Applies To Product(s): Bentley WaterGEMS, Bentley SewerGEMS, Bentley CivilStorm, Bentley StormCAD, Bentley PondPack, Bentley SewerCAD, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem I'm using GIS data to construct a model that is going to be used to build a water or storm sewer model. What's the best way to prepare the data to make it easy to use with the software's element properties design? Solution 1) Familiarize yourself with the ModelBuilder field mapping step (step 5) and the properties of the elements that you'll be importing in your model. Write down the field names that you want to add to your shapefile or feature class. If you're updating a field that is dependent upon another field being set to a Boolean value make note of it and read the following wiki article . 2) Run a test using ModelBuilder on a small amount of data to understand how the process works. This will allow you to understand which fields you'll need to add to specific shapfiles. For example, elevation invert fields that you want import in for conduits/pipes should be added to the conduit/pipe shapefile if you plan on manually setting the invert (start) and invert (stop) instead of allowing the fields to automatically be populated by the manhole inverts. If you are automatically allowing the invert (start) and invert (stop) to be populated by the software you can omit this field from the conduits/pipes and enter it in the manhole shapefile. You can read more about this in the wiki article linked to above about Boolean values. 3) Create shapefiles or feature classes with the snapping feature on to assure all elements are linked together. This will prevent gaps in connections between elements and your connectivity will be intact the way it was originally connected in the GIS shapefile or feature class instead of allowing the possibility for a misconnection. When creating your shapefile make sure to snap all the lines(pipes) to end points. If you snap the lines to mid-points when Modelbuilder builds your network it will create a junction on the end point of a pipe that is attached to the mid-point of the other pipe, but the pipe won't be attached. When this occurs you'll have to use the batch pipe split tool (Tools > Batch PIpe Split) to connect the lines. For example, if polyline P-1 connects to P-3 below in your GIS shapefile (feature class) at a mid-point as shown in the screen shot below, when constructed in Modelbuilder the junction that is created at the end of P-1 will appear to be attached to P-3, but it will not have actually split the pipe. Instead of having two pipes, say P-4 on the left side of where P-1 splits the pipe and P-5 on the right side you just have one single pipe, P-3. In the diagram below the junction that is created after running Modelbuilder does NOT split pipe P3, therefore, you would have to perform a batch pipe split. The best approach to build your polylines file along with your points features in your GIS and make sure to snap all the elements together at endpoints. If you do this you'll have no trouble creating your network model with Modelbuilder 4) Understand how to use GIS-ID's as your unique identifies for an element . GIS-ID's can be used to maintain a one to one link between your GIS file and the software property element, a one to many link, or a many to one link. There is more information about how this works found in the help documentation under the search term GIS-ID. Some specific help document names are 'GIS-ID's' and 'Preparing to Use Modelbuilder' See Also Converting your model elements to shapefiles Building a model using ModelBuilder WaterGEMS for ArcGIS FAQs SewerGEMS for ArcGIS FAQs
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Wiki Page: Preparing GIS data for use in the hydraulics and hydrology products
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Wiki Page: Santa Barbara Unit Hydrograph Method Support
Product(s): Bentley PondPack, SewerGEMS, CivilStorm Version(s): 08.11.01.56 (PondPack), 08.11.XX.XX & 10.00.00.40 (SewerGEMS and CivilStorm) Environment: N\A Area: Modeling Problem Can the Santa Barbara Unit Hydrograph (SBUH) method be used for catchment runoff calculations? Solution Bentley PondPack PondPack supports SBUH - simply select it from the "Unit Hydrograph Method" dropdown, after selecting Unit Hydrograph as the Runoff Method: Bentley CivilStorm and SewerGEMS Currently, CivilStorm and SewerGEMS do not directly support the SBUH method for catchment runoff calculations. (Enhancement # 317394) As a workaround, if you can externally compute the runoff hydrograph (for example if you have PondPack but want to use CivilStorm), you can insert it (via copy/paste) into the program using the User Defined Hydrograph option in the Runoff Method dropdown in the catchment properties. Related Enhancement: 317394 See Also
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Wiki Page: Automating product activation
