Hello Rossouw, I spoke with the developers about this. This is working as designed. There are many different possible combinations that the export could work. The current way you are seeing it is the current way the export is handled. When there are one or more fixed pattern loads for a node, the export will pass the loading as to the Dry Weather tab in SWMM V5 as a baseline flow. However, if there are multiple loads were one follows an hourly pattern and the other is fixed, it will import everything to the Direct tab in the manner you are seeing. This method is the most straightforward method to export the data while avoiding possible issues in the conversion. Please let me know if you have any additional questions. Regards, Scott
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Forum Post: RE: SewerGEMS export to SWMM
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Forum Post: RE: while publishing I model the error displayed saying object reference not set to an instance of an object what is the logic of this error & how it can be resolved?
Hello Ajaykumar, Could you let us know what version of SewerCAD and CivilStorm you have? You can find this by going to Help > About (product name). The version number is in the lower left in brackets. In addition, let us know if this occurs for any other models, or if it is specific to this one. In addition, if the model as a background layer, trying removing it to see if that makes a difference. Regards, Scott
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Forum Post: RE: TRex Wizards data source file problem
Hello Rohit, DXF Point and DXF Contour files can be used. You should make sure to choose the appropriate source file type for the file you have. For instance, if it is a DXF Contour file, make sure to select the DXF Contour source file type. If that doesn't help, try loading the DXF file as a background layer. You can do this by choosing View > Background Layers. Choose "New File" and select the DXF file. You may need to do a Zoom Extents to see the background. The purpose of this is to make sure that the coordinates of the model matches that of the DXF file. If the DXF file doesn't overlay the model, TRex will not be able to import the elevation data. If this doesn't help either, we will need a copy of the model files, as well as the elevation data file. 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. communities.bentley.com/.../7079.be-communities-secure-file-upload If you upload the file to Sharefile, please post here with the name of the file so that we know it is available. Regards, Scott
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Forum Post: RE: StormCAD V8i
Hello Rohit, For the first item, the most important thing to keep in mind is that StormCAD uses the Rational Method (Q=CIA) when solving a system. SewerGEMS models hydrographs (flow vs. time) while StormCAD is more of a snapshot. For that reason, it is expected that flow results in StormCAD will be different from that in SewerGEMS. I would encourage you to look at some of the SewerGEMS help topics on the different solvers, which will help explain some of the key differences and how the solvers can differ. The topics "Switching Between Solvers in Bentley Storm and Sanitary Sewer Models" and "Solvers (Numerical)" will be especially helpful. For the second item, the values you use should be reflective of what is in your system. If it is, your results should be accurate. In the properties for a given element, if you highlight the property field, you will see a brief description of what that item is and the sort of input expected. Regards, Scott
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Forum Post: RE: StormCAD input data
Hello Rohit, 1. I assume you mean that this is a box conduit. The design is largely an automated process. You will need to set the conduit to be a catalog conduit. There is a conduit catalog found in the Components pulldown menu (Components > Conduit Catalog). Here would would include all of the possible conduit sizes that the program will consider. You can import these from the engineering libraries or create them yourself. Once you have these, open the conduit properties and make sure that the property "Conduit Type" is set to Catalog Conduit and assign a size to the conduit. If needed, you can globally edit items in in the flextables. When you compute the Design run, the program should use the available conduit sizes in your conduit catalog to aid in designing your system. I would suggest reviewing the Quick Start Lesson related to automated design as well. This will be useful to get the general steps for using automated design. You can find the Quick Start Lesson by going to the Help pulldown menu and choosing Quick Start Lessons. One of the lessons will be on automated design. 