I've imbedded my answers below in green. First, some general notes: 1) I was not able to compute your model as-is. Pipe P-121 needed to be made inactive, as it is connected to inactive elements on either end. 2) I noticed you appear to be using a slightly older version, SELECTseries 4, 08.11.04.54. Note that a SELECTseries 5 is also available. •We want to confirm if the pipes defined in the Conduit catalogue are taking part in the design; If yes, are the settings used correct. If not, does changing the settings in the model have any weird effect. Because we did some trial and error and found weird errors. I am sure you will provide us an easy fix and the guidelines on how to do it in proper manner. [Jesse] In the conduit catalog, you're using a conduit class called Circle-PVC/GRP and the "available for design" check boxes are all checked next to the individual pipe sizes, but the checkbox for "available for design" under "Class availability" at the bottom is unchecked. Therefore none of the pipes will be able to be designed (neither the invert nor the size) and you'll see a user notification about this. In order for the class to be available for design, you will need to check that box. If you check the box and re-compute design, you will see the results will change. If this, or the suggestions below do not help, please elaborate on the "weird errors" you're seeing (steps to reproduce, specific message or result you're seeing) •In the Default design constraint dialogue box, we have assigned velocities, slopes and cover as per local municipality criteria. Need your expert opinion on how these constraints effect on model – specially slopes. We would like you to confirm if the slopes defined are correct and behaving properly in the model? [Jesse] See below article for details on how the automated design uses constraints: http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/18162.what-is-the-order-of-the-design-priorities-used-in-stormcad-gvf-rational-solver-and-sewercad-gvf-convex-solver Since I'm not familiar with your local standards, I'm not sure if the constraints you've entered are correct. However, here are some observations: 1) You've entered table-based constraints where the min and max slope are set to the same value. Attempting to fix/set the slope of a pipe like that will give the program more strict constraints and no freedom for the Design solver to vary the slopes. This means it will be even harder for it to meet other constraints. 2) The "Rise" values that you entered in the slope constraints table seem to match up with the "size" labels seen in the conduit catalog (for example 200, 250, 315 mm). However, the constraints refer to the inside diameters as defined in the conduit catalog, and in your case, some of them are much smaller than the label "size". For example a pipe with "size" of "315 mm" has an inside diameter of 285 mm in your conduit catalog, which falls between the diameter of 250 and 315 mm that you entered in the "rise" column of the table based constraints. Basically if the entry of "315" in the slope constraints is supposed to be for pipes with a "size" of "315 mm", then the "rise" needs to be adjusted to match the inside diameter of 285 3) It appears your model has suffered from a known issue in SELECTseries 4 related to deleting and renaming a size in the conduit catalog. This causes the diameter to not display correctly for such sizes. In this model, the size "500mm" seems to have this problem, so you may see conduits with a "size" of "500mm" but with "Diameter" of something else. The issue that caused models to have this problem was fixed, so this will not happen to models in future versions of SewerGEMS (such as the latest, 08.11.05.58). To fix this model, copy/paste the contents of your catalog class to a new catalog class, delete the old one, the global edit the catalog class and size fields in the conduit tables. After recomputing design, the correct diameters should display for each conduit and for the large majority of pipes, the calculated slope should be equal to the design constraint. • Please note that client has relaxed the maximum depth – At present we are getting 13.0 m depth at the principal pump station (PMP-8) from the attached model. Kindly note that model has 3 lift stations and principal pump station. We would like to confirm if this depth is applicable after your fix. [Jesse] Can you clarify what you are asking here? Are you asking in general if a cover of 13 m is too much, or are you saying that you're seeing a cover of 13 m in the model after automated design and wondering if the program is working correctly? After fixing the above issues (500mm diameter entry and "available for design" checkbox) I do see a cover of just under 13 m at the conduit connecting to wetwell W-8. The reason is mainly due to your slope constraints and flat ground profile. Slope constraints are higher priority than maximum cover (see above linked article on design priorities) so since you're attempting to fix/set the slopes, they essentially override and take precedence over the maximum cover. When I gave some range between the min and max slope, cover was reduced (though at the expense of velocity) • Major issue in the model is the Velocities – we are not able to achieve self-cleansing velocities in 75% of the model pipes with the given design constraints. Just for your information we need minimum 0.70 m/sec velocity. [Jesse] This may in part be due to the issues mentioned above, but again are mainly due to the design priorities (see article linked further above) along with the topology of your model. As you can see from the article (part of which is also mentioned in the Help documentation) Minimum Velocity is lower than most other constraints. So, your strict slope constraints may in part be causing this. Also see this article for more: communities.bentley.com/.../12710.unable-to-meet-minimum-or-maximum-velocity-constraint Are additional pumping stations a consideration? •We are not sure how the design priorities are being used based on the provided design constraints. We will appreciate some more guideline on this. [Jesse] The design solver generally takes a conservative approach in its assumptions, though engineering judgment will always be needed to refine the end design. Again, see the Communities article or help topic "Design Priorities" for detailed information. http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/18162.what-is-the-order-of-the-design-priorities-used-in-stormcad-gvf-rational-solver-and-sewercad-gvf-convex-solver
↧
Forum Post: RE: Urgent Help needed For attached Sewergems Model
↧
Forum Post: RE: Paradoxical in Results (Trace)
Scott What I understand is that a Junction must be a SOURCE (has inflow to network) to solve calculations correctly and if a Junction has not inflow and has been set as Trace Source, calculations maybe be calculated incorrectly. Am I right? Sim
↧
↧
Forum Post: Pie Charts
Hi Would anyone explain how values of 'Pie Chart' in below charts has been calculated? Sim
↧
Forum Post: RE: How to name(number) the junctions and pipes to follow the general direction of water flow in WaterGEMS V8i?