Product(s): Bentley WaterGEMS Version(s): 08.11.03.19 Environment: N\A Area: N/A Subarea: N\A Problem Is there a way to automate the activation of WaterGEMS software? Problem ID#: 87905 Solution Bentley doesn't support assisting with the automated licensing across networks but, there are a lot of utilities that can be used to do this. The reason that we don't assist with this is because none of the tools that are out there were written by us so we cannot offer support for them. With that said there I was told that you can use a Windows Group Policy to push the licensing information out across your network. We have a technote located at the link below that contains information about how to do this. http://communities.bentley.com/products/licensing/w/licensing__wiki/defa ult.aspx See Also
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Wiki Page: Product does not show up in the Municipal License Administrator
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD, Bentley SewerGEMS, Bentley SewerCAD, Bentley CivilStorm, Bentley StormCAD, Bentley HAMMER, 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 The Haestad Methods product does not show up in the Municipal License Administrator, even though it shows up in the License Management Tool, with at least 1 seat available. Solution Assuming no restrictions were set on the server side, try the following workaround: 1) Make sure the Municipal License Administrator and License Management Tool are closed 2) Go to Start > Run and click Browse 3) Browse to the file "Haestad.LicenseAdministrator.Gui," located in the WaterGEMS installation folder (C:\Program Files\Bentley\WaterGEMS ) 4) Click Open but don't click OK yet. In the Run window, put your cursor at the very end of the path, put a space and type in the following: /product " ", where the ID will vary by product. For WaterGEMS, the ID would be 1249. For example, your run window should look like this: "C:\Program Files\Bentley\WaterGEMS\Haestad.LicenseAdministrator.Gui.exe" /product 1249 5) Click OK - the Municipal License Administrator should open and you should see WaterGEMS in the list. You can now click it and click Make Default." See Also XM Licensing for Bentley Haestad Products
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Wiki Page: Default license configuration not retaining setting
Applies To Product(s): BENTLEY WATERCAD Version(s): 081.11.01.32 Environment: N\A Area: Licensing Subarea: N\A Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem When attempting to set the default license to one configuration, for example (WaterCAD 500 pipe, AutoCAD, Microstation), then closing and then returning to the Municipal License Administrator (MLA) tool, the license defaults back to the other WaterCAD configuration or no default license configuration appears, for example, (WaterCAD 200 pipe, Microstation) has the ">>>" next to it in the default column. Why? Product: WaterCAD, WaterGEMS, StormCAD, SewerGEMS, CivilStorm, PondPack, SewerCAD Version: 081.11.01.32 Area: Licensing, Problem ID#: 49014, PROBLEMSOLVING See Also: Default, Setting Default, License Management Tool, LMT, Municipal License Administrator, MLT, Making Default, Default License Solution This can occur if you have two or more different license configurations for your site but, one is checked out to the computer that you are trying to change the default license configuration for. In order to fix this problem you need to go into the License Management Tool (LMT) and check the license back in for the user. [Note: SELECT customers don't need to check out licenses to use the software. The program will perform the check in/check out process automatically for you as you open and close the software. ]
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Wiki Page: Memory errors when performing certain tasks
Product(s): Bentley WaterGEMS, Bentley SewerGEMS, Bentley CivilStorm, Bentley StormCAD, Bentley PondPack, Bentley SewerCAD, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N\A Area: Other Problem During normal modeling work or when saving a model, a memory error occurs. Possible symptoms/wording: Insufficient memory available to analyze the current model System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown Solution If the error occurs when attempting to open a model with a large background layer or when attempting to add a large background, see the below article: Out of memory error when loading a background file If the error occurs when saving the model, first check to see if your .WTG file is very large, then see the below article: System.OutOfMemoryException when viewing graphs or saving a model (Solution 500000095642) If the above does not help or if you're encountering the error when doing something else like computing the model, opening Skelebrator, etc, you may be running out of physical memory. If you're working with a very large model, it can occupy a very large amount of memory. If you have other programs open at the same time they take up sections of memory and make it difficult for WaterGEMS to "fit" your model into a contiguous block of memory. This can occur mostly when using the 32-bit version of the product, either in the Standalone, MicroStation, AutoCAD or ArcGIS platform. To check if you're using the 32-bit or 64-bit version of the product, go to Help > About WaterGEMS/WaterCAD (Standalone) or from the WaterGEMS/WaterCAD menu > Help > About, from within the MicroStation, AutoCAD or ArcGIS platform. In the lower left corner next to the date, you will see "64-bit" if using the 64-bit version. If you do not see this then you are using the 32-bit version, which a much smaller memory bandwidth. 