2. If you have a shapefile or DXF file with the catchment data, that would be the best option, as you would be able to have a better representation of the actual system. You can use ModelBuilder to import the data. If you don't have a file with the actual catchment data, you could use the Thiessen polygons you created and saved as a shapefile and import these through ModelBuilder. Go to Tools > ModelBuilder and create a new connection. Set the Source File Type to "ESRI Shapefiles" and browse to the shapefile location. You can then follow the ModelBuilder process to create the shapefiles. For more information on ModelBuilder and the steps involved, I would suggest reviewing the Help documentation on ModelBuilder. Once completed, you would have the catchments. You will need to assign the correct areas and other relevant data. If you already have the inflow data for the catchments, it might be earlier to just include this as a fixed inflow at the catch basins. You can add this to individual catch basins as "Flow (Additional Subsurface)," which is for flow coming into the system below the ground, or "Flow (Additional Carryover)," which could be captured at the catch basin or bypassed through gutter. The ideal option would be the first one, using actual data for the existing system. Regards, Scott
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Wiki Page: Transient pressure wave not dampening or unexpected lack of headloss
Applies To Product(s): Bentley HAMMER Version(s): 08.11.xx.xx Environment: N/A Area: Calculations Subarea: Original Author: Scott Kampa, Jesse Dringoli, Bentley Technical Support Group Problem Description Symptom A - waves not dampening No matter how long I run the transient simulation in HAMMER, the surge waves (such as the pressure or HGL over time) never dampen or settle down to a final steady state condition. For example the pressure oscillated back and forth forever. Sympmtom B - unexpected lack of headloss across a pipe or Orifice-Between-Pipes When viewing a profile across a pipe or across a Orifice Between Pipes node element, no headloss is observed. Solution For pipes that start with a positive flow and end with zero flow If you have flow in the pipe in question during the initial conditions, but then close it off during the transient simulation (such as from a valve closure), most likely you are not seeing the surge waves dampen (reach a final steady state) or are seeing a lack of headloss, due to the lack of flow. Without flow, there is no headloss, and no dampening of surge waves, so the hydraulic grade will oscillate back and forth without settling down. If the pipe is connected to a reservoir or tank, you can have a small amount of water movement that can slightly dampening the waves. Also if you have a small demand anywhere and the pressure is positive at that location, the outflow can induce a flow that can dampen the pressure wave. You can try adjusting the Transient Friction Method in the transient calculation options as mentioned in the below article, but that may not necessarily help. You might consider simply accepting this behavior. For example if you need to design the system based on the max or min pressure, you may already have the information you need to proceed. "Unsteady" vs. "Unsteady - Vitkovsky" transient friction methods in HAMMER You can also observe this in the "sample1.wtg" file that ships with HAMMER, located in the "Samples" subfolder - the pipe in this model has no headloss, so attenuation doesn't occur. If you reduce the stop HGL of that pipe and re-run, the wave will be attenuated due to friction. For pipes that start with zero initial flow This situation can sometimes occur in pipes that have zero flow in the initial conditions. The likely cause of this is the value calculated for the pipe's Darcy-Weisbach friction factor, f. If the friction factor is zero, you'll have no headloss, and thus nothing to dampening the pressure wave over time. The HAMMER transient solver uses the Darcy-Weisbach friction factor, f, for the frictional losses in a model. In pipes with non-zero initial flow, the Darcy Weisbach coefficient is calculated based on the headloss across the pipe. In pipes that have zero flow in the initial conditions (which may occur for many pipes when simulating a pump startup event), the Darcy Weisbach coefficient will be computed based on the entered Hazen-Williams, Darcy-Weisbach, or Manning's coefficient, using the the Von Karman equation to calculate the Darcy-Weisbach friction factor, based on the Roughness height and diameter: DW f = (1.0 / (2.0 * Log10(Diameter / roughness height) + 1.14)^2 However, calculation 'noise' can sometimes occur in the initial conditions, causing the flow in a pipe to be near-zero instead of exactly zero. In your transient calculation options, you will see the tolerance that HAMMER uses to determine pipes that have zero flow, to account for this situation. In some cases, you may need to either make the "accuracy" value smaller in your steady state calculation options, or increase the flow tolerance value in the transient calculation options. Similar to a valve discharge coefficient, if the flows are near zero but above the flow tolerance, the coefficient that HAMMER computes to use for that pipe may be unreasonable (since it's based on a tiny headloss), especially when higher flows occur when the pumps are on. This situation can happen even if your pipe has a 'real', non-zero flow that is relatively small. To check HAMMER's computed friction coefficients, open the "Output log" under Report > Transient Analysis Reports, and scroll down to the section titled "Pipe Information". The