Hi Scott, The link did help. Thank you. Thanks & Regards Pankhuri
↧
File: System Head Curve
Hi I need help in developing the System Head Curve for a project where the Pumping is Downhill as can be seen in the attached model. Appreciate your urgent advise please kind regards Farhan Malik Seniot Water Engineer, CH2M
↧
↧
Wiki Page: SELECTsupport TechNotes And FAQs
The following TechNotes and FAQs are provided as a reference by Bentley's Technical Support Group. Licensing Pre-XM Licensing of Bentley Haestad Products Overview of SELECTserver licensing for Hydraulics and Hydrology products SELECTserver license Troubleshooting General SentinelLM Server FAQ XM License Configuration General Compatibility Chart [[Performing a silent installation for Bentley's Water products]] [[Validation or Certification documents for Hydraulics and Hydrology products]] Generating a log file for installation problem troubleshooting Waterobjects.NET How do I download the water and storm sewer products? How can I find out when a new version or patch is available? Cumulative patch set frequently asked questions Learning resource guides for new users PondPack V8i SewerGEMS V8i CivilStorm V8i WaterCAD and WaterGEMS HAMMER V8i SewerCAD_V8i StormCAD_V8i Bentley WaterCAD and WaterGEMS V8i Active Topology Management Importing A CAD Drawing In Bentley WaterGEMS Importing Demands From A Spreadsheet Understanding Automated Fire Flow Results Creating controls, conditions, actions and controls sets Adding Multiple Minor Losses To A Pipe Importing Time Series Data Using ModelBuilder Modeling Air Valves At High Points Building A Model Using Model Builder Updating A Model Using Model Builder Updating Source File Using Model Builder Using Darwin Calibrator Using Darwin Designer Using Darwin Scheduler Setting Up Pressure Dependent Demand Using Fit To Page Printing In The Standalone Platform Using The Network Navigator Running a Criticality Analysis Using Pipe Renewal Planner Running Pipe Break Analysis Scenario and Alternative Management General WaterGEMS V8 FAQ Opening old models in WaterCAD/GEMS V8 XM or V8i Submodel Importing and Exporting Pump Station and Pump Combination Curves ProjectWise Integration Setting Boolean (True/False) Fields using Model Builder Engine Compatibility Modes and Calculation Options Creating formula-based User Data Extensions Carbon Emission Analysis and Energy Cost Analysis Energy Cost Analysis WaterGEMS V8i SELECTseries 4 Flushing in WaterGEMS/CAD Select Series 4 Modeling top fill tanks and throttling inlet valves SCADAConnect SCADAConnect using Citect Server as data source Modeling a Connection to an Existing System Waterobjects.NET WaterGEMS V8 Modeling FAQ WaterGEMS For ArcGIS FAQ WaterGEMS V8 Automated Fire Flow FAQ What's new in WaterGEMS and WaterCAD V8i SELECTseries 2? What's new in WaterGEMS and WaterCAD V8i SELECTseries 3? What's new in WaterGEMS and WaterCAD V8i SELECTseries 4? What's new in WaterGEMS and WaterCAD V8i SELECTseries 5? What's new in WaterGEMS and WaterCAD V8i SELECTseries 6? Bentley HAMMER V8i Modeling a Pump Start-up Transient Event Modeling Reference - Hydropneumatic Tanks Modeling Reference - Air Valves Modeling Reference - Surge Valves Modeling Reference - Valves Of Various Types Modeling Reference - Valve With Linear Area Change Modeling Reference - Discharge To Atmosphere Modeling Reference - Check Valves Using Turbines in Bentley HAMMER Modeling existing valves as Throttle Control Valves in HAMMER Using Modulating PRVs Using Fit To Page Printing In The Standalone Platform Modeling An Initially Partially Closed Valve Scenario and Alternative Management Active Topology Management Creating formula-based User Data Extensions Importing a CAD Drawing Using Modelbuilder General HAMMER V8i FAQ Protective Equipment FAQ What's new in HAMMER V8i SELECTseries 2? What's new in HAMMER V8i SELECTseries 3? What's new in HAMMER V8i SELECTseries 4? What's new in HAMMER V8i SELECTseries 5? What's new in HAMMER V8i SELECTseries 6? Bentley SewerGEMS V8i Loadbuilder - Flow Monitoring Distribution Using