32-bit versions are limited to 2 GB (or 3GB if using "3GT tuning") whereas the 64-bit version will essentially use all of your available memory. You can also check your computer's available memory (and whether your operating system is 64-bit), typically via a Right Click > Properties on the 'My Computer' icon on the desktop. Note: Currently, the MicroStation V8i and ArcGIS integrated versions are limited to 32-bit only. If you have a 64-bit operating system and adequate memory, make sure you're using the 64-bit version of our products. There is no separate installation file necessary - both the 32 and 64-bit versions are installed from the same installation file. During installation, setup will detect if you have a 64-bit operating system and install as such. If for some reason it did not install as 64-bit or if you purposely opened the shortcut for the 32-bit version (such as due to limitations with accessing certain data types in modelBuilder and SCADAConnect), you can either reinstall the program, or ensure that you're opening the Standalone version via the WaterGEMS.exe/WaterCAD.exe file within the "x64" subfolder of the product installation folder (by default this is under C:\Program Files (x86)\Bentley\WaterGEMS\x64\ )
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Wiki Page: Adding toolbars to a hydraulics and hydrology product in the Microstation environment
Applies To Product(s): Bentley WaterGEMS, Bentley SewerGEMS, Bentley CivilStorm, Bentley StormCAD, Bentley PondPack, Bentley SewerCAD, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Adding toolbars to a hydraulics and hydrology product in the Microstation environment Solution To add a toolbar, such as the Layout toolbar, in the Microstation environment click on Tools > Tool Boxes. Please see the video below: (Please visit the site to view this video)
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Wiki Page: Error computing model: "Number out of range. Looking for value that is less than lowest table value. Looking for value xxx ft. Lowest table value xxx ft"
Product(s): Bentley PondPack Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Problem When computing a model using an EQT table (Elevation-Flow-Tailwater table) the following user notification is generated: "Number out of range. Looking for value that is less than lowest table value. Looking for value xxx ft. Lowest table value xxx ft" Solution This error message is related to the values in the EQT, or Elevation-Flow-Tailwater, table. EQT tables can be used in the place of pond outlet structures, and are typically paired with outfall that uses the Boundary Condition of "Time-Elevation Curve." The headwater portion of the EQT table needs to be same as the pond elevation. In other words, if the pond elevation is from 10 feet to 20 feet, then the headwater portion of the EQT table needs to use the same elevation. In addition, the tailwater portion of the EQT table should match with the Time-Elevation curve used in with the outfall, or the results may not be valid.
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Wiki Page: Scaled Length difference between Subsurface Utilities products & Haestad standalone products.
Applies To Bentley SewerGEMS, Bentley CivilStorm, Bentley SewerCAD, Bentley StormCAD, SUDA Product(s): Version(s): 08.11.XX.XX Environment: N/A Area: Layout and data input Original Author: Sushma Choure, Bentley Technical Support Group Problem Why Scaled length is measured in different ways in the Subsurface Utilities product & H&H products. Solution When the hydraulic calculations are considered the length is measured from center to center, whereas when you are measuring the length with Subsurface Utilities, the length measured is face to face length. Here is the look at the length measured for hydraulic calculations and using Subsurface Utilities; i.e., lengths measured center to center and face to face. Even if you are importing the project between Subsurface Utilities and Haestad products, the length remains same making no difference in the hydraulic lengths. (See the screenshot below). It shows that the center-to-center length is considered for hydraulic calculations and the Subsurface Utilities product as well. This means even if you are moving the project between these products, there will be no change in the results as center to center length is considered in both the products. Whereas face-to-face length measured in Subsurface Utilities is considered while building the cells and 3D models.
