Most culverts that we have encountered look as if they are thin projecting. However, some of these aren't actually projecting from the headwall. We are just wondering what these should be categorized as? See Attached Picture.
top of page
3 Comments
bottom of page
Hi Dave and Henry,
I am sorry I am only getting to this now. Inlet Type is something that is set when we are going to model the hydraulic capacity. Henry is right in that it is only needed for streams, and also only applies / is needed if the elevations necessary for hydraulic capacity modeling are collected.
It is also a parameter that I QAQC before NHDES or NHGS attempts to model the hydraulic capacity - I check to ensure that the correct type is chosen (or the closest approximation is chosen) as the choice dictates some which equations and coefficients in the model are use - so just tell your field teams to go with their 1st choice based on our training and the information in the protocol, and know that we will be checking it again.
All that said, for this culvert I would probably use 'Thin Projecting' - however, if the headwall were smoother and flush with the sides of the culvert, even if it projected 1-2 inches, I would choose 'Square Edge with Headwall' .
Thanks,
Tom
I used this picture as an example of what we are seeing for streams. If this is a stream, what should we identify this inlet type as?
Just to confirm: Is this is a stream? (has upstream bankfull widths?)
If not, field 23 is not needed