Did you go into Components > Storm Data and create a storm event? If so, after that did you go to Components > Global Storm Events and select the storm event to use for the rainfall alternative?
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Forum Post: RE: regarding storm design
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Forum Post: RE: 2 networks in 1 project
Thank you very much Tom
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Wiki Page: Modeling Reference - Valves Of Various Types [TN]
Applies To Product(s): Bentley HAMMER Version(s): V8i Environment: N/A Area: Modeling Subarea: N/A Original Author: Jesse Dringoli, Bentley Technical Support Group Overview This technote explains how valves of various types work and their typical application in HAMMER V8i. It also provides an example model file for demonstration purposes. How it Works and When to Use it The main "valves" icon on the layout toolbar offers several generic valves: GPV, TCV, FCV, PRV, PSV and PBV. These are sometimes collectively referred to as "valves of various types". These valve elements serve various purposes and are frequently used in steady state or Extended Period hydraulic models. They can generally be categorized as flow control. For example, the GPV defines a curve of flow versus headloss, the FCV (Flow Control Valve) controls flow to a set point and the PRV (Pressure Reducing Valve) controls the downstream pressure to be below a set point. The important thing to understand about these valves is that their controlling effects (pressure reduction, flow control, etc) only apply to the initial conditions calculation (steady state or EPS). For a given steady state or EPS timestep, a specific headloss occurs across the valve. For example, in order for the PSV element to sustain upstream pressure, a specific headloss occurs through the valve, such that in order to balance energy across the network, the upstream hydraulic grade ends up being higher than the PSV set point. During the transient simulation, a discharge coefficient is calculated based on that valve's headloss during the initial conditions timestep. Note: the following equation is used to convert between headloss coefficient and discharge coefficient: H = 39.693 * D^4/Cv^2 Where: D = Diameter (ft), H = Headloss coefficient (K), Cv = discharge coefficient (cfs/ftH20^0.5) It can be re-written as: Cv = ((39.693 * D^4) / H)^0.5 As the transient simulation progresses and the system conditions change, these valves will not automatically react, like they do during the initial conditions. Meaning, if the transient conditions cause a higher flow through a FCV, it will not automatically throttle (change its headloss) to react accordingly. The reason is because HAMMER assumes that these valves cannot react fast enough during the transient simulation. So, they will stay in a fixed position based on the aforementioned discharge coefficient from the initial conditions. However, the user can manually open and close these valves during the transient simulation by using the Operating Rule. The operating rule is an attribute of the valve, found under the "Transient (Operational)" section of the properties. It allows you to define a pattern of Time versus Relative closure, to be using during the transient simulation. For example, if you have a gate valve that is fully open in the initial conditions and you want it to fully close during the transient simulation, you could define your operating rule with a starting relative closure of 0% and pattern that rises to 100% at some point. You would then select that in the valve's properties, under the "Operating Rule" field. You can analyze the effect of various closure patterns either by manually changing the operating rule and re-running the simulation or by creating multiple scenarios, computing a batch run in the scenario manager and then individually examining the transient results. Note: The operating rule designation is stored in the "Transient" alternative. Generally the transient surge will be more severe for a faster closure. So, typically the last bit of closure should occur slowly. For example, the valve may close quickly between 0% and 95% closure, then slowly close for the last 5%. However, you may want to analyze the worst case scenario where the valve is closed too quickly. The speed of closure can easily be reflected in your Operating rule pattern. Note: Do not confuse the Operating Rule with the "Pattern (Valve Settings)" or "Pattern (relative closure)". The latter two fields may be found under the "physical" section of the valve's properties and are used to establish a manual closure pattern for the valve during the initial conditions (EPS) only. For general valve closure purposes such as gate valves, isolation valves, etc, it is recommended that you use the TCV valve type (throttle control valve). This valve represents a standard headloss or discharge coefficient during the initial conditions. So, in the above example of an initially open valve, you would specify the loss coefficient representing the losses through the fully open valve. Initially Partially Closed Valves The TCV also has the ability to model the opening/closing of a valve that is initially partially closed. This is done by way of the "valve characteristics curve" coefficient type and "Valve Type". Normally, the discharge coefficient that the program computes based on