flow tolerance determines if a pipe is considered as having zero flow or not. The best value to use for the Flow Tolerance field in the transient calculation options depends on the modeling situation. If you have pipes whose flow is zero in the initial conditions (such as near a pump that is off or a closed valve), you will need to make sure the flow tolerance is higher than the flow seen in those pipes. There's always going to be a little bit of calculation noise, so pipes whose flows should be zero might be something like 0.0004567. So, be sure to change the decimal precision on both the flow tolerance field and the computed flow field and compare the two. If all of the pipes in your model have positive flows, you don't need to worry about what to set the flow tolerance to. Please note, if you have zero flow in conduits, there is no friction and no headloss, and the minor loss coefficient is ignored. When the flow in a pipe in the initial conditions is less than the tolerance, it will be considered as having exactly zero flow during the transient simulation, which changes the method by which HAMMER computes the Darcy-Weisbahc friction factor to use for those pipes. The flow tolerance should be small enough so that pipes with positive flow aren't considered as having zero flow, but large enough so that pipes that do have zero flow are considered as such. So, if you have a pipe that basically has zero flow in the initial conditions, yet some numerical noise causes it to be slightly above the tolerance, the friction factor will not be accurate. If the Darcy-Weisbach friction factor is calculated as zero, this will basically mean that the pipe is frictionless and you will see oscillating flow in the system with dampening. In such cases, you may need to review the Steady State/EPS solver Accuracy value and the Transient solver Flow Tolerance setting so that the friction factor is correctly calculated. This situation can also happen with the Orifice Between Pipes element; if the flow through it is less than the tolerance, it will use the entered nominal head and flow value to calculate headloss, but if the flow is higher than the tolerance, it will try to use that flow along with the head drop to calculate the coefficient used to calculate change in headloss during the transient simulation. So, if the flow through it is higher than the tolerance but yields a headloss of zero, it will use a zero discharge coefficient and thus you'll see zero headloss.
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Forum Post: RE: Transients in downstream Surge Tank and TRT for a Hydropower scheme
First, it looks like you're using an old version of HAMMER - 08.11.02.31 (SELECTseries 2). The latest version is 08.11.06.113 (SELECTseries 6). I'd recommend upgrading if possible, as we've had numerous improvements over the years. You can read more about what's new in each release in the below link (scroll to the HAMMER section and look at the articles starting with "What's new in...") SELECTsupport TechNotes And FAQs Second, you could benefit from using Scenarios and Alternatives so that you have one single model file instead of one for each of the situations or configurations you are assessing. You could use the Active Topology alternative to model the different surge tank orifice configurations (orifice between pipes vs. pipe headloss) and the Transient alternative to model the different turbine operating cases. Check out this blog post from our Hydraulics and Hydrology Video series for more: Better Model Management with Active Topology With that said, the main issue in question is with the headloss in the pipes adjacent to your surge tank. From looking at the model, the issue is related to the near-zero flow in the initial conditions. For a transient simulation, HAMMER always uses a Darcy Weisbach friction factor calculated based on the pipe's initial conditions headloss. If that headloss is considered zero, it's calculated based on the friction coefficient. The problem in the case of your load rejection models is that the flow is slightly higher than the "flow tolerance" calculation option but has zero headloss, resulting in a zero friction factor for the pipes and zero discharge coefficient for the Orifice Between Pipes node. In the load acceptance, you'll see that the initial flow is slightly higher, enough to cause a small headloss in the pipes and orifice (add some decimal places to see). See below article which explains more: Transient pressure wave not dampening or unexpected lack of headloss The zero friction factor is seen under Reports > Transient Analysis Reports > Transient Analysis Output Log > search for the section called "Pipe information". The pipes adjacent to the surge tank are found at the bottom of the list. If you fix this issue, you'll see headloss in the transient simulation. Since these pipes are very large, a suitable solution may be to simply increase the flow tolerance so that it is higher than the flow in the pipes in question (the ones resulting in zero headloss). For example in the "rejection with orifice" model, try a tolerance of 1.0 l/s (the initial flows are about 0.3 l/s). From this, I was able to see headloss during the transient simulation.
