Hello,
I am currently placing inlets, to automate getting the longitudinal values. I am attaching a reference terrain to the inlets. I had merged my existing and proposed terrain into one combined final terrain. I am placing my inlets. The longitudinal slopes that the inlet is pulling is off from my measured slopes in the file. My measured in 5%, where the slope generated from the inlet is 10%.
I have doubled checked that the merged terrain is correct with the proposed roadway model. Is there any way to check where the inlets are measuring from?
Thanks,
Emily
It depends on how you place the inlet. If you use Civil Accudraw to place the inlet by station and offset from an identified baseline, then a station and offset "rule" will be created for that inlet and the longitudinal slope will be taken from the active profile for that baseline, regardless of the inlet's rotation relative to that baseline. If you do not use Civil Accudraw and instead place the inlet graphically, the longitudinal slope is taken from the elevation reference you identified when placing the inlet. If a terrain, then the longitudinal slope is taken as the "trickle" line - the path a drop of water would take on the terrain. This will be different than the slope you would measure along the gutter line. You might try using a corridor model feature (like the gutter flow line) as your elevation reference instead of using the terrain.
Karl Dauber, PEAdvance ConsultingLaurens County, SCkarldauber@advconsult.netwww.advconsult.netwww.linkedin.com/in/karldauber
Thanks for the response.
I just used civil accudraw to place the inlet, it looks like that did the trick for populating the correct longitudinal slope; however, the cross slope is still being populated as the longitudinal slope when i toggle on "use road cross slope".
From your images it appears that longitudinal slope is 5.14% and cross slope is 5.42%. So they are different. Verify that the correct terrain is active. It should be the terrain representing the roadway surface.
Karl,
I verified that the terrain was correctly activated, from the terrain slope the cross slope in front of the node should be 3.03%.
I suspect something in our node cell is oriented the wrong way pulling an invalid cross slope value.
Yes, I should have mentioned that. The “alignment line” in your cell needs to be pointed away from, and perpendicular to, the gutter flow line, and towards the gutter flow, not behind the curb.
Answer Verified By: Emily Gordon