I need to design a grassed waterway with a parobolic shape that will be cut down through a field. I have seven control points that I need to incorporate into the cross section, then the assembly needs to daylight onto the surface. I've made an assembly, but I can't get it to daylight properly. I'm using the generic length/width/slope sub-assembly with the generic daylight subassembly at the ends.
What I done was to first lay down an alignment, then profile that alignment with sampling offsets of 15,-15 on my profil. From that, I can lay in a proposed centerline using the offsets as my banks. When I run the corridor, I get errors regarding those offsets for some reason? Are the offsets the problem?
I want the daylight segment to either come up to the surface on a 10:1 whenever possible so water gets into the waterway nice and gently. If the daylight can't possibly tie in with positive slope, I want the daylight to go down to the surface on a 3:1 fill. Am I using the correct subassembly for this?
I work in a Soil and Water Conservation District, so I'm no professional engineer, so be kind and basic. Thanks.
Just judging from your description, it seems that the conditional subassemblies may be what you are looking for:
Trying to ensure that I understand what you have described:
- You have seven control points which define the typical cross section - correct? A sketch showing what they look like would help.
- You are sampling the existing surface at 15' offset, and then using those offset profiles in your corridor targets somehow. Are you intending that the daylight should always tie in at a 15' offset regardless of whether it's cut or fill?
- If you want to tie into a specific offset while also maintaining a specified cut or fill slope then that is probably possible, but you will likely need to use conditional cut or fill subs, as well as others.
Need more info - a sketch would be useful.
Sorry for the slow responses, I've been on vacation.
I hope this quick sketch shows what I'm trying to reproduce in my corridor. You'll see on one end that I need to fill (3:1 both sides) and the other end needs to blend to existing with positive slope (10:1 works, but so does any positive number).
There is actually a typo in my quick sketch. The depths from left to right need to be 0.0, 0.50, 0.75,1.0, 0.75, 0.50, 0.0.
Ok, how do I override the daylight?
I just need to learn how to put together the assembly for a 30' top width waterway. I can use that one as a template to do any other top width. Which sub assemblies should I be using?
Thanks for all your help, especially since the above reads like a federal govt spec, and that's never a good thing...