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Wiki Page: Catchment polygon visualization after importing from non-spatial data source
Applies To Product(s): Bentley StormCAD, SewerCAD, SewerGEMS, CivilStorm, PondPack Version(s): 08.11.XX.XX Environment: N/A Area: Original Author: Jesse Dringoli, Bentley Technical Support Group Problem When importing catchments from a data source that does not include the geometry (shape/vertices), each catchment appears as a green pentagon shape. What can be done to better visualize the catchments in the drawing? Or... how can I import and assign catchment areas for a large number of catchbasins? Solution Catchments (or any other polygon element type) that are imported from a data source type that does not include geometry, will import as the default pentagon shape. There is no way to scale up or down the catchment shapes in the Standalone version, but you can manually change the shape by manipulating the vertices or using right click >add/remove bend. Some other options to consider: 1) Uncheck the catchment layer in element symbology to make them disappear from view (they will still be included in the calculations but won't clutter up your plan view) 2) import catchments from a data source type that does include the geometry such as from a GIS source (ex: shapefiles). 3) (StormCAD) Using Modelbuilder, import the contributing areas directly into the catchbasins instead of importing catchments. (External CA and External Tc fields) Enhancement #186866 has been filed for the ability to split catchments, though this is something you may be able to do in another platform such as SewerGEMS for ArcGIS. See Also Original Question: Catchment Polygon Size by Mohd Azzam Is there any automatic method for input Tc or assign the outflow element to the catchment area to save time?
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Wiki Page: Simulating a Fire Response in SCADAConnect Simulator
Applies To Product(s): Bentley WaterGEMS, Bentley WaterCAD Version(s): 08.11.06.58 Environment: N/A Area: Layout and Data Input Original Author: Sushma Choure, Bentley Technical Support Group OverView This technote explains about new option of Simulating a Fire Response in SCADAConnect Simulator , introduced in the SELECTSeries 6 of WaterGEMS. There is a separate technote for Understanding Automated fire flow results. Simulating a Fire Response in SCADAConnect Simulator With the release of WaterGEMS V8i SELECTseries 6, the SCADAConnect Simulator tool has a new option: Fire response. Fire Response enables you to place a fire demand (or other emergency flows) at a node for a period of time to determine its impact on pressure and flows and possibly test alternative ways of responding to the fire. This is done in the SCADAConnect Simulator environment, which is user-friendly and thus can be used by operators who are not familiar with hydraulic modeling. The fire response can be found at the Home tab or the Emergency Response tab in SCADAConnect Simulator (Tools > SCADAConnect Simulator). This is to be used for simulating the operational consequences for a fire. For system-wide fire flow capacity analysis, you should use Automated Fire Flow Analysis. When you click Fire Response, a dialog appears. You then need to pick the node where the fire flow is placed and complete the fire flow demand, start date/time and duration of fire demand In some cases, fire fighters will use a large flow to control a fire for a few hours and then a lower flow to finally extinguish the fire. This would correspond to two entries in the Active fire flow dialog. An example of that setup is shown below. To simulate the Fire Response, first make sure that you have “Fire Responses” active (check box checked) in the window above, along with the desired individual Fires. Ensure that the correct Baseline Scenario is selected. You can directly compute the scenario from the SCADAConnect Simulator tool, or use the standard Compute button in the main WaterGEMS interface. Results can be seen by way of color coding and annotations in the drawing pane. You can pre-configure this along with saved Graphs and Named Views, and an Operator can access them from the Home tab of SCADAConnect Simulator. The image below shows the symbol for a fire placed on a hydrant element. See Also What's new in WaterGEMS and WaterCAD SELECTseries6? How does Automated fire flow analysis work? Understanding Automated Fire Flow Results
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Forum Post: RE: while publishing I model the error displayed saying object reference not set to an instance of an object what is the logic of this error & how it can be resolved?
