Can someone please explain the difference between the Set Invert to Start/Stop toggle (true/false) vs the Design Start/Stop Invert toggle? Also, If I need to set a pipe size do I have to start inputting the inverts from that point or will the program adjust the inverts.
Thanks
Hello Bill,
The Set Invert to Start/Stop option is used to define how you want to set the invert elevations for the conduits. If this is set to True, it will use the invert elevation of the start and/or stop node. If this is set to False, you would need to enter the data manually or using something like ModelBuilder. If you have invert data for the conduit that you want to apply to a manhole, you can use the methods mentioned in this link: How to apply conduit start/stop elevations (eg. ground & invert) to adjacent nodes.
The Design Start/Stop inverts is an option for the constraint-based design option with the GVF-Rational solver, which is the default solver for the ORD Drainage and Utilities. If you are using the design analysis type in the calculation options, you can use the Design Start/Stop Invert if you want to see the invert elevations for existing elements adjusted as part of the calculation.
Regards,
Scott
Bill Elam, Jr. said:Also, If I need to set a pipe size do I have to start inputting the inverts from that point or will the program adjust the inverts.
If you have "set invert to start" and "set invert to stop" set to True as Scott mentioned, you would only need to enter invert elevations in the nodes (manholes, catchbasins, transitions, outfall) and the pipe inverts will pick up on the node inverts automatically. If you want the constraint based design solver to set both the node and the pipe inverts for you based on constraints like slope, velocity and cover, you can specify which element(s) have a fixed elevation, around which the solver will design the other inverts. For example if you know the outfall's elevation and want everything else to be designed around that, choose "false" for "Design structure elevation" in the outfall properties, then enter the ground and invert elevation. Make sure the other node elements also have a ground elevation set (it will only design inverts, not the ground elevation). Here are some resources that may help you:
Constraint based design only on certain elements
Tips for constraint-based design
Jesse DringoliTechnical Support Manager, OpenFlowsBentley Communities Site AdministratorBentley Systems, Inc.