I had a surveyor do a 3D scan of a production area I am modelling in Sewergems V8i select series 1
I would like to use the 3D scan to update catchment areas and incorporate the temporary storage allowed for in the catch basins and bunt wall areas of the plant in the model...
The model I am building represents and Oily Water Sewer network containing oily water runoff from said production areas.
I know there is a an Area-depth function or the like I can use but am unsure how to bring in information from my 3D survey
Thanks in Advance
If you are just looking to add data to your model you will likely have to add it manually because there is not a tool to bring in informational automatically from a 3D scan, like modelbuilder or T-Rex would do with a shapefile, dxf, excel file, etc... At best you may be able to use the scan as a background layer if you are using SewerGEMS for AutoCAD or SewerGEMs for ArcGIS and you may even be able to add the file as a background in standalone too. Adding the file as a background in standalone would depend on what kind of file it is (.jpg, .tiff. png, shapefile, dxf, dgn etc...). What type of information is present on this 3D scan?
Mark
Thanks for the reply Mark,
I see now that the survey has cleaned up the scan and created a 3D dxf file with 3D contours...
I have heard this isnt the best way to receive survey info but its what I have unfortunately.
My main question is what method do you use to construct a #D bunt wall area to allow for temporary storage while the effluent drains into the Oily Sewer Network...
To clarify, on site there are sloped, lined catchment basins below main plant components to handle both stormwater and oily water runoff separately. To model these I assume I would create "catchments" and then assign elevation data to the catchments to model these catch basins.
My query is what method in sewergems can I use to do this.
I have used trex to bring elevation data in the dxf to the manholes etc
Having had a bettter look at the model (I am updating an existing one) I see the engineer brought in two separate elements... Catchment to collect the demand data then Catch Basins set as the outflow elements for the catchments.
Thus my question is, what is the most effective way to create the catch basins...
>Default Storage
>Surface Depth Area Curve
>No Storage
>Ponded Area
As I said my information is in the form of a 3D dxf contour file
Hello LP,
We're having a bit of trouble understanding your situation, which may be due to some of the terminology involved.
In SewerGEMS, the catchment polygon element is used to model rainfall runoff from a piece of land. The user must enter the area, CN and Tc of the catchment, along with the storm information. Depressed areas of the land would effect the total area, CN, etc, but aren't modeled explicitly.
The catchbasin node element is used to model inlets (such as curb, grate, slot) which capture flow from catchment runoff of upstream gutters from a storm drain system. The "surface storage" option (with choices like "surface depth area curve") in the catchbasin is for modeling the storage area above the inlet, which is used in cases where the subsurface network overflows.
From your posts, it sounds like you may be talking about something a bit different. When you say "#D bunt walls" are you referring to Bund Walls for containing chemicals in the event of a spill? If so, you can model the storage effects of this using the pond element. If you have for example Bentley Inroads, you can use that to help get the elevation-area curve for the pond, based on the 3D scan (terrain model/contour I assume.)
I hope this helps.
Regards,
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.
Thanks for all the help...
The model is set up in a way to utilise catch basins as overflow elements in the event of a spill. You are correct in your assumtion that the network has sloped areas within BUND walls with an open grating drain at the bottom linking to the Oily Water Sewer Network. The model specifically is modelling the effect of firewater on the system in the event of a fire at a plant unit...
All firewater must be contained within the bund walls and not overflow causing environmental damage.
The previous designer modelled this using storm principles whereby she creates a storm catchment area, then local storm events that allow a constant duration intensity curve for 90 minutes per catchment.
Is there a more efficient way to model this, she did this because it gave a good indication of the flows into each bund wall area for a constant fireflow over time.
We do have inroads but are working with Bentley SA to finalise preferences for south african use and standards