Happy MLK day, everyone! I need some help on the following question.
A grate inlet in a roadside ditch or median is basically in a sag to collect runoff from vicinity area/ditches coming to it. But how do I set it up in Geopak Drainage? I can model it as a regular sag inlet but then I realize it is different from a normal sag inlet at the pavements (for example, it does not have spread section, and most of time it does not have the same right/left slope as PGL). any hint? Thanks.
All those settings can be set at the drainage library for that node
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Odd that I have the same question within a day of you asking. Did you find an answer to this? I'm placing inlets in the median ditch and always seem to have bypass flow. I feel like there must be a setting or it has something to do with the spread setup. How would I reflect the ditch slope to the inlet AND the 6:1 slopes on each side of the inlet?
Thanks Nico. The problem is for DOT projects, I am required to use the standard DOT drainage library and not come up with my own ( I actually doubt I can since a lot of inlet parameters are from field or lab experiments and are thus empirical).
Let me elaborate my question again.
For example, there is a grate inlet - Type M. I can use this Type M inlet at sag of pavement without any further revisions. however, what I should do if I want to employ it in a median/ditch sag (I know I can since I saw it is used extensively in some go-by DOT projects). In this situation (median or ditch sag), how should I set it up? there is really NO spread concern - so spread criteria not applicable (??), but I do need to know the max head to make sure it does not go higher than top of median/ditch bank. I hope I make my question clear. Thanks again for any help.
thanks for showing interest to my question. I have no clear answer yet.
I might have figured it out. Since the spread is normally in front of the inlet, I used the ditch slope and distance to the upstream catch basin for my spread section.
Then when I got to the last catch basin (sag)I added the cross slope of the ditch left and right of the catch basin.
The only thing I'm not sure about is the % discharge left and right. It seems like it should have an option for discharge % from in front..i.e. along the ditch slope.