Update on this post. I created a new HY-8 file and entered the data anew. This time, I get the same W.S.E. for both culverts. Now it appears to work.
I stumbled upon a similar post here from 10/2008 where the user had the same problem. Perhaps an odd glitch in the coding?
Thanks in advance...
I am getting an odd error in HY-8 when analyzing multiple culverts.
My situation is this - a new road crossing, with two arch RCP pipes. The first is a 62x102 with the invert buried into the stream bed 12". The second pipe is a 54x88 with the invert at the stream bed elevation. When running...
Does anybody have or perhaps know where one could find a Civil 3D pipe library (the parts lists and XML files) for corrugated metal pipe, corrugated metal arch pipe, and concrete arch pipe?
These materials are not in the standard library and I am looking to see if anybody else has created any...
I'm surprised that the local soil conservation district or environmental quality department would allow a permanent dirt lot. Here in Pennsylvania, this lost would have to be vegetated or completely covered in gravel.
This situation may produce too much sediment for a hydrodynamic separator...
Oops, typo on my part. That should read 2.5%.
As for the potential for orifice flow, that's a good question. Without running a hydraulic model, I'd guess that orifice flow would be a greater concern if the pipe is surcharging a bit. Perhaps I'll try to model such a system in StormCAD if I...
Accidentally hit 'submit'
I've worked on a similar situation before, though with smaller pipes and lesser flows. In this case, it sounds like to have adequate space to do two drops in the new run of 60" RCP. This will likely require at least an 84" inside diameter manhole to accommodate the...
I've worked on a similar situation before, though with smaller pipes and lesser flows. In this case, it sounds like to have adequate space to do two drops in the new run of 60" RCP. This will likely require a
A good rule of thumb is to have the minimum grade set at 2% - the same ideal used for vegetated channels. That allows a little wiggle room if the grade only comes to 1% or so.
As for protecting the storm sewer from sedimentation, a grass swale or grass filter strip is a good way to go. A...
Is this an open channel or closed conduit (i.e. pipe) flow condition? A stepped approach with pipes/channel at slopes less than 5% or so and a few vertical drops in the system may help to reduce velocity while still providing adequate capacity.
Sounds like a hydraulic jump, which isn't uncommon. If the model is set correctly, this probably means that there isn't enough capacity to convey the 100-year storm event.
As for including the rail, I don't know, but if the goal is to prevent overtopping, use the lowest elevation part to...
100% runoff (CN=98 or Rational C=0.95), with a Tc based upon the travel time through the discharge pipes to the detention bed.
And don't, don't, don't use the area under the field as the detention facility. This may cause the field to float during rainfall events. You want the facility to...
Let's simplify.
Does the municipality or state have a target treatment volume, i.e. 2" of runoff? If so, then this is easy.
To determine the volume of runoff to be managed, multiply the roof area (square feet) by the rainfall depth (in inches), then multiply by 1/12 to covert to cubic feet...
