See related article in our Wiki: Should I use the inside diameter or outside diameter for the "diameter" field for my pipes?
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Forum Post: RE: Water CAD Pipe Diameters
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Forum Post: RE: Sewer Gems to HAMMER
Hello Amanda, HAMMER cannot directly import a SewerGEMS model, since the file formats are different. Plus, HAMMER would not be able to model the gravity portion of the SewerGEMS model. You would need to recreate the pressure subnetwork in HAMMER in order to model the transient. If there are a substantial number of elements, the best way to do this would be to export the pressure elements into a shapefile format and then import the shapefiles into HAMMER using ModelBuilder. The following link has information on this: Can the storm-sewer products perform a transient analysis in the sewer force mains? If there are only a few products, you may be able to add the elements manually. Regards, Scott
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Forum Post: How does StormCad account for negative pipe slopes for capacity in the calculations?
How does StormCad account for negative pipe slopes for capacity in the calculations?
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Wiki Page: User notification: "Implicit (SewerGEMS Dynamic Wave) engine does not support Daily or Monthly patterns. 1 is used for pattern Daily and Monthly multipliers."
Product(s): SewerGEMS, CivilStorm Version(s): CONNECT Edition, V8i Area: Modeling Problem What does the following user notification mean: "Implicit (SewerGEMS Dynamic Wave) engine does not support Daily or Monthly patterns. 1 is used for pattern Daily and Monthly multipliers." Solution When using pattern loading for the Implicit solver in SewerGEMS and CivilStorm, daily and monthly patterns are not valid. The program will automatically assume that the daily and monthly pattern multipliers are set to 1. While this is done automatically by SewerGEMS and CivilStorm, you may want to manually change the pattern multipliers in the Patterns dialog. The reason for this is because if you decide to use the Explicit SWMM solver at a later point or export the model to EPASWMM format, during the SWMM export process, the daily and monthly patterns are taken into account. If a daily or monthly pattern is set to zero and the day or month in the calculation options is set to one of those with a zero multiplier, the pattern data will not be exported to SWMM.
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Forum Post: Comparison of HGL for pump control
I'm looking for a way to compare 2 tank HGLs for a pump control. For example: If T-1 HGL >= 100 AND T-1 HGL > T-2 HGL Then turn off pump. So I want to turn the pump off when T-1 HGL is greater than 100 but only if T-2 HGL is larger than T-1 HGL. Any thoughts on how to accomplish this?
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Wiki Page: Which Pump Definition Types can be used by the GVF-Convex, Implicit and Explicit solvers?
Product(s): SewerGEMS, CivilStorm, SewerCAD Version(s): 08.11.XX.XX and 10.XX.XX.XX Area: Calculations Problem Which Pump Definition Types can be used by each solver? Solution There are numerous types of pump definitions in Bentley storm and sanitary sewer models. These pump definitions are established by going to Components > Pump Definitions. These definitions can be assigned to any pump element. Pump definitions contain the pump curves describing pump performance. The only curve that is mandatory for modeling a pump is the head curve. Efficiency and motor curves are only used in Bentley water models. Some of the definitions are used only in the implicit and explicit dynamic wave solvers while others are only used in the pressure portion of the GVF-convex solver. The only definition type that is common to all solvers is the Multipoint pump head curve. The chart below shows which Pump Definition Types are available for each of the solvers. Pump Definition Type GVF-Convex Implicit Explicit Constant Power YES NO NO Custom Extended YES NO NO Depth - Flow (Variable Speed) NO YES YES Depth vs. Flow (Type 2) NO YES YES Design Point 1 Point YES NO NO Multiple Point (Type 3) YES YES YES Standard 3 Point YES NO NO Standard Extended YES NO NO Volume vs. Flow (Type 1) NO YES YES See Also Differences between solvers: GVF-Convex vs. GVF-Rational vs. Implicit vs. Explicit (SWMM) Help Topic "Pumps"
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Forum Post: RE: How does StormCad account for negative pipe slopes for capacity in the calculations?
