robross

As always, i appreciate the help. You guys go above and beyond. I had already changed the ds boundary conditions to normal depth, as I read on a blog that flow hydrographs are really tricky for those. Here is a question you might know the answer to offhand: I have flow changes for the one week I'm trying to simulate arranged both as actual flow change (i.e., -10.45 for a diversion, and 6.6 for a return), as well as tributary data in the same setup. I also have a "running total" of what flow in the channel should be (i.e., 88 cfs - 10.45 at the diversion, so 77.55). What should I be inputting for flow change and boundary condition? Thanks a bunch, Rob

Thanks, Clark. I have been playing with the time step, to no real avail - it seems like the least unlikely results come from a 12 hour time step, but I am still getting 50 year flood stage from seasonal low-flow input. I am wondering if I need to do initial flow change locations that correspond with all of the flow hydrograph/lateral inflow hydrograph/normal depth boundary conditions? Thanks, Rob

Hi Russ, I don't know if that was the same issue we had; I think we already had 8.3.3 running. I discovered that the TIN dataset was what was crashing our instance. I used the TIN to extract cross-sections, and then removed it. No problems since. Rob

Ok, I have a steady state model for the reach with no diversions, all diversions, and one diversion, and it seems to be behaving itself nicely. I am now having issues with creating a transient state simulation with the same framework. I am using a one week period doing a one day time step, with basically the same data that went into the steady-state, but for the whole week insetad of one day. It is not going so well; I am getting error messages about the matrix solution failing and error exceeding maximum tolerances. I am using flow hydrographs for the top and bottom boundary conditions, and uniform lateral inflow for the flow changes inside the system due to the ditches. Any thoughts on changing boundary condition types, or any other things that might be going on here? Thanks, Rob

Well, loading the map file put most of the important stuff back up, and worked just fine. I had to retrieve a new TIN, and extract my cross sections again, but other than that, it seems ok. I am working on schlepping the 37 MB zip file of the model that wasn't opening to tech, just to see what was causing it to freeze. Thanks, Rob

I will try loading the map file first thing, and in the meantime, I will send the files to tech support. Thanks for the replies, Chris - always appreciated. Rob

Anyone know of any recent issues with WMS becoming unresponsive? I have a model built that was doing just fine last night, but WMS now freezes when opening. I have installed the latest update, rebooted, restarted several times, and tried copying the files to different sources, all to no avail. It reads through all of the components, and then goes blank with a rotating hourglass. I have also tried to let it take its time opening, and after 45 minutes, still no go. Any thoughts on what could have changed within the last 12 hours? Thanks, Rob

Is there another way to handle the diversions? I have four irrigation ditches ranging from 3 to 15 miles in length, and the creation of the bank arcs is causing WMS to do a Houdini-like crash, where the active window goes away without even a crash warning. Can I just do a small partial branch downstream, and a small partial branch returning, since I have discharge data both at diversion and return? Thank you! Rob

Yep, got the cross sections merged last night, and am about to put the ditches and tributaries in. 17 river miles, four ditches, three tributaries, and 396 cross sections. I'll let you know how it goes. Thanks, Rob

Thanks for the reply, Chris! If I have modified cross section saved in an .idx, I can just merge those into extracted cross sections, right? It sounds like I need to widen my cross sections beyond the channel surveys that I did in order to generate the downstream length measurements. For the downstream branches of the diversions, I would just put change in flow at those branches where they divert and return? Thanks, Rob

And, as an afterthought, has anyone had problems with WMS not populating the downstream overbank and channel distances when exported to HEC-RAS? Thanks!

Hi all, I am trying to figure out how to treat four irrigation ditches over the mainstem of a HEC-RAS in WMS model. Each one diverts and returns to either the mainstem or a tributary right before the tributary joins the mainstem. Any input on how to place diverted flow? Add a outlet point? Thanks for any thoughts or ideas, Rob

No worries, I will look over the tutorial again, and send the files in if I can't figure it out. Thanks, Rob

The arcs are all set to the appropriate coverages, and the cross sections have been extracted and edited. I think the problem is in the import of the arc sets to HEC-RAS. Thanks Clark! Rob

Hi all, I am working towards a working HEC-RAS model from WMS input. I have a centerline, channel banks, and cross sections to define model geometry in HEC-RAS. I have saved as a 1-D network schematic, but when bringing it into HEC-RAS, it will only use one of these coverages to define geometry, so I get error messages saying that there are no cross sections. Any thoughts (Chris and Clark, I'm looking at you)? Thanks, Rob