what the valve is doing during the initial conditions is interpretted by HAMMER as the fully open position. For example, if you use a GPV, the headloss calculated through it in the initial conditions is always interpretted as a relative closure of 0%, even though in reality, it may be partially closed. This can cause confusion when defining the operating rule. However, with the valve characteristics curve coefficient type for a TCV, the user can define the relationship of discharge coefficient versus relative closure; therefore, a partially closed valve can be properly modeled. Detailed instructions on how to do this are beyond the scope of this technote. For more information, please see Modeling An Initially Partially Closed Valve Custom Valve Characteristics By default, several standard valve types are available, in the "valve type" field (such as butterfly, globe, needle). This essentially defines the discharge coefficient that HAMMER uses for various values of "relative closure" in the operating rule. For example, some valves may have a sharp reduction in area as they start to close and then a slower reduction in area just before they are fully closed. Meaning, a value of 90% closure in your operating rule might not necessarily mean the valve's open area is 10% of the original area. The user can also define a user defined table of relative closure versus relative discharge coefficient, by selecting "user defined" as the valve type. This exposes the "Valve Characteristics" attribute, which is where you would enter the table of relative closure versus relative discharge coefficient to define the characteristics of your valve. The relative discharge coefficient values are relative to the value entered for "Discharge Coefficient (fully open)". Valve Characteristic Curves Valve characterisic cuves for standard types are based on published data (Fok, 1987). The curves have the functional form: 1 – Yk ... where needle valves have k = 2.0; circular gate valves, k = 1.35; and globe valves k = 1.0; or (1 – Y )k ... where for ball valves, k = 1.35; and butterfly valves, k = 1.85. More information can be found at the following paper: Fok, A.T.K., “A Contribution to the Analysis of Energy Losses in Transient Pipe Flow”, Ph.D. Thesis, University of Ottawa, 1987. Note: most valve manufacturers can provide the discharge coefficient(s) Note: When modeling a valve whose initial status is "inactive", ensure that you've entered a value for the "minor loss coefficient". When computing initial conditions, the "minor loss coefficient" is used to compute headloss through the fully open (inactive) valve. This headloss is important since it is used to define the relationship between head loss and discharge as the valve closes. Example Model Click to Download Note: the above model is for example purposes only. It can be opened in version 08.11.00.30 and above and you can find additional information under File > Project Properties. Reference Advanced Water Distribution Modeling and Management - Walski, 2007 See Also Product TechNotes and FAQs Haestad Methods Product Tech Notes And FAQs Protective Equipment FAQ Modeling An Initially Partially Closed Valve General HAMMER V8i FAQ External Links Water and Wastewater Forum Bentley Technical Support KnowledgeBase Bentley LEARN Server
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Wiki Page: How does HAMMER track air pockets introduced with an air valve or discharge to atmosphere element?
Applies To Product(s): Bentley HAMMER Version(s): 08.11.05.61 Environment: N\A Area: Modeling Subarea: N\A Original Author: Scott Kampa, Bentley Technical Support Group Problem Description How does HAMMER track air pockets introduced with an air valve or discharge to atmosphere element? Resolution HAMMER is able to track the volume of air entering and leaving a system at an air valve or discharge to atmosphere element, but the following assumptions/limitations apply: - The air pocket takes up the entire cross section of the pipe - The air pocket is localized at the point of formation (the air valve node). So, the extent of the air pocket along the pipeline is unknown and the air-liquid interface is assumed to be at the node location. (by default) - The reduction in pressure-wave speed that can result from the presence of finely dispersed air or vapor bubbles in the fluid is accounted for by configuring the Wave Speed Reduction Factor in the calculation options. - Air pockets entering an air valve can only exit the system through the same point. Basically it is assumed that the pocket cannot be swept downstream and expelled elsewhere. In most modeling cases these assumptions are acceptable and should not result in significant error. In each case, the assumptions are made so that HAMMER's results provide conservative predictions of extreme transient pressures. Air pocket tracking at air valves and using Extended CAV Since the air pocket is reported at the air valve location, you will need to include the air valve in your profile in order to see air pockets forming in profile view. If your air valves are on a "Tee" from the main line, you will not see air volume reported in the profile, as the air valve element will not be directly included in the profile path. If you need to track the location of the air-liquid interface of an air pocket entering the system (instead of assuming it's localized at the air valve node), you can