Also, check if you have any Tap or Lateral elements in the model. If you find that the problem is model specific and you're not able to upgrade (the latest version is 08.11.05.113), please send a copy of the model for review. There are two options for sharing your model on Communities. Either way, be sure to zip your files first. The first option is to attach to your reply on the forum using the Advanced Reply Editor (see link below and to the right of the reply box). If your data is confidential, use the instructions in the link below to send it via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley. communities.bentley.com/.../7079.be-communities-secure-file-upload
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Forum Post: RE: TRex Wizards data source file problem
Also check this other recent post: communities.bentley.com/.../356016 You may need to check the DXF file in another program such as MicroStation or AutoCAD to see if it does indeed contain points.
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Wiki Page: Performing clash detection of storm/sewer/water models using Bentley Products.
Applies To Product(s): Bentley SewerCAD, Bentley SewerGEMS, Bentley WaterCAD, Bentley WaterGEMS, Bentley CivilStorm Version(s): 08.11.XX.XX Environment: N\A Area: Modeling Subarea: N\A Original Author: Sushma Choure, Bentley Technical Support Group Problem: Is it possible to perform clash detection (otherwise known as Conflict Resolution) between storm, sewer and water utilities using Bentley Hydraulics and Hydrology (Haestad) Products? Solution: To perform clash detection between the storm/sewer/water models you need to have Bentley Navigator or Subsurface Utility Engineering (SUE) & Subsurface Utility Design & Analysis (SUDA). It’s not possible to do this using a Hydraulics and Hydrology (Haestad) product on it's own. Navigator is used to perform the clash detection but you cannot edit the models there. Whereas SUE can perform the clash detection as well as you can make the changes in model there itself. It provides 3D modeling of underground utilities of all sorts, including storm and sanitary systems. Using SUDA you can have hydraulic capabilities to the functionalities provided in SUE. SUDA leverages the power of hydraulic design/analysis capability in SewerCAD, CivilStorm, SewerCAD, and SewerGEMS wrapped up in a single package and runs in the OpenRoads environment. While the capabilities of all 4 storm water products are included in the same package, the functions available to any specific user depends on which licenses you have active. Below are the options available to perform clash detection. Option 1: Using Bentley Navigator for clash detection: Export the i-models of E.g. storm & sewer models from StormCAD/SewerCAD/SewerGEMS. Import i-model into Bentley Navigator, perform the clash detection. Please note that i-models are not editable, so you can’t make changes in Navigator. Make the changes in models separately as observed in the clashes. Here is the support solution which explains how to perform clash detection in Bentley Navigator. http://communities.bentley.com/products/projectwise/project_review/w/wiki/8823.clash-detection-in-bentley-navigator Option 2 : Using Bentley Subsurface Utility Engineering for clash detection & editing. Export the shapefiles using Bentley SewerCAD/StormCAD/CivilStorm/SewerGEMS/WaterCAD/WaterGEMS for each element separately using Flex table. 2. Import the models (shapefile) into SUE, using Modelbuilder. 3. Run the clash detection tool. 4. Adjust the element positions and elevations in SUE, if clashes are there. 5. Then use the Modelbuilder to sync out the data. 6. Build the model again in Haestad products using Modelbuilder. Here is the support solution which explains how to perform clash detection using SUE: http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/17691.video-clash-detection Option 3: Subsurface Utility Design and Analysis (SUDA) will have conflict detection capabilities of SUE with the hydraulic design capabilities of SUDA. You will be able to check for conflicts between any modeled underground utilities, drainage and sanitary networks, and even 3D road and bridge design artifacts to help guide your design. Thus, in a more manual process you would design and model your road/site, existing utilities, proposed utilities, and proposed drainage, then check for conflicts on all the above to guide your decision making process for the remainder of the design. The procedure for conflict detection is same as mentioned for SUE. The workflow would be: Model the network in SUE using the SewerGEMS/CivilStorm/StormCAD solvers. Also you can model other underground utilities. Perform the clash detection same as mentioned in option 2. If you find any conflicts/clashes in the model adjust them>rerun the model using Storm-Sewer solver to check whether it follows design constraints or not >Then again perform clash detection to check for conflicts if any. At some time in future we may consider automating the clash detection along with the design engine, which will avoid this batch process. Also See Subsurface Utility Engineering (SUE) video clips, technotes, and FAQs Subsurface Utility Engineering Software Product Information Page OpenRoads Technology Product Information Page
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Forum Post: RE: How to analyse clash detection between pipes.