Fit To Page Printing In The Standalone Platform Creating User-Defined Profile Settings Scenario and Alternative Management Active Topology Management Creating formula-based User Data Extensions Importing a CAD Drawing Using Modelbuilder Running a Long Term Continuous Simulation Waterobjects.NET General SewerGEMS For ArcGIS FAQ Modeling Reference - Headwalls General SewerGEMS FAQ [[Understanding the Modified Rational Method]] Why does a profile sometimes appear at odds with the Capacity? SewerCAD vs. SewerGEMS vs. SewerGEMS Sanitary What's New in SewerGEMS V8i SELECTseries 2? What's New in SewerGEMS V8i SELECTseries 3? What's New in SewerGEMS V8i SELECTseries 4? What's New in SewerGEMS V8i SELECTseries 5? How do you troubleshoot large SewerGEMS model? Bentley CivilStorm V8i Scenario and Alternative Management Active Topology Management Creating formula-based User Data Extensions Running a Long Term Continuous Simulation Importing a CAD Drawing Using Modelbuilder [[Understanding the Modified Rational Method]] Why does a profile sometimes appear at odds with the Capacity? T roubleshooting large CivilStorm models What's New in CivilStorm V8i SELECTseries 2? What's New in CivilStorm V8i SELECTseries 3? What's New in CivilStorm V8i SELECTseries 4? What's New in CivilStorm V8i SELECTseries 5? Bentley StormCAD V8i Creating User-Defined Profile Settings Using Fit To Page Printing In The Standalone Platform Transferring Custom Inlets Catalogs,Storm Data, Conduit Catalogs, or Flow-Headloss Curves from One Computer to Another Scenario and Alternative Management Active Topology Management Creating formula-based User Data Extensions Importing a CAD Drawing Using Modelbuilder Why does a profile sometimes appear at odds with the Capacity? General StormCAD FAQ What's new in StormCAD V8i SELECTseries 2? What's new in StormCAD V8i SELECTseries 3? What's new in StormCAD V8i SELECTseries 4 ? What's new in StormCAD V8i SELECTseries 5? Bentley SewerCAD V8 XM and V8i Modeling Force Mains With Air Valves Importing Loading Information Using Modelbuilder Loadbuilder - Flow Monitoring Distribution Creating User-Defined Profile Settings Using Fit To Page Printing In The Standalone Platform Scenario and Alternative Management Active Topology Management Creating formula-based User Data Extensions Why does a profile sometimes appear at odds with the Capacity? What's new in SewerCAD V8i SELECTseries 2? What's new in SewerCAD V8i SELECTseries 3? What's new in SewerCAD V8i SELECTseries 4? What's new in SewerCAD V8i SELECTseries 5? Importing a CAD Drawing Using Modelbuilder General SewerCAD FAQ SewerCAD vs. SewerGEMS vs. SewerGEMS Sanitary Bentley Pondpack V8i Scenario and Alternative Management Active Topology Management Using PondMaker What's New in Pondpack V8i? Entering Storage Chamber Information [[Understanding the Modified Rational Method]] Bentley WaterCAD and WaterGEMS V8 XM Importing A CAD Drawing In Bentley WaterGEMS Importing Demands From A Spreadsheet Understanding Automated Fire Flow Results Adding Multiple Minor Losses To A Pipe Using Fit To Page Printing In The Standalone Platform Scenario and Alternative Management Active Topology Management General WaterGEMS V8 FAQ General WaterGEMS V8 Modeling FAQ General WaterGEMS for ArcGIS FAQ WaterGEMS V8 Automated Fire Flow FAQ Bentley WaterCAD and WaterGEMS 3.0 Setting Up An Automated Fire Flow Analysis In WaterCAD 7.0 Or WaterGEMS 3.0 General WaterCAD 7.0 Or WaterGEMS 3.0 FAQ Bentley HAMMER V8 XM Modeling a Pump Start-up Transient Event Using Fit To Page Printing In The Standalone Platform General HAMMER V8 XM FAQ See Also WaterCAD product information WaterGEMS product information Product TechNotes and FAQs External Links Haestad Methods Water Solutions on Bentley Website Haestad Solutions eSeminars WaterCAD Trailer Video WaterGEMS Trailer Video WaterCAD User Guide WaterGEMS User Guide Advanced Water Distribution Modeling and Management online textbook Support page on Bentley website Bentley technical support KnowledgeBase
↧
Wiki Page: What's new in HAMMER V8i SELECTseries 6?
