Error 171

[bdgloomis]

I am getting an error 171 on my inlets. The error reads:

ERROR 171 : Curve CB-13-BYPASS has its data out of sequence.
ERROR 171 : Curve CB-13-INTERCEPTED has its data out of sequence.
ERROR 171 : Curve CB-13-SPREAD has its data out of sequence.
ERROR 171 : Curve CB-13-FLOWDEPTH has its data out of sequence.

What is this error? How do you fix it?

[Chris Maeder]

Look at stormwater inlet catchbasin 13. It appears that you have not selected a upstream or downstream link correctly. If you send me your model, I can look at it to see what is causing this problem.

[Corey]

Does an on grade inlet have to have an upstream roadway link? Can something be done to allow for an adverse slope for the outlet culvert for an inlet? I am modeling an existing condition and having difficulty with a few on grade inlets that have culvert with adverse slope. In order to produce an accurate model, the inlet must be on grade, with culvert having adverse slope. Any suggestions?

[Chris Maeder]

An on-grade inlet does not need an upstream curb & gutter link, but it does require a downstream curb & gutter link. Also, you can (if you want) include a drainage area that drains to the on-grade inlet.

StormNET should be able to handle an adverse sloped drain pipe for a stormwater inlet. Make certain you are running the model as hydrodynamic. If you continue to have problems with the model, send me it to review.

[Corey]

I am running the model as hydrodynamic, the inlets with outlet links having adverse slopes are coming back with errors. I have emailed you the file.
Thanks for your help,
Corey

[Chris Maeder]

Corey:

We reviewed your StormNET project file and observed that the inlets (on-grade) which are giving you problems have three outlet links. Presently StormNET supports only two outlet links for on-grade inlets. One stormwater sewer pipe and a bypass gutter link must be defined for on-grade inlets.

In your model, Inlet-1 has two outlet links as "Bypass-1" and "Con-1". However, in addition, this inlet has also link "Con-10" connected between the "Inlet-1" and "Inlet-10" which has an adverse slope. As this link has an adverse slope, it becomes an "outlet" link for Inlet-1 (although it is defined as an "inlet" link).

StormNET can have inlets with adverse sloped stormwater pipes. However, presently StormNET does not support on-grade inlets with more than two outlet links. We have asked our development team to see if they can add support for this situation.