use the Extended CAV method. To do this, select "True" for the "Run Extended CAV?" attribute, in the transient calculation options (Analysis > Calculation Options > Transient Solver). When a sufficiently large volume of air enters a pipeline, the flow regime evolves from hydraulic transients to mass oscillations. Thus, at least in the vicinity of the air, the system may be represented by rigid-column theory in lieu of the elastic approach. Using the Extended CAV option activates this rigid (inelastic) approach. Besides improved computational efficiency, the rigid approach allows for the tracking of the air-liquid interface. When using extended CAV, the program will automatically switch between the regular (concentrated/elastic) and Extended (rigid) based on the percentage of the adjacent pipe volume that the air pocket occupies. There are two ways to observe the air/liquid interface tracking when using the Extended CAV option: Open the Transient Analysis Output Log under Report > Transient Analysis Reports and scroll down to the section beginning with: *** SNAPSHOT OF EVERY END POINT AT START OF TIME STEP 2 *** Below this table, you will find information pertaining to element statuses, including Extended CAV air/liquid interface. For example: At time step "4341" at CAV "Air Valve" with neighbour "J-3 ", the elevation, level and volume are: 137.000 135.361 0.966 Open the Transient results viewer and animate a report path including the air valve and adjacent pipes. As the pipeline fills with air, you can observe the change in HGL downstream of the air valve. This is the air/liquid interface: In some cases, the extended CAV model may not be appropriate. For example, if you have a triple acting air valve with transition volume, it may not be appropriate since that is more of an elastic situation. The extended CAV option is typically used when relatively large volumes of air enter the system. Note: the Extended CAV option will only track air volume up to the extents of the adjacent pipe(s). In the event that the air expands greatly so that the interface moves down towards the neighbor node to the verge of draining, HAMMER issues a warning message, freezes the horizontal surface at the elevation of the neighbor node, and continues to track the volume (which could conceivably exceed the branch's volume). See Also Modeling Reference - Air Valves Modeling Reference - Discharge to Atmosphere
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Wiki Page: How is the headloss for a weir calculated in the control structure for the storm and sewer products?
Applies To Product(s): Bentley SewerGEMS, Bentley SewerCAD, Bentley CivilStorm Version(s): 08.11.xx.xx Environment: N\A Area: Modeling Subarea: N\A Original Author: Scott Kampa, Bentley Technical Support Group Problem Description How is the headloss for a weir calculated in the control structure for the storm and sewer products? How is the headloss for a submerged weir calculated? Steps to Resolve The solver uses the traditional weir equation and the effective head, which is the difference between upstream and downstream water elevation (or downstream and upstream, if flow is reversed), to calculate the weir flow. If the weir is not submerged the effective head is the difference of water elevation and weir crest elevation. Because of the assumptions of this calculation, the headloss for a submerged weir is not calculated.
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Wiki Page: Updated CULTEC storage chamber library
Applies To Product(s): Bentley PondPack, CivilStorm, SewerGEMS Version(s): PondPack: 08.11.01.56, CivilStorm/SewerGEMS: 08.11.04.54 Environment: N/A Area: Modeling Original Author: Jesse Dringoli, Bentley Technical Support Group Introduction CULTEC Storage Chamber library data has been available for PondPack, SewerGEMS and CivilStorm for some time now, and has recently been updated to include the Recharger® 902HD storage chamber model. This latest version of the CULTEC library will also be included automatically in the V8i SELECTseries 5 release of CivilStorm and SewerGEMS and in any subsequent PondPack versions released after the writing of this article (May 2015) Downloading and Installing To download a copy of this updated CULTEC Storage Chamber library library, click the below link: Download CULTEC.xml Before downloading this file, note the two options below: Option A - If you already have a version of PondPack, SewerGEMS or CivilStorm that includes the CULTEC library, you can simply overwrite the previous copy of the file. To do this: 1) Open the software, go to Components > Engineering Libraries, expand Storage Chambers, expand CULTEC.xml, expand the folders and click one of the individual storage chambers. 2) On the right side, you will see a path shown next to "Engineering Library Source". Make note of this folder path and then close the software. For example the default path to this file for PondPack on a Windows 7 computer is C:\ProgramData\Bentley\PondPack\8\Libraries\ 3) Now, when saving the CULTEC.XML file, choose to save to this location and choose yes when asked if you'd like to overwrite the existing file. 4) Re-open the software and the new sizes will be available in the CULTEC Storage Chamber engineering Library. Option B - If you have one of the compatible versions of PondPack, SewerGEMS or CivilStorm but either do not see an existing Hydro International vortex valve library included, or if you have a problem with it, follow these steps: 1) Download and save the updated CULTEC.xml file to a suitable location on your hard drive (for example PondPack on Windows 7 or 8: C:\ProgramData\Bentley\PondPack\8\Libraries\) 2) Open the software and go to Components > Engineering Libraries 3) Right click on "Storage Chamber Library" in the list and choose "Add existing Library..." 