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Wiki Page: Hydraulic grade in conduit immediately downstream of a pump has spike to an unreasonable elevation
Applies To Product(s): Bentley SewerGEMS, Bentley CivilStorm Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem The hydraulic grade in a conduit immediately downstream of a pump has a spike to an unreasonable elevation such as 1500 ft. where the hydraulic grade before and after it are relatively normal. How can I fix this? Background This can be encountered when a model has bad data entry and causes the results to be unstable in one or more locations. The wiki article found here for troubleshooting unstable SewerGEMS or CivilStorm models that use the implicit solver will help. The solution below will focus on what to do with pumps in this situation that appear to be the cause of the problem. Solution One possible cause is that the pump is operating too close to the shut off head, as opposed to a point closer to the center or best efficiency point. Here is the original pump curve: The screen shot below displays a pump curve (blue line) operating too close to the shut off head, which is a flow of 46 gpm. The red line is the system head curve. The system head curve was adjusted using the SewerCAD (GVF-Convex) solver to bring the design point flow much lower, so it intersects at a reasonable point with the system head curve. This was achieved using a trial and error process. The GVF -Rational solver was used because the pressure engine is more stable for pump calculations. The adjusted pump curve and pump curve intersecting the system head curve are shown in the screen shots below: After the changes are made and the new pump curve is assigned to the pump the spike in the conduit hydraulic grade occurs, but the scale is only 12 ft rather than ~1500+ ft. See Also Troubleshooting unstable SewerGEMS and CivilStorm results using the Implicit solver
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Wiki Page: When changing the road cross slope in a model, the gutter spread and depth values are not changing in the results.
Product(s): Bentley StormCAD, Bentley CivilStorm, Bentley SewerGEMS Version(s): 10.xx.xx.xx, 08.11.xx.xx Environment: N\A Area: Output and Reporting Problem When changing the road cross slope in a model, the gutter spread and depth values are not changing in the results. Solution If you are using a catalog gutter, you will need to change the road cross slope and other gutter properties in the catalog gutter dialog. This is because the properties for catalog elements takes precedent over properties in the properties grid. A future release of the product will make this more clear. In the meantime, you can change the road cross slope by opening the catch basin properties grid, selecting the pulldown menu for "Catalog Gutter" and choosing Edit. You can also access the gutter catalog by going to Components > Catalog > Gutter Catalog (in the CONNECT Edition of the software) or Components > Gutter Catalog (in the V8i release). Select the appropriate gutter and change the road cross slope. Once this is open, adjust the road cross slope value. When you recompute the model, the results will change. If you are comparing different road cross slope values, you may want to create a new catalog gutter to use instead of editing the existing one. That way the original gutter properties will still be available if you want to return to those. See Also Why does the gutter need to be define in both the catch basin and gutter element? Why is it that no matter how large the inlet on grade is the gutter spread always remains the same?
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Wiki Page: Is it possible to model a conduit that is larger on the downstream side compared to the upstream side?
