V-drain - fixed width, variable depth

[Anonymous]

I'm trying to create a fixed width, variable depth drain. So for simplicity sake, a fixed 2m wide (at top edges) v-drain that has no depth at Ch:0m, and at CH:20m is 1m deep.  So, foreslope and backslope of v-drain varies from flat to 1:1 over the 20m. I've been trying to run a  corridor along an alignment (with 1m offsets) using firstly a ditch assembly, then a channel assembly. I've been trying target my profile for the invert of drain and target my alignment offset surface profiles for the top edges of v-drain (to over-ride the fixed slope variables in the assemblies) with no success.   

I've poured through a pile of forums and tutorial videos - but nothing to explain what i'm after. Is corridor the correct procedure to achieve what i'm trying to do, or should i use other means?

Alternately is there a method or notation to use in the slope values to allow them to be variable?

Thanks in advance.

Mark.

[tcorey]

Hello Mark,

Yes, it sounds to me like you should be using a corridor.

If you're modeling a v-ditch for drainage purposes and don't need import quantities for concrete, etc., then you can do this using a subassembly from the Generic tab, LinkWidthandSlope. This subassy has targeting for both horizontal and vertical. In your case, since you said the ditch is fixed-width, you only need to target vertical.

As far as getting it to be 0 depth at start and 1m at 20m, it sounds like you have that figured out. You said, "I've been trying target my profile for the invert of drain." Possibly you misspoke and what you mean is that you are running the bottom of the V along your alignment and design profile, not "targeting" this profile. If this is the control for the assembly, it does not need to seek a target. You probably already know that, but I thought, since you said it the way you did, I would clarify.

Targeting the two offset surface profiles will work ideally.

By the way, you posted in the Civil 3D Customization group. This is where programmers go to help one another with coding. For non-programming Civil 3D questions, like yours, you will probably get better results if you post to the Civil General Discussion Group.

Best regards,

Tim