4) Browse to the location where you saved the CULTEC.xml file to and double click it. It should now appear in the engineering library. 6) Click the close button. You can now use the updated CULTEC storage chambers. Using CULTEC Storage Chambers To use the updated CULTEC storage chambers after the above installation: 1) Open the software and go to Components > Storage Chambers. 2) Click the Synchronization Options button (purple book icon) and choose "import from library" 3) Expand CULTEC.xml, select the storage chamber you'd like to use and click "select" 4) The storage chamber will now appear in the Storage Chamber manager and can be selected in any pond in that model. If you'd like to import another storage chamber, repeat steps 1-4. 5) To use a CULTEC storage chamber in the model, open the properties of the desired pond element, select "Storage Chamber System" as the Pond Type and select the CULTEC chamber from the "storage chamber" list. 6) Enter the parameters for the specific chamber system (how many rows, chambers per row, fill depths, etc) What if I Have Multiple Products? If you have more than one compatible product (such as PondPack and SewerGEMS or SewerGEMS and CivilStorm) and would like to use this updated library in both/each of them, follow the same steps above for either option A or option B, for each product. For option A, you would override each pre-existing copy of CULTEC.xml. For option B, you can either save multiple copies of the CULTEC.xml file and browse to each respective file within the product's Engineering Library Manager, or you could simply save a single file and browse to that from each product. See Also
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Wiki Page: Entering Underground Storage Chamber Information [TN]
Applies To Product(s): Bentley PondPack Version(s): V8i Environment: N/A Area: Modeling Subarea: N/A Original Author: Jesse Dringoli, Bentley Technical Support Group Overview The format of storage chamber specifications may differ depending on the manufacturer. This technote explains the format that PondPack expects and how to properly enter your storage chamber. Entering Storage Chamber Information When modeling an underground storage chamber for detention in pondPack, there are five available section types: Circular, Box, Pipe Arch, Depth-Width curve and Incremental volume per unit length. These are defined in the Storage Chamber manager, under Components > Storage Chambers: In many cases, your storage chamber will not exactly conform to a circular, box or pipe-arch shape, and the manufacturer may give specifications on the chamber in terms of a depth-cumulative storage table. Consider the following example manufacturer data: First, it is important to note that the volume information entered in the Storage Chamber manager is for the chamber volume itself, not including additional storage from the surrounding fill. The manufacturer may provide volume information for the "full" or "total system" storage, including the storage provided by the surrounding fill. In PondPack, the fill is accounted for outside of the storage chamber manager (see further below.) In the above example case, let's assume that the given table is for the chamber only, which is what PondPack requires. Let's also assume that the table is for the whole storage chamber and that the chamber is 8 feet long . With this information, the best way to define the storage chamber in PondPack is to use the "Incremental Volume Per Unit Length" storage chamber type. This is selected by clicking the New button and choosing "incremental volume per unit length". You must then enter a table of depth versus incremental volume per unit length, whose unit is cubic feet per foot or cubic meter per meter. You must then enter the "Effective length" of the chamber, which is how long a single storage chamber is. As you can see from the name and units, the table you enter represents the storage volume at each vertical increment (depth) of a one-foot section of the given chamber. This allows you to re-use the same table for a given cross sectional shape, for different total chamber lengths. PondPack simply multiplies the volumes by the "Effective length" to achieve the total storage for the entire chamber. Furthermore, you can see that the table that PondPack requires is in incremental volumes. Meaning, the volume that you enter for each depth is the volume between that depth and the previous depth, not the cumulative volume. Therefore in our example case, you can see that the given table cannot be directly entered, since: It represents the volume of the entire chamber, not just a one-foot section It is a table of cumulative volume versus depth, not incremental. So, we must take the information from the manufacturer and modify it, given PondPack's required format. To change the volumes to represent a unit volume (one foot section), you would simply divide them by the total length. In this case, the chamber length is 8 feet, so