Product(s): Bentley StormCAD, Bentley SewerCAD, Bentley CivilStorm, Bentley SewerGEMS Version(s): 10.00.xx.xx, 08.11.xx.xx Environment: N\A Area: Modeling Problem Is it possible to model a conduit that is larger on the downstream side compared to the upstream side? In other words, can a conduit change size as it moves downstream? (be non-prismatic) Solution Conduits are assumed to be prismatic - their section shape and size remains constant along its entire length. If you want to model a conduit where the size is changing, you would need to model the conduit as several conduits with varying size. For instance, consider a case where a conduit that is 60 feet in length and is 12 inches in diameter on the upstream end and 24 inches in diameter on the downstream end. In order to model this change, you will need to model this as more than conduit separated by a transition or manhole element. You could model this as three conduits, each 20 feet in length. The first conduit would be 12 inches in diameter, the second conduit would be 18 inches in diameter, and the third conduit would be 24 inches. Between these would be a transition element at the appropriate invert elevations to account for the slope. If needed, you could use the Element Property Inferencing tool to help define the elevations. If you wanted a finer level of detail, you could use more conduits as well. Another option would be to use the channel and cross section elements, if what you need to model conforms to one of the available types in the cross section element. For more information on this, see the article under "See Also" below. Or, you could accept the prismatic assumption of conduits and select a conservative size for modeling purposes. See Also Are Channels prismatic or non-prismatic?
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Wiki Page: Water quality Analysis during transient events
Product(s): Bentley Hammer Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Problem Can I perform water quality analysis during Transient analysis using Hammer? Background The purpose of this technote is to explain about water quality analysis during transient analysis using Hammer software. As we know water quality plays a major role in any distribution system, so there are always questions about the quality of water during the transient analysis and should this factor be considered or not. Solution The change in water quality in a distribution system during a transient event is essentially negligible as long as there is no any kind of intrusion like soil and earth contaminants into the distribution system. A transient event seldom takes longer than a minute and not much changes in that time can happen in the water quality, that is why water quality analysis during transient event is not considered using Hammer. The major water quality concern during transients is intrusion, if there are cross connections or leaks in saturated soil and the transient pressure becomes negative, contaminants can be pulled into the system. There have been a number of studies on this in recent years, this is why you want to ensure that pressures don't become negative during transient events. Water quality analysis can be performed using WaterGEMS or WaterCAD. Details and more information can be found under See Also section. See Also
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Wiki Page: Design depth of Flow based on average and full flow
Product(s): Bentley SewerGEMS, SewerCAD, StormCAD, CivilStorm Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Problem How do I calculate design depth of flow based on average and full flow? Background Some countries like Israel and India follow their own way of calculating design depth of flow for pipes, based on average and peak/full flow. This technote explains about how to achieve that calculation method results using Bentley Storm-Sewer products. Solution As per the guidelines we know the sewers shall not run full as otherwise the pressure will rise above or fall below the atmospheric pressure and condition of open channel flow will cease to exist. Also from consideration of ventilation sewers should not be designed to run full. In case of circular sewers, the Manning’s formula reveals that: The velocity at 0.8depth of flow is 1.14 times the velocity at full depth of flow. The discharge at 0.8 depth of flow is 0.98 times the discharge at full depth of flow. Accordingly, the maximum depth of flow in design shall be limited to 0.8 of the diameter at ultimate peak flow. Here d is defined as actual depth of flow considering average flow in the pipe and D is full depth of flow considering peak flow. And, q is average flow and Q full flow. To achieve this, we need to set up the formula based user data extension for the manning’s formula for calculating, Velocity at full depth v/V q/Q Once you have setup formula based user data extensions for these values, you can have the design depth of flow values based on these. See Also
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Forum Post: Solution for elevation-area curve is missing in civil storm for pond analysis
Hello, I am analyzing pond in urban storm network design. While designing, i have taken Elevation-Area volume type and initial elevation kept at invert, but it gives me error like "For elevation-area volume type, the elevation-area curve is missing. There must be at least 2 points in the curve" though i have provided values for elevation & area. Total network design is stuck at this position only due to this error. Thanks & Regards, Namita
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Forum Post: RE: Solution for elevation-area curve is missing in civil storm for pond analysis
Please provide the model files (*.stsw, *.sqlite). There are two options for sharing your model on Communities, whichever you choose please be sure to zip your files first. The first option is to attach the zip file containing your model to your reply on the forum using the Advanced Reply Editor (you'll find the link below and to the right of the reply box). If your data is confidential please use the instructions in the link below to send it via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley employees. Please be sure to reply on this thread with the name of the file after it has been uploaded. http://communities.bentley.com/help/w/be_communities_help/7079.be-communities-secure-file-upload
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Forum Post: RE: Engine Error Message
Perfect, thanks Jesse! That did the trick. I'll send you a private message with my info. Thanks again!