Applies To Product(s): Bentley HAMMER Version(s): 08.11.06.XX Environment: N/A Area: N/A Original Author: Mark Pachlhofer, Jesse Dringoli, Craig Calvin (Bentley Technical Support Group) Note: this is currently a work in progress. The final version of this article will be available shortly Overview The SELECTseries 6 release of HAMMER includes the following new features and improvements. List of Topics Updated Platform Support AutoCAD 2015, 2016 ArcGIS 10.3.X Controls (initial conditions) Performance improvement for large number of controls Easier creation of control sets when none exist Control set label presentation Easier managements of control sets, including display and filtering New "Find" function for easier control management Ability to import and export controls Tank Percent Full as a control condition Create control sets from selection FlexTables "Select in Drawing" for selected rows Create selection sets from selected rows Context Menu to quickly add or remove columns Open subset of rows through Right-click menu Freeze Column capability Sort arrow to indicate what is sorted and which direction Faster filter workflow with auto selection feature FlexTable text search Global Edit on selected cells Variable Speed Pumps (initial conditions) Overall improvement to VSP calculations including stability Improved headloss calculations in parallel VSPs Enhanced user notifications Improved handling for parallel VSPs when the lead pump is closed Choose between HGL and pressure for the Target Head Type New control action to modify "Pump Head (Target)" in VSP and VSPB Other Bentley Communities Search RSS Feeds Ability to control auto-open of Calculation Summary Easier export to Excel Flextables Several usability improvements have been added to Flextables: Freeze, Select, Add, Remove Columns The flextables have some very useful new features added. By right clicking on the grey column headers you will see the Freeze Column, Select Column, Add Column, and Remove Column options. Freeze Column – Will freeze that column and all columns to the left of it, so when you have a lot of columns in your flextable and need to scroll to the right you can freeze columns. For example, this is come be useful to keep a column like the label constantly visible for identification purposes as you access other columns. Select Column – Allows you to easily select all the records in that column, which is useful if you want to copy the data from that row to spreadsheet. Add Column and Remove Column – In previous versions in order to add or remove a columns, you’d need to click the edit button at the top of the flextable, but now you can easily select a property to add to your flextable through the add column option. When you move your mouse cursor over the add option a popup menu appears that breaks all the columns down by their category (general, physical, results, geometry, etc…). This makes finding properties much simpler than choosing from the entire alphabetized listed using the edit button in previous version. If you still prefer the using the edit button to add and remove your columns you will still have that option. Element selection by highlighting rows Another feature that adds great flexibility is the ability to select rows in the flextable by clicking on them. Rows are selected the same way you select them in an Excel spreadsheet. Once selected you can right click on the row header and choose “Open on Selection”. This will filter your flextable by the rows you’ve choose. This will allow you to perform tasks such as creating a selection set or adding to a selection set with more ease. It will also allow you to select the elements in the drawing that you have selected in the flextables. In previous versions both of these tasks would have to be done in the drawing pane or by using queries. The screen shots below show the process of filtering a flextable on row selection and show the menus for making selection sets and selecting elements in the drawing. While the flextable is filtered you now also have the option to right click and global edit on a column for only the features in that selection set. Sort arrow In the screen shot below you’ll see a small arrow has been added to columns that are sorted to indicated whether the sort is in ascending or descending order. Faster filter work workflow with auto selection When your right click on a column and choose to filter it using a query that column will now automatically be selected in the query builder to allow for faster queries to be created. In the screen shot below if you clicked on the diameter field outlined in blue and choose to filter by a query the diameter field in red would be automatically selected when the query builder opened. Find text in the flextable for faster feature location and selection Click the binoculars icon It will open this dialog that allow you to enter text to search the flextable based on Variable Speed Pumps (initial conditions) VSP handling and user notifications are now more robust and provide for easier troubleshooting. IMPORTANT NOTE: this applies to VSP results in the initial conditions (when computing a steady state or Extended period simulation) Overall improvements to VSP calculations Several improvements have been made in the pressure solver to provide for more stable VSP calculations. This allows you to run more complex models and VSP arrangements with easier troubleshooting. Improved headloss calculations for parallel VSPs For parallel VSPs with relatively small diameter pipes the headloss is more accurate in the suction and discharge pipes. The flow is now calculated inversely proportional to the number of pumps running at a particular time step. New user notifications a) If the suction or discharge pipes of fixed head parallel VSPs differ in diameter, length, roughness or minor loss coefficient, a user notification will be generated when