you would divide each volume by 8 to get the unit volume: Then, you would convert the table to show incremental volumes instead of cumulative, by subtracting the previous cumulative depth from the current cumulative depth: Now you're ready to enter the data in PondPack. After adding a new Incremental Volume Per Unit Length chamber to the Storage Chamber dialog, click the "Depth-Incremental Volume per unit length" field on the right side and click the ellipsis button next to the "collection". This will open the Depth-Incremental Volume Per unit length table. You can either manually type in the values you computed, or you can copy/paste. To do this, highlight all the cells in your spreadsheet, press CTRL+C to copy, then click the first cell under the Depth column in PondPack and press CTRL+V to paste. Note: make sure the correct units are used. For instance in the above example, depths are in inches. If the depth field in the table is not in the right unit, right click the column header, choose "units and formatting", then change the units accordingly. Next, enter the effective length of a single chamber (8 feet in the example case) and the maximum width. The maximum width is needed because it cannot be derived from the depth-volume curve, but is important when considering the surrounding fill. Setting Up a Storage Chamber System in the Model Now, in order to use the storage chamber in the model and configure the surrounding fill, you must select it in the properties of the pond. For the "Pond Type", choose "Storage Chamber System", then select the storage chamber that you created from the "Storage Chamber" field. Lastly, enter the parameters of the surrounding fill: PondPack takes all the information about the chamber(s) and surrounding fill and constructs an elevation-volume curve to use during calculations. To see this curve, right click on the pond element and choose " Pond Volume Results Table ". CULTEC and StormTech Chambers If you'd like to use a storage chamber from CULTEC or StormTech, PondPack has storage chamber library files available already. These can both be downloaded from selectservices.bentley.com. (note: an update from May 2015 is available here ) Be sure to choose "enhancements and updates" as the download category and "all" for "files posted within the last". The CULTEC.xml and StormTech.xml files can be added to PondPack under Components > Engineering Libraries. Right click "Storage Chamber Library", choose "Add existing library..." and select the .xml file. To import these storage chambers in the storage chamber manager, click the purple engineering library book, choose "import from library", select the storage chamber, then click "select". You'll now be able to use the storage chamber in your model. See Also Product TechNotes and FAQs Haestad Methods Product Tech Notes And FAQs External Links Water and Wastewater Forum Bentley Technical Support KnowledgeBase Bentley LEARN Server
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Forum Post: RE: direction of the flow
Hello, The following support solution might be useful as well: communities.bentley.com/.../20620.flow-arrows-on-pipes-or-conduits-are-pointing-the-wrong-direction Regards, Scott
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Forum Post: Could I trouble tech support to convert an old .wcd WaterCad file for V8i WaterGems use?
These may or may not contain the database. We don't have V7 to find out. There are (2) .wcd's but I've included all files that we've received from our client. If this isn't the place for support of this type please point me in the right direction. If unable to convert, any info about the files or how to proceed would be appreciated as well. Thanks. (Please visit the site to view this file)
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Wiki Page: Error when publishing i-model: Could not load file or assembly
Applies To Product(s): Bentley SewerGEMS, Bentley SewerCAD, Bentley StormCAD, Bentley CivilStorm, Bentley WaterGEMS, Bentley WaterCAD, Bentley HAMMER 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 trying to publish an i-model in WaterCAD/WaterGEMS/HAMMER, the following error occurs: --------------------------- Publish to i-model --------------------------- Could not load file or assembly 'Bentley.ECAttachAddIn.ECPluginFileIO, Version=1.0.0.0, Culture=neutral, PublicKeyToken=4bf6c96a266e58d4' or one of its dependencies. The system cannot find the file specified. --------------------------- OK --------------------------- How to Avoid This issue is due to using the Hydraulics and Hydrology i-model publishing engine with a shapefile background. If the shapefile background is not necessary, remove it from the background layers manager before publishing to i-model. If you need to keep the shapefile as part of the i-model and also have MicroStation or another MicroStation-based product installed, uninstall the "i-model publishing engine for Hydraulics and Hydrology" from Control Panel > Add/Remove programs. The program will then use MicroStation for i-model publishing, which should not be a problem with shapefile backgrounds. UPDATE (May, 2015) - If you must use the I-model export option within the Standalone version, download and install a newer version of the I-model publishing engine from our download site, which includes a fix for this issue. Look for the version with a date of August, 2011, or greater.