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Forum Post: Force main with SewerGems using SWMM engine
Hi, In my sewerGems model I have a pump station with a force main of 2km and 1050 mm diameter. This force main is discharging in a chamber that is also the start of an inverted siphon (to cross a river). I am using swmm engine. In the scenario summary, there is a small continuity and routing error (±1%) but there is a high percentage of non-converging (40%). I'm trying to find the reason of this non-converging high percentage. Here are my questions: I tried to model the force main as a pressure pipe with 6 pressure junctions (because there is slope change in the pipe) and one small virtual pipe between the pump and the first pressure junction. Is it the best way do to it? For the inverted siphon I used a tank on one side of the river and a transition node for the lowest point and the discharge is a manhole. I use gravity pipe. The results seem ok, but is it the best way to represent an inverted siphon? Thank you
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Wiki Page: Element label editing and automatic numbering
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD, Bentley HAMMER, Bentley SewerGEMS, Bentley SewerCAD, Bentley StormCAD, Bentley CivilStorm, Bentley PondPack Version(s): 08.11.XX.XX Environment: N/A Area: Layout and Data Input Original Author: Craig Calvin, Bentley Technical Support Group How to specify automatic numbering format for new elements as they are added to the network. Go to, Tools > Options > Labeling tab From here, you can set how new elements will be labeled for each element type. Buttons Save As : Saves your element labeling settings to an element label project file, which is an. xml file. Load : Opens an existing element label project file. Reset : Resets the values in the 'Next' column to the values that are located in the 'Increment' column. The default value of the increment column is 1. Labeling Table Columns Element : Shows the type of element to which the label applies. On : Turns automatic element labeling on and off for the associated element type. Next : Type the integer you want to use as the starting value for the ID number portion of the label. Bentley WaterGEMS V8i generates labels beginning with this number and chooses the first available unique label. Increment : Type the integer that is added to the ID number after each element is created to yield the number for the next element. Prefix : Type the letters or numbers that appear in front of the ID number for the elements in your network. Digits : Type the minimum number of digits that the ID number has. For instance, 1, 10, and 100 with a digit setting of two would be 01, 10, and 100. Suffix : Type the letters or numbers that appear after the ID number for the elements in your network. Preview : Displays what the label looks like based on the information you have entered in the previous fields. How to edit existing element labels. Elements that have already been placed can be edited in the "Label" field of the Properties grid for individual elements. FlexTables can also be used to edit existing element labels and make it easier to edit multiple elements at a time. All elements in the FlexTable can be edited at the same time by right-clicking on the "Label" column heading, then clicking "Relabel…". The following three types of relabeling operations can be performed: Replace : This operation allows you to replace all instances of a character or series of characters in the selected element labels with another piece of text. Example: P could be replaced with the word Pipe by entering P in the Find field, Pipe in the Replace With field, and clicking OK. P-1 would be replaced with Pipe-1 and so on. Append : This operation allows you to append a prefix, suffix, or both to the selected element labels. Example: Suppose that you have selected the labels 5, 10, 15, and 20, and you wish to signify that these elements are actually pipes in Zone 1 of your system. You can use the append operation to add an appropriate prefix and suffix, such as P and -Z1, by specifying these values in the Prefix and Suffix fields and clicking the Apply button. Performing this operation yields the labels P5-Z1, P10-Z1, P15-Z1 and P20-Z1. Renumber : This operation allows you to generate a new label, including suffix, prefix, and ID number for each selected element. Example: If you had the labels P-1, P-4, P-10, and Pipe-12, you could use this feature to renumber the elements in increments of five, starting at five, with a minimum number of two digits for the ID number field. You could specify a prefix P and a suffix -Z1 in the Prefix and Suffix fields, respectively. The prefix and suffix are appended to the front and back of the automatically generated ID number. The value of the new ID for the first element to be relabeled, 5, is entered in the Next field. The value by which the numeric base of each consecutive element is in increments, 5, is entered in the Increment field. The minimum number of digits in the ID number, 2, is entered in the Digits field. If the number of digits in the ID number is less than this value, zeros are placed in front of it. Click the Apply button to produce the following labels: P05-Z1, P10-Z1, P15-Z1, and P20-Z1. Note: The entry fields displayed depend on what operation is selected. The Preview field displays an example of the new label using the currently defined settings. See Also How do I append a prefix to element labels based on a selection set of elements?