validating or when calculating the model which says something similar to, "At least one discharge or suction pipe in a parallel VSP group has different pipe attributes (length, diameter, roughness or minor losses)." Headlosses for all pump pipework are based on the physical characteristics of the lead pump pipework. This is because of the parallel fixed head VSPs rules that dictates they need to use the same pump curve, control node, target head (pressure), etc... This user notification won’t be shown for parallel fixed flow VSPs because the flows for these can be different and therefore are calculated independently of each other using the unique upstream and downstream pipe attributes b) A user notification warning was added that says, "Pump cannot deliver the target head" if a VSP (or VSPB) can't reach the target HGL. Improved handling for parallel VSP functionality when a lead/lag pump is closed a) If one of the suction/discharge pipes of a parallel fixed head VSP lag pumps in the group is initially closed or closed by a control the other corresponding lag pumps will be turned on. b) The order of the lead pump loading has been changed for when the first loaded pump is initially off. In this case, the first initially opened parallel VSP is used as lead pump and the first loaded pump that was the lead pump is changed to a lag pump. d) Enhanced estimation of the flow used to calculate the pump speed factor for a single VSP pump with multiple upstream pipes. New Target Head Type pump attribute Added “Target Head Type” as a property with the attributes of 'Hydraulic Grade' or 'Pressure' to choose as the target to meet for target head (fixed head) VSP type. New pump control actions Pump pressure and HGL target has been added as a control action type. This allows you to easily change the target during the simulation. Other Bentley Communities Search A "Search" button has been added to dialogs. Once clicked, a new tab will open in your internet browser and search the Bentley Communities wiki database using the name of the tool or manager it was clicked from. Click here to go to a support solution that explains how to search for content. RSS Feeds in Standalone Once you have been on the Be Communities website and created an account, you can sign up for RSS Feeds. On the Be Communities website, log in, then scroll down to the bottom and you will see, under Social Media, RSS Feed. The RSS Feeds dialog can now be opened from the help toolbar and from the help menu. Once you have signed up for the RSS Feed and chosen the subjects for your feed, when in HAMMER, you can go to Help > RSS Feeds to see a list of the wikis and/or forums on your feed. Note: You must have a project open in order to do this. After you select RSS Feed a box will open with your feeds. You can do a search by typing a search term in the search bar, or you can do a filter by clicking on the filter button. If you click on the settings button in the upper right corner, a dialog box will pop up. Here you can select a product's feed. Auto-open of Calculation Summary The calculation summary will open after every run if the checkbox is checked and will not open if left unchecked. This will enable a more customized user experience. Export to Excel The model's data can now be exported to Excel. Steps: Go to, File > Export > Export to Excel. Then, in the Export to Excel dialog, specify properties and elements to be exported. Click OK. In the FlexTable Export dialog, select either Excel or CSV format and specify where it will be exported. Click OK See Also What's new in WaterGEMS and WaterCAD V8i SELECTseries 6? What's new in HAMMER V8i SELECTseries 5?
↧
Wiki Page: Runtime Error : Bad Record Number
Applies To Product(s): Bentley PondPack Version(s): 10.00.027.00 Environment: N/A Area: Original Author: Sushma Choure, Bentley Technical Support Group Problem: While computing the model this error appears. Background: The model might be computing without any issues, but when you add some more elements in the model, you come up with this error. Solution Option 1: There is limitation on size of the model for version 10 of PondPack. To proceed further you may need to split the model or try to deleting the not required elements to reduce the size of the model. Option 2: Other option is to upgrade to PondPack V8i, which is capable of handling the large size models. See Also http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/3055.whats-new-in-pondpack-v8i-faq
↧
Forum Post: RE: Zero Velocity Valve in Hammer
Mr. Jesse Dringoli In India, the term Zero Velocity Valve is well known and in demand in market to prevent hammer effect in piping system. Following is the description of valve which might help you to understand the term. Please let me know if similar kind of valve is avail in gems for analysis. Zero Velocity Valve consists of a Spring loaded closing disc for stopping reverse flow in case of failure of pumps. It is enclosed in an outer shell. A well designed dome is located in back of disc to stream line the flow in routine operation. Disc is mounted on a central shaft and is further supported by guide rods. Valve is provided with a bye pass arrangement. Valves are generally supplied with barrel ends but can also be flanged, if so desired. The springs are designed in such a manner that the valve remains full open when 25% of designed velocity is achieved. In case of closure of pump, disc starts closing in relation to decrease of velocity and fully closes when velocity drops near to zero. Thus upstream water column is prevented from creating water hammer wave. Bye pass arrangement keeps pressure balance on both sides of disc. It also prevents creation of vacuum in downstream side. Rushabh Sabadra TATA Consulting Engineers Limited Gandhinagar, Gujrat
↧
↧
Wiki Page: Performing Leakage Detection Using Darwin Calibrator
