Has anyone talked about the difference of modeling fills using a ration (e.g. 4:1) versus slope percentage (25%) particaularly regarding transitions?
Example: A 2:1 slope transitioning to 4:1. One could expect the midpoint of this transition to be 3:1. However, the midpoint is 37.5% and not 33%.
If I want to model using ratios and not percentages any suggestions out there?
Transitioning in InRoads is linear and doesn't use the ratio approach as you pointed out. But thinking about construction, it is standard practice to grade the proposed sideslope transition using the linear (%) approach. I think using a ratio and stepping the fill every 50 ft (using 50 ft template drop interval with 50' cross section interval) from say 2:1, then 3:1, 4:1, 5:1, then to 6:1 is unusual. Going from 2:1 and transitioning linearly 200' to a 6:1 is usually the desired grading layout. But if you want to, you could use single station edits or parametric constraints to get the ratios to model as desired. PS if using the ratio approach, I suggest changing File>ProjectOptions, Units&Formats tab, Slope field to "2.0:1" so the slope text is easy on the eyes.
Thanks Brandon.