Grading Drainage Swale/Flow Line Civil 3d

[Anonymous]

Hello, 

I am working on a project that is a flat pad for a building, I am now trying to grade a drainage ditch flow line from the back of the building around to daylight. Can someone help me with this? I would like the ditch to uniformly fall to ditch grade like it would on a corridor and then 4:1 cut/fill slopes to meet existing ground. 

I have played with grading to an elevation and relative elevation in the grading toolbar but it is only letting me enter one elevation to grade to. Is there a way to make it grade to one elevation at the start of my line and finish at another elevation at the end of my line and connect the pieces in between?

Any help is greatly appreciated. Thanks, Trent

[Jerry_Barnes]

I would use a corridor, actually. Assembly would be subassembly the width of the swale bottom, then grade-to-existing subassemblies on either side. Build a profile and adjust up or down it until the swale works for your design. . 

[Joe-Bouza]

This Is How I would do it. 

set the pad elev , place thread daylight left ( add pad & thread to corridor : FL as baseline. run assembly along thread 1:4 DL)

1 to 4.png

[marine2844]

I would agree corridor would work, though I've never had to actually do that...  At most a starting elevation and end elevation... But mostly just a note, "Contractor to... do this or that."  

That said, I've done several swales with corridor and it works great.  Though simple swales, sometimes I just use a feature line or two.  (Unless it's really simple, then maybe just a couple added points in the surface.)

As long as it can be built.... there really isn't a wrong way.