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Modeling Original Author: Sushma Choure, Bentley Technical Support Group Overview The purpose of this technote is to discuss how to use Darwin Calibrator to perform Leakage Detection. Background Leakage detection is the main criteria in the water loss management. You can perform leakage detection using tool Darwin Calibrator in Bentley WaterGEMS. Using Darwin Calibrator you can predict the location and size of the water loss. To know about format of the input data required for Leakage detection, please search by phrase – Importing Field Data into Darwin Calibrator Using Modelbuilder. Once you have detected the leakage nodes, you can use Criticality tool to repair the leaks. Or you can use Pressure Dependent Demands to minimize the leaks in the system. Note : Along with this technote you will find attached model used to explain Leakage Detection Using Darwin Calibrator & the input data files using Excel Format. Observing leakage over the time with the help of graph using the attached model for a particular element: For this example we have field data of flow through pipe P-13, which we will compare with the model results. (See attached model) Create graph for P-13. (Right click on P-13>Graph) Go to observed data tab>create new. You can directly copy/paste data from the spreadsheet/import .txt file or enter data manually. Once entered the observed data, the graph should look like this. The graph shows the actual flow for Pipe P-13 at various time steps & the observed flow on the field. With the help of this graph you can visualize the leakage at the determined locations, by using the actual flow in the model Vs. observed flow on the field. The difference between the actual flow and the observed flow is the leaked flow into the system. Calibrating the model to observe the leaks in the model Go to Analysis>Darwin Calibrator>Create new Calibration Study>Rename it as Leakage Study. Preparing data for importing the field data snapshots There are several ways of importing the field data into Darwin Calibrator. Using SCADA You need to have SCADA element present in the model for importing SCADA data. 2. Using other file formats as Microsoft Excel Oracle database Microsoft access database Example of data format required using Microsoft Excel. You can prepare data sheet for multiple hours of the day as seen below. Giving an Example of excel spreadsheet for flow through pipes & hydraulic grades at junctions; you can prepare same for other attributes of different elements. You need to import two sheets, one for observed data & second to relate the snapshot labels to the Calibrator & the name of of leakage study. Importing field data through Modelbuilder into Darwin Calibrator Go to Tools>Modelbuilder>New>Excel file. Choose this option as per your input data file. Import the attached excel file through Modelbuilder. Uncheck sheet P-13 , as it contains observed flow data which we already used for creating the graph for pipe P-13. Click next, change the coordinate units as per your model units. Click next until mapping table; map the filed data of hydraulic grades, flows , element labels, time , owner etc. as shown in the image below. Please select Filed data snapshot, observed target as table type for observed data & Field Data Snapshot for Snapshot Labels. Click next once done with the mapping of Modelbuilder, go to Calibrator to check the imported field data. It should look like this. Go to demand groups tab to create group of demands>create new>Select edit button from Element IDs column>select elements from drawing.You can create multiple demand groups as per different pressure zones/Material groups/Diameter groups in the model. ( Please see technote of Darwin Calibrator to know how to create demand groups) Setting up calibrator study for leakage detection Create new optimized run>Rename it as Leakage Detection. In the Demand tab, select Detect Leakage Node in the operation column. Set the minimum Emitter coefficient - 0, maximum-0.5 & increment of 0.01, number of leakage nodes -5, as seen in the screenshot below. You can change the emitter coefficient values as per the amount of leakage. Go to field data tab, here you can select time steps you want to calibrate, we will select 0 hr for this run. Also you can run the calibration with different combinations of time steps, or all time steps in one go. Compute the Darwin Calibrator once all set. You can increase the number of solutions by going to options>Optimized run. Click on the solution 1 in the left side of the window, you can see the number of leakage nodes detected in the right side of the window. To see which nodes are affected please see the Last column – Adjusted Emitter Coefficient in the Adjustment Groups. Sort the column descending by right clicking on it, to see the affected nodes. Here you can see that junctions J-4 & J-14 are detected as leak nodes having adjusted emitter coefficients of 0.07 & 0.04 , rest all junctions are free from leakage. Now export the results in the form of scenario to visualize in the model. While exporting the results only select Export Emitter coefficients. Viewing the results using Element Symbology Make newly exported scenario as active> Analysis>scenario>Compute the active scenario - New Optimizes Run . Go to Element Symbology>Junction>New color coding. Select Emitter Coefficient as the field name>color & size the elements. You can visualize the leakage elements in the model. See Also http://www.bentley.com/en-us/Solutions/Water%20and%20Wastewater/Water%20Loss/ http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/5910.using-darwin-calibrator http://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/running-a-criticality-analysis (Please visit the site to view this file)
↧
Wiki Page: I have a section of pipe that is made of two materials. Can I just average the pipe roughness to come up with a composite roughness?
