Is it possible to change the Longitudinal Slope for an inlet in Subsurface Utilities if a Terrain Model is used to automatically delineate the catchment area which drains to the inlet? I am changing the longitudinal slope in the Inlet Table, but the program re-write it with an automatically calculated value.
The slope is being automatically read since you selected to place the node elevation relative to a surface. If you remove the Elevation Reference then you can override the longitudinal slope.
Select Move Node handle and then follow the Key Stroke prompts to change elevation reference (ALT key) then remove elevation reference (CTRL Key)
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Answer Verified By: Alireza Zareie
I'm not sure if this is something that has been broken with 2020 R1, but this trick does not seem to work if the inlet was placed using Civil Accudraw. I confirmed that the Elevation Reference has been removed - as shown in both the Properties dialog under the "Utility" heading, and in the Utility Properties dialog under the "References" heading. But the longitudinal value still cannot be changed.
Karl Dauber, PEAdvance ConsultingLaurens County, SCkarldauber@advconsult.netwww.advconsult.netwww.linkedin.com/in/karldauber
Same here, removing the elevation reference does not allow me to change the longitudinal slope of an inlet manually using ORD Drainage and Utilities
Attach your file and elevation reference.
there is a civil property to use slope of surface that may be playing a part too.
what version are you running?
Just to provide further clarification:
For inlets placed with station and offset using Civil Accudraw, OpenRoads assigns the longitudinal slope based on the vertical profile of the referenced baseline. Therefore, removing the elevation reference is not enough. The longitudinal slope cannot be changed unless its “point constraints” in the Properties dialog are removed (which you can do by simply moving the inlet graphically to a temporary spot and then moving it back to its original location, which removes the civil rule). Then you can change the longitudinal slope. Unfortunately, station and offset data will no longer be available in the Properties dialog but will be available in the Utility Properties dialog under the References heading.
For inlets placed by simply placing a data point, OpenRoads simply applies the slope of the terrain regardless of the orientation of the inlet as the longitudinal slope. This is what you would get using a slope trace: the slope of the drip line.
Neither of the above is correct procedure. Longitudinal slope is the slope parallel to the inlet, which is not the resultant slope of the terrain, and is not necessarily parallel to the baseline (think of an inlet placed on a taper or curb return). Enhancement requests were submitted earlier this year to address these. Perhaps this has been fixed in R2 or R3, but I don't know.