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cansudemir posted a topic in Using GMSHello, For a very long time, I have been trying to create a numerical model of an aquifer with complex hydrogeology (by using borehole-to-Ugrid option). I had several layers of 4 different materials. But all my efforts were trash. Because, I have never obtain a successful Modflow-usg run. They never converged. Although wetting option was on, the aquifer had so many dry cells. And these dry cells were always at same locations (not near/at the location of wells). It was meaningless. I couldn't run the PEST. So I decided to make my system more basic and created a one-layer model with HK zones. It worked well without the wetting. I have applied pilot points approach for the calibration. And pest is working because the forward run has a successful result. However, this time the calculated residual is too high. I have done many things to decrease the error. But the best result until now is about 7000 (Sum of Squared Weighted Residual Head+Flow) and for Root mean squared residual it is 16. These values are so big. Interestingly, the computed vs. observed head plot (attached) looks not so bad that there should be a way to fit them to the line. I only have head observations in my hand and I don't have any flow observations data. May this be the problem? Or what may be the problem? Could you please help me on this? I would be so happy to hear your recommendations to lower my calibration error to an acceptable value. Note: The computed heads are higher than the measured heads. The boundary conditions are ; specified head along the coast and GHB condition was assigned to some part of the boundary. The model is steady-state. Thank you! Best, Cansu
I went back to a model that I hadn't worked on in 9 months or so. Everything seems to be set-up ok (bc reasonable, mesh, etc), but I keep getting the run error message that