Applies To Product(s): Bentley WaterGEMS,Bentley SewerGEMS, Bentley CivilStorm, Bentley StormCAD, Bentley PondPack, Bentley StormCAD, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.04.58 Environment: N/A Area: Modeling Subarea: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Description I have a section of pipe that is made of two materials. Can I just average the pipe roughness to come up with a composite roughness? Solutions It may or may not be ok to combine the pipe roughness values to go with an average, but it certainly seems like there could be a case in which a good argument could be made for it. The best way to figure out what will work best for you is to try one and compare the results to your field data. Here are some ideas you can try that might help you out: 1) If you know where the pipe materials differ then try to add multiple pipes and use different roughnesses. For example if you know the first 1500 ft. of the pipe is shotcrete lined followed by 1500 ft. of partially rough cut D&B followed by another 1500 ft. of shotcrete lining then you might want to try making it 3 separate pipes each with their respective roughness values. If it is not that simple consider options 2 and 3 below. 2) Use the roughness value that is the most conservative. This will assure that you design your system to handle the worst case scenario. 3) Try to model it a few different ways by taking advantage of creating some child scenarios and then compare the results to see the differences, if any. It would be a great use of the scenarios and probably wouldn't take that long.
↧
Wiki Page: How can I model a manhole structure where the shaft is larger than the storage chamber?
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 How can I model a manhole structure where the shaft is larger than the storage chamber? For example, the shaft have 1.2m in diameter and storage chamber is 2m X 2m in width. Solution *The solution below uses CivilStorm as an example, but can be applied to the other products listed above. CivilStorm can model the storage capacity of a manhole, but it will be based on the size that you enter, so if you enter a diameter of 1.2 mm circular the storage will be based on that. Most people just accept this and use this as the storage because you'll find the storage effects are going be negligible on the hydraulics. If you do want to try to account for the storage effects you could set up your model like I have shown in the screen shot below: Instead of using a manhole to model the manhole you'll use a pond with either an elevation area curve or one of the other pond volume definition types to model the shaft and then the storage chamber. Using this setup will probably cause more instability in your model and will likely only have negligible effects on the storage, so it might not be worth doing, but that is ultimately up to the engineer to decide. If you wanted study how this setup impacted your model you could try to create one scenario with regularly defined manholes and then create another using the pond setup idea. After running both you would compare the results of the two scenarios. This is called a sensitivity analysis and it will show just how much the model will change and what other factors, such as the Continuity Error (a measure of model stability and results accuracy), will be effected by the changes. After you run the analysis described above you might want to use the Hydraulic Reviewer (Tools > Hydraulic Reviewer) to see what changes in storage and other factors are being impacted between the two setups.
↧
Wiki Page: Can I model fluids other than Water?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Can I model fluids other than Water? Solution Yes, you can. You can define new liquids under Components > Engineering Libraries > Liquid library, by way of the specific gravity and kinematic viscosity. You can then select your custom liquid in your calculation options (Analysis > Calculation Options). Note that only Newtonian liquids are valid, and you might need to adjust your pump definitions if the viscosity of your fluid differs from water. Furthermore, as Hazen-Williams friction method is an empirically based formula, its calculated friction losses are only applicable to Water @ 20 deg C. It should not be used for other liquid types (and you should use Darcy-Weisbach instead).
↧
↧
Wiki Page: How can I add a new material such as HDPE to the material library?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How can I add a new material such as HDPE to the material library? Solution Go to Components > Engineering Libraries and click the plus sign next to "Material Libraries" Right click MaterialLibrary.xml and choose "add item" - a new material entry will appear at the bottom of the list. Right click this new material entry, choose rename and enter the name (such as 'HDPE'). On the right side, enter the friction coefficients for your new material, then click close. If you would like to create a new engineering library (xml file) instead of altering the default MaterialLibrary.xml, simply right click on "Material Libraries", choose "create library", choose a location to save the file, then repeat steps 2-4 above, replacing 'MaterialLibrary.xml' with the name of your library.