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Forum Post: Different values for Depth (in), Depth (Middle) and Depth (Out)
I have modelled a sewage collection network and designed it in SewerGEMS V8i. I am getting different values for Depth (in), Depth (Middle) and Depth (Out) for the conduits. I expect them to be same, as there is no addition/ extraction of flow or, change in diameter, or, change in slope within any particular conduit. (Please visit the site to view this file)
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Forum Post: RE: Could I trouble tech support to convert an old .wcd WaterCad file for V8i WaterGems use?
Please find attached the converted files, which you can open in WaterCAD V8i. Also here is the support solution on converting old watercad files, for your future reference. (Please visit the site to view this file)
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Forum Post: RE: direction of the flow
it's helped me a lot , the topic in your link has fixed my issue . Thanks .
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Forum Post: RE: Different values for Depth (in), Depth (Middle) and Depth (Out)
Depth of water at upstream, downstream & middle of the pipe is different because velocity in & out changes so the depth. These values are same when there is subcritical flow in the pipes. Do you mean you have constant/same slope for all the conduits & no addition flow at each manhole? Because the flow gets added up at each manhole, which increases the velocity & ultimately varies the depth.
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Forum Post: RE: Different values for Depth (in), Depth (Middle) and Depth (Out)
The reason for different depth of water is gradually varying flow in the pipe. Flow is governed by continuity,momentum and energy principal.
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Forum Post: RE: Ladxml SewerGems export to Civil3D doesn't have EGL
Hello Hamid, When you are exporting landxml from SewerGEMS, only HGL gets exported not EGL. It’s because Landxml is not meant to represent hydraulic properties, rather it’s for physical data. Please give us some time to investigate this further, we will see if we have workaround of exporting the profiles to dxf to see EGL or similar.
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Forum Post: RE: Different values for Depth (in), Depth (Middle) and Depth (Out)
Even when flow is constant, the depth and velocity can change when you have some kind of condition that causes non-uniform flow. If the flow at either end is at something other than normal depth, the flow will attempt to reach normal depth along the pipe. Some things that might cause non-uniform flow are a weir downstream, backup from a downstream pipe, transition from subcritical to supercritical flow,...
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Forum Post: RE: Different values for Depth (in), Depth (Middle) and Depth (Out)
Generally the flow in sewer pipes is GVF. Due to friction/slope of pipe there change in specific energy. And at different specific energy the depth of flow will be different until and unless the gravity force and friction force on the fluid are equal (i.e., condition of normal flow) .
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Forum Post: RE: Different values for Depth (in), Depth (Middle) and Depth (Out)
Thanks Sushma, Nawnit and Tom for your help. I tried to design a pipeline will constant flow (sanitary load only at the starting manhole), dia and slope. This should result in uniform flow. However, still the flow depth is gradually decreasing from upstream end to downstream. I have uploaded the Sewergems model.
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Wiki Page: Can SCADAConnect support a connection to ClearSCADA or other SCADA systems besides Citect?
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD Version(s): 08.11.04.57 Environment: N/A Area: Layout and Data Input Subarea: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Description Does SCADAConnect support a connection to ClearSCADA? Answer SCADAConnect allows the interaction with any SCADA system that supports database like Microsoft Access, Microsoft Excel. SCADAConnect also supports database connectivity (ODBC) interface, OLE DB interface or Structured Query Language (SQL) connection interface. Citect's native application program interface (API) is used to allow access to data sampled by the Citect server. SCADAConnect can also import data from a real time or historical OPC server. To use SCADAConnect, the user must identify the properties of the data source being used. If the data source is a data base, as opposed to an OPC server, then the user must first define the connection, which essentially identifies the type of data format (e.g. Excel, Access, ODBC) and the path to that data. If the data source is an OPC server, there is no need to set up a connection as the user need only name the computer on which the OPC server is located and the name of the OPC server. A database source refers to the data being stored in a file. For more information about this please consult our help documentation as there is more information given about SCADA connect that might help answer your question.
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