Hi Ajaykumar, There are three different programs that we have, which can perform a Clash detection. One of the programs is called Subsurface Utilities Engineering (SUE), the other is called Subsurface Utilities Engineering and Analysis (SUDA), and the last one is called Bentley Navigator. All three can do a clash detection analysis for the storm sewer products that you mentioned (StormCAD and SewerCAD), but the only one that can perform a clash detection for WaterCAD is Bentley Navigator. As the wiki article points out though, you can't edit your model in Bentley Navigator. You should probably speak with you Bentley Account Manager if you're interested in purchasing any of these products. If you're not sure who that is and you can provide me with the name of the company that you work for we will do our best to find out for you or put you in touch with someone who can help you make the best decision on the product that will suit all your needs best. The exact steps on how to perform the analysis are found in the wiki link below. communities.bentley.com/.../18786.performing-clash-detection-of-stormsewerwater-models-using-bentley-products Regards, Mark
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Forum Post: RE: StormCAD V8i
Re: #2 - If you're asking if there's a way to enter data for multiple elements at once, then there are a few things worth mentioning. First, if you have data in an external file, you can import it using Modelbuilder. Here are a few resources on Modelbuilder beyond the Help topic: Importing a CAD Drawing Using Modelbuilder Building A Model Using Model Builder It's also worth mentioning catalogs, seed files, prototypes and global editing. Catalog such as the Conduit Catalog (Components Menu) allow you to import company standard items (such as pipe sizes/shapes/materials for the conduit catalog) from an engineering library. This makes it easier to set up some reusable items. You can set up these things (and more) ahead of time and save to a Seed file (File > Seed), allowing you to start future models with all the standard already loaded. With catalogs configured with your standards, you can set up element prototypes (View > Prototypes) to pre-configure newly laid out element properties. For example you can set up a conduit protype which sets the type to catalog conduit, sets the conduit class to one from your standard conduit catalog, sets the shape and initial size. That minimizes what you need to change after inserting or importing model elements. We'll be posting a video on this subject to the Hydraulics and Hydrology Blog within the next month, as part of our new Hydraulics and Hydrology Video Series . You can also perform global edits in flextables to bulk-edit properties. For example if you want to set the Rational C of a large collection of catchments to the same value, you can do that. In a flextable. For more details, see How can I globally edit certain elements in a FlexTable such as from a selection set?
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Forum Post: RE: Transients in downstream Surge Tank and TRT for a Hydropower scheme
Thanks for providing the solution. It worked. Regarding the upgrade, do I have to do it online and what is the cost associated with it?
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Forum Post: RE: StormCAD V8i
Thank you sir
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Forum Post: RE: StormCAD V8i
Thank you very much sir
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Forum Post: RE: StormCAD input data
Thank you sir
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Forum Post: Rational IDF Curve
Hello Sir, I am working with StormCAD. 1. I have insert Storm Data in User Defined IDF Table. Table include Return period in year and minute for rainfall in mm/hr. I wish to calculate my design then how can i utilised this data for calcuation purpose. and any post have detail example wise explanation about different method for Storm Data. 2. I have select conduit shape are circle and Box. after design i wish to show the size of drain in conduit. i have try to add by annotation but i cant see it propoerly. can you please provide me some solution. Thanking you Rohit Vaghasiya
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Forum Post: Rainfall Intensity
Hello Sir, I am working with StormCAD I have insert storm data using IDF curve table. At catch basin flow come from catchment area. my question is that it is required to provied that per hectare rainfall intensity? because from IDF curve it is clear that mm/hr intensity. while point come to catchment is it required to specify that mm/ha intensity?? Thanking you Rohit Vaghasiya
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