↧
Wiki Page: How can I model a steady state simulation with demands from a specific time of the day?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How can I model a steady state simulation with demands from a specific time of the day? Solution If your steady state simulation represents a certain time of the day and you'd like the appropriate demands to be used, based on your demand patterns, you can use the EPS snapshot feature. Go to Analysis > Calculation options. Double click your calculation option set and choose "True" for "Is EPS Snapshot?". Then, select your date/time. When you compute the steady state simulation, it will use demands based on the multiplier on your demand patterns. Note that if your pattern timestep (increment of the time column) is less than 1hr, the computed demand will be "smoothed" based on the average of the multiplier from that timestep and the next.
↧
Wiki Page: Should I use the inside diameter or outside diameter for the "diameter" field for my pipes?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem Should I use the inside diameter or outside diameter for the "diameter" field for my pipes? Solution WaterCAD and WaterGEMS use the inside diameter (ID) for calculations. So, you should enter the inside diameter for each pipe's "diameter" field. Nominal Diameter for most common material types is close enough to Internal Diameter to be used directly for modelling. However, you should be careful for some materials, as the manufacturer's expressed "nominal diameter" may refer to the outside diameter, which could be substantially different from the inside diameter. Discrepancies in model calibration are usually related to errors in roughness coefficients, not diameters. See Also
↧
Wiki Page: How can I find the total volume of water through a certain element?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How can I find the total volume of water through a certain element? Solution Right click on the element and choose "totalizing flow meter". In this tool, you can select the timeframe and report water volume.
↧
↧
Wiki Page: How can I model a backflow preventer?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How can I model a backflow preventer? Solution You can do this with a General Purpose Valve (GPV) and a check valve. In the valve properties, enter a table of flow versus headloss. Make sure the orientation of the adjacent pipe is correct and then choose "True" for "has check valve?". If a certain amount of head is required to push open a closed check valve, it may be desirable to include some special entries in the GPV curve: 0,0 and 0.001,X, with ‘X' being the head value above which the valve can reopen.
↧
Wiki Page: How does the Pressure Sustaining valve (PSV) work?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How does the Pressure Sustaining valve (PSV) work? Solution A pressure sustaining valve (PSV) tries to maintain the upstream pressure or hydraulic grade at a user-defined pre-set value. In order to achieve its pressure sustaining ability, a specific headloss will be induced through the PSV, such that energy balance across the model results in the upstream pressure obeying the setting. The valve can be in one of three states: - Partially opened (i.e., active/throttling) to maintain its pressure setting on its upstream side when the downstream pressure is below this value. - Fully open (inactive) if upstream pressure exceeds setting or if the downstream pressure is above the setting. - closed if upstream pressure falls below setting or if downstream pressure exceeds upstream pressure. Example: PSV setting is 55psi Upstream pressure = 50 then valve closes Upstream Pressure = 55 and downstream pressure = 60 then valve closes Upstream pressure = 65 then valve opens Upstream pressure = 55 and downstream pressure = 45 than valve controls A pressure sustaining valve (PSV) tries to maintain the upstream pressure or hydraulic grade at a user-defined pre-set value. In order to achieve its pressure sustaining ability, a specific headloss will be induced through the PSV, such that energy balance across the model results in the upstream pressure obeying the setting. The valve can be in one of three states: - Partially opened (i.e., active/throttling) to maintain its pressure setting on its upstream side when the downstream pressure is below this value. - Fully open (inactive) if upstream pressure exceeds setting or if the downstream pressure is above the setting. - closed if upstream pressure falls below setting or if downstream pressure exceeds upstream pressure. Example: PSV setting is 55psi Upstream pressure = 50 then valve closes Upstream Pressure = 55 and downstream pressure = 60 then valve closes Upstream pressure = 65 then valve opens Upstream pressure = 55 and downstream pressure = 45 than valve controls
↧
Wiki Page: How does the Pressure Reducing valve (PRV) work?
Applies To Product(s): Bentley WaterGEMS, Bentley HAMMER, Bentley WaterCAD Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Mark Pachlhofer, Bentley Technical Support Group Problem How does the Pressure Reducing valve (PRV) work? Solution A pressure reducing valve (PRV) will throttle the flow to prevent the downstream pressure or hydraulic grade from exceeding a user-defined pre-set value. In order to achieve its pressure reducing ability, a specific headloss will be induced through the PRV, such that the resulting downstream pressure obeys the setting. The valve can be in one of three states: Valve is CLOSED if downstream pressure exceeds the pressure setting or is greater than the upstream pressure (to prevent reverse flow). Valve is OPEN if upstream pressure is less than setting and downstream pressure is less than upsteam pressure. Valve CONTROLS if upstream pressure is greater than setting and downstream pressure equals setting. Example: PRV setting is 55psi Downstream pressure = 65 then valve closes Upstream Pressure = 45 and downstream pressure = 50 then valve closes Upstream pressure = 45 and downstream pressure = 40 then valve opens Upstream pressure = 70 and downstream pressure = 55 than valve controls
↧