 If you're using WaterCAD, WaterGEMS, or HAMMER upgrade to SELECTseries 5 (08.11.05.61) or greater, which includes a fix and if you are using SewerCAD, SewerGEMS, or CivilStorm you should upgrade to SELECTSeries4 (08.11.04.58) then install the latest patch set for that version, which has a fix for this issue. Below is a wiki link with directions on how to download the latest version of the software. https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8175.how-do-i-download-watergems-watercad-hammer-sewergems-sewercad-civilstorm-stormcad-pondpack-flowmaster-culvertmaster.aspx Option 2 Make sure that there is a RealDWG folder in the program installation folder. This is installed with the software. If this folder is missing, download and re-install the software again, but the second install the software by right clicking on the executable file and choosing the "Run as Administrator" option. Option 3 If RealDWG is not the issue, check if you have had a video card driver update recently. If so, try rolling that back, or upgrade to a newer card version. (We have seen this with at least one case with an HP driver for Intel HD 400.) One way to check if it is the video card driver is to boot your computer in safe mode. This will use a different, generic driver. If you are able to open the project in safe mode, this helps to confirm it is a video driver issue. See Also Error opening model with DXF background layer applied: A procedure imported by 'Haestad.RealDWG.Interop" could not be loaded
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Forum Post: RE: custom turbine quadrant curves in HAMMER
Thanks Jesse. We're using the notes field but it would be helpful to be able to read the info in the text file too. Further to this - wondering whether the specific speed in the top line of the text file [SPECIFIC SPEED (US/SI): X / Y] is actually used within the calculation, or whether it is just a text definition which then appears for selection within the transient properties of the turbine? If the latter then we could number them sequentially for example.
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Wiki Page: License usage with AutoCAD integration
Applies To Product(s): Bentley WaterCAD, Bentley SewerCAD, Bentley StormCAD, Bentley PondPack Version(s): 08.11.xx.xx Environment: N\A Area: Licensing Subarea: N\A Original Author: Jesse Dringoli, Bentley Technical Support Group Problem Description License server reports show usage of AutoCAD, yet I never opened the product in AutoCAD integrated mode. I have both a standalone and AutoCAD license of my product. Usage shows up for a license with "AutoCAD" in the feature string, but I did not use the program in AutoCAD integrated mode. Shouldn't I see usage of the standalone license? Solution If the default license configuration is set to one that includes AutoCAD (for example “AutoCAD, MicroStation, 2000 pipes” for WaterCAD), then this license will always be used (and usage logged against it), regardless of whether they are using the program in Standalone or AutoCAD integrated mode. Basically the AutoCAD “feature” is not something that is only “used” when the user opens the program in AutoCAD. Rather, if the user did decide to open the AutoCAD integrated version of the producr (such as WaterCAD for AutoCAD), it checks the license to make sure that “AutoCAD” is included. So, if you see usage for a license whose feature string says “AutoCAD, MicroStation, 2000 pipes” for example, it just means that you had selected this as the default configuration in the Municipal License Administrator (MLA). It doesn’t indicate what platform (standalone vs. AutoCAD vs MicroStation, etc) you had actually used on that computer. If for example you have two licenses of WaterCAD, one for standalone (feature string doesn’t mention AutoCAD) and the other for AutoCAD (feature string mentions AutoCAD), then you will need to be mindful of which of these two licenses is set as the Default in the MLA on a particular computer. So, on a computer where you don’t use AutoCAD for example, you should set it to the standalone WaterCAD license, so that usage is logged under that. On a computer where you may use the AutoCAD interface, you should set it to the WaterCAD license that includes AutoCAD in the feature string (so you are able to open WaterCAD inside AutoCAD if you wish to, and so it logs usage under that). If for example you have two computers and two separate licenses, one for standalone and one including AutoCAD, if both of those computers had their default set to the same entry (for example the one with AutoCAD in the feature), then overusage might be reported if both computers use the product within the same hour. On the other hand, if one had the default set to the standalone license and the other had the default set to the license that includes AutoCAD, usage would be reported to the respective license and no overage would occur. In the event that you have a similar situation like this with two separate licenses of the same product, you could consider combining the license into a single, multiple-seat license (contact your Bentley Account Manager for information.) This way, two computers could be using the same license (same default set in the MLA) without having to worry about overage.
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Forum Post: RE: CLOSE ISOLATION VALVE!
I glad when understood.....Thank Jesse Dringoli
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Wiki Page: How can I limit my users from selecting the wrong products accidently?
Applies To Product(s): Bentley WaterGEMS, Bentley SewerGEMS, Bentley CivilStorm, Bentley StormCAD, Bentley PondPack, Bentley HAMMER, Bentley WaterCAD, Bentley SewerCAD Version(s): 08.11.XX.XX Environment: N\A Area: Licensing Subarea: N\A Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Description My company has the SELECT Open Access program and I see many different hydraulics and hydrology products (WaterGEMS, SewerGEMS, CivilStorm, StormCAD, PondPack, HAMMER,WaterCAD, SewerCAD) listed in the Municipal License Administrator tool. How can I limit my users from selecting the wrong products or product configurations accidently? Resolution What you will need to do is create what are called, "custom activation groups". These will allow you to place your users into a group and limit what licenses they have access to. This wiki technote will explain how you can do that: http://communities.bentley.com/products/licensing/w/licensing__wiki/6467.custom-activation-groups.aspx
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Forum Post: catchment area
is there any automatic method for input Tc, or assign the outflow element to the catchment area to save time ? thanks
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