Hello Kyrra, For pipes with a negative slope the "Capacity (Full Flow)" value can be considered the largest amount of water a pipe of that size and slope can carry by gravity. This would apply if there is a flow reversal, which could happen in a dynamic wave run. This link has more information on capacity calculations. Regards, Scott
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Forum Post: RE: WaterGEMS and SewerGEMS
Thank you. would be very glad then
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Forum Post: RE: Creating Thiessen polygons for inlets in StmCAD or CS model
Hi Scott, The "catchment delineation tool sounds a new thing. Was it introduced in the CONNECT edition? I'll give it a look and see how to utilize in our workflow. I'm interested to see how that woks in flat terrains. Also, if you can limit the delineation to a pre-defined work area (say you want the tool to do certain areas while other areas will be defined via other criteria like proximity or manually) Earlier we used what I descried above but utilizing Esri ArcGIS to process the catchments before importing via model builder. See below snapshot for how the catchments within the right of way are defined around the catch basins. Regards AHQ
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Forum Post: RE: Deadpoint
It's a little bit hard to comment without seeing the whole model, but if you have low pressure problems you could: 1. Raise pressure at the water source (but this could waste energy, increase leakage and increase pipe bursts) 2. Install a booster pump station near to where the low pressure problems exist. OR 3. Increase the diameter of the most under-sized pipes. You can use the headloss result to see which pipes cause the most headloss in the system. Regards, Mal
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Forum Post: RE: Deadpoint
Mal is correct. Here's the way I tend to approach this problem. If the pressures are low even when you have little or no demand, you are probably trying to serve someone at too high of an elevation. Use our profile tool. If the pressure drops only during high flow, you probably have a bottleneck in the system where the velocity/head loss is too large. Color code by headloss gradient. Also check to see if the pump has run too far out on its curve. The meeting of 2 pipes is no the reason pressures are low.
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Forum Post: RE: Comparison of HGL for pump control
Hello, You can apply operational controls on the pump in the pump properties. As per your example I have modeled a small network wherein I have specified a few controls on the pump operation. However the control can be set to a particular value only. For example Time > 14:00; HGL >=100 m; Flow > 10 L/s. For comparing the HGL's of two tanks you need to find the relationship between the two tank HGL's and a control can be set such as HGL for T-1>=100 m AND HGL for T-2 >=102 m. Please see the snapshot of the model. If it is not similar to the case you are describing please share your model via the link provided. Link for Uploading Files Here is a relevant wiki article for creating conditions, actions and controls. Creating Controls - Conditions, Actions and Control Sets Regards, Yashodhan Joshi Bentley Technical Support
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Forum Post: RE: Shape sections of conduits
Joshi I searched the book but could not find the formulas I am looking for them (e.g. Catenary shape). The book has some of shapes especially channels. Help document refers to SWMM. From where can I get them?
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Forum Post: RE: Shape sections of conduits
The unansewered question: Joshi I searched the book but could not find the formulas I am looking for them (e.g. Catenary shape). The book has some of shapes especially channels. Help document refers to SWMM. From where can I get them?
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Forum Post: Roughness Type
Hi How manning's n can change over flow or depth (according to Roughness Type). Does Roughness-Flow Curve mean changing Material over depth?
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Forum Post: RE: Shape sections of conduits
Hello Hoshi, The equation for Catenary Shape is available in the Help Menu of SewerGEMS software. Please see attached screenshot. Also can you share what system are you modeling? This will help me in providing a solution to your query. Regards, Yashodhan Joshi Bentley Technical Support
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Forum Post: RE: Roughness Type
Hello Hoshi, Which software are you using? What you are you modeling here? Please provide some details, so that we can help you with your query. Please see related post from Flowmaster, which might help you, if not please elaborate. Flowmaster: Varying Manning's n with flow depth
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Forum Post: RE: Roughness Type
Hello Hoshi, Manning's n also known as Manning's roughness coefficient corresponds to the roughness coefficient of any material. This roughness coefficient depends on the type of material. Hence different materials have different roughness coefficients. The roughness coefficient is not dependent on flow or depth. Thus when a Roughness vs Flow curve is plotted the change in roughness is due to material only.
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Forum Post: RE: SewerGEM - How do i stop a pump from operating if the receiving pond reaches a level in the model.
Hi Sushma,, I have attached another model here. Regards, Boon(Please visit the site to view this file)
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Forum Post: Error creating profile due to a "gutter being part of the path" problem - SewerCAD CONNECT
Hi, I usually right click on a manhole and select "create profile" to see how things look from that location to an outfall. I'm getting this message "unable to create a profile from this node to an outfall. To create profile, there must be a path from the node to downstream outfall and gutter cannot be part of the path". However, if I go an add a profile and track the path manually, it just works, generates the profile and saves it. What is going on? Regard
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