SewerGEMS Invert Levels Design with Diameters Same

Question

Dear Sir, 
 We have a Sewer Network of more than 5000 Manholes.The Model for it is already built by me in SewerGEMS. All Flows are entered as" Flows Known" for the Manholes. All Conduits are currently selected as "User Defined Conduits". The Current SewerGEMS Model was built via ModelBuilder & the values for Diameters, Flow, Ground Elevations & Inverts were transferred from a Sewer Design Microsoft Excel Spreadsheet & Analyzed in SewerGEMS. 
 Now the problem is that there was an error in the Field Survey & therefore all the Ground Elevations have changed. If I enter these Revised Ground Elevations in SewerGEMS. can it Re-Design the Conduit Start Invert, Conduit Stop Invert & the Manhole Inverts (i.e. Manhole Structure Elevation) Keeping The Diameters Same. The Conduit Diameters are to be kept same only the Inverts are to be Re-Designed. 
 Thanks & Regards, 
 Vikas Kulkarni.

MPachlhofer · Accepted Answer

Vikas, The typical use case, which the program was designed for, is the design of a proposed system where both the sizes and the inverts are designed. Keeping the sizes the same would indicate that you may be redesigning an existing system using the existing conduits but possibly burying them at a different depth. This is a bit of an atypical case, hence the need for a workaround. We certainly appreciate the feedback though and will record this for our product managers to consider for future versions. Here's what you can do to workaround this issue: 1) Open your conduit flextable and add the label column along with the diameter column and place them next to each other. 2) Sort your conduit table by ascending labels by right clicking on the label column header and choosing Sort > Sort Ascending. 4) Highlight all the records for the label and diameter columns and hit the CTRL + C to copy them 5) Open a new Excel spreadsheet and paste the information in. 6) In the conduit flextable add the conduit type, conduit class, and size fields if they're not already available. 7) Global edit the conduit type from "User Defined" to "Catalog Conduit". You do this by right clicking on the conduit type column header and choosing global edit. 8) Open the conduit catalog (Components > Conduit Catalog) and add in some conduit shapes and make a few sizes available for design by checking the box labeled "Available for design?". If you want you can just import some from the engineering library by clicking on the drop down arrow next to the book icon and choosing import from library. 9) In the conduit flextable right click on the conduit class field and choose to global edit it. Choose one of the shapes. Now right click on the size field to global edit that then choose one size for all the conduits. 10) Run the software in design mode to update all your inverts. 11) Open your conduit flextable and global edit the conduit type field to "user defined". Make sure all your conduits are still sorted by label in ascending order. 12) Copy the diameter information from the Excel spreadsheet and paste it back to the diameter field in the flextable. That should do the trick. Regards, Mark

MPachlhofer · Answer

Vikas,

Yes, I believe you can you re-design the start invert, stop invert, & manhole inverts, while keeping the diameters the same. Here's what you need to do.

1) In all you node elements (manholes, catch basins, outfalls, transitions, etc...) set the "design structure elevation?" property to True and enter your desired sump depth. By default this field should already be set to True, so you might just want to double check that it still is.

2) You might also try this although I'm not sure if it will make a difference. In the properties of your conduit Make sure the "design conduit?" field is set to true and the "design start invert?" and "design stop invert?" fields are also set to true.

3) Open the conduit catalog (Components > Conduit Catalog) and uncheck the "Available for design?" option for all the conduits. You will get some yellow user notifications about the conduits not being able to be designed because you don't have any selected for design, but if everything works out like I'm hoping then the only thing this will do is prevent the diameter, shape, and material from changing.

Please let us know if that works for you.

Regards,
Mark

Mark

Sushma Choure · Answer

Hello, 
 I am assuming that , you had sizes in Conduit Catalog when you had designed the project & now you have got changed ground levels. 
 Then, 
 
 In the physical alternatives > select conduit type as user defined so the it will take sizes which you have got from the last design. 
 Change the ground levels with the new data. 
 Again Compute the model> you should get the new invert levels with the same diameters.