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Wiki Page: Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products?
Product(s): Bentley SewerGEMS, Bentley CivilStorm, Bentley SewerCAD, Bentley StormCAD Version(s): 08.11.xx.xx or higher Environment: N\A Area: Modeling Problem Is it possible to model a weir within a catch basin or manhole in the the storm-sewer Haestad products? Basically a control structure (weir plate, orifice plate, etc) inside the structure vault. Solution It is not possible model a weir directly inside a node, but there are a few workarounds that can be tried, which in most cases should be acceptable. Option 1: conduit control structure First, you can apply a start control structure on the conduit directly downstream of the catch basin or manhole. This would simulate a weir that is right where the catch basin or manhole connects to the downstream conduit. One of the control structure types that can be modeled in this way is a weir. Enter the weir data with elevations expected for the weir within the catch basin or manhole. When the water elevation exceeds the weir elevation, flow will pass into the conduit. This method works best when the invert of the downstream conduit and the invert of the catch basin or manhole is the same. (in other words, "set invert to start?" is set to true, on the downstream conduit). If the outgoing conduit start invert is above the bottom of the node invert, you would need to adjust the weir elevation for the start control structure to account for the drop depth. It is also possible to model this as a stop control structure. The workflow is the same except that the flow through the conduit would not enter the catch basin or manhole until the elevation in the conduit is above the weir. A start control structure may yield more stable results. If you have more than one outgoing conduit, you will need to use one of the other methods below, or add a short "fake" conduit connected between the manhole or catchbasin that contains the weir, and a "fake" node, from which the multiple outgoing pipes connect to. Then, the start control structure can be set on that "fake" conduit. Option 2: pond Another option is to model the catch basin or manhole as a small pond with a pond outlet structure using a weir. In this case, the manhole would be replaced with a pond with the same dimensions as the original manhole. The conduit that drains into the manhole would need to end with an outfall that uses the new pond as the boundary element. A pond outlet structure will need to be added as well. This will be set as the weir. The end result for this will be similar to Option 1 above. If the manhole or catch basin is relatively small in depth and/or diameter, you may need to decrease the time step and the output increment to increase the stability of the results. In addition, if the weir is inside a catchbasin, this workflow would work best when there is no gutter attached. Option 3: structure loss The third option would be model the weir as a structure loss. If you are using the GVF-Rational solver (available in SewerGEMS, CivilStorm or StormCAD) or the GVF-Convex solver (available in SewerGEMS and SewerCAD), you could convert a rating table for the weir into a flow-headloss curve, which is one of the structure loss methods available in this solver. If you are using the Implicit solver, you could use the Standard headloss method. With the right headloss coefficient, you may be able to reasonally match the rating curve for the weir (the rating curve would need to converted to use a head drop instead of an elevation to better see the difference). This will take some trial and error and would in all likelihood end up being an approximation. You may need to superimpose the rating curve of the weir (which can be obtained from the composite outlet structure dialog) with several rating curves based on different headloss coefficients. You could also use the Absolute headloss method based on the head drop seen in the weir rating table for a typical flow. This would allow you to make a conservative estimate for the headloss. In addition, if you are using the Explicit solver for Option 3, you would need to use the Absolute headloss method since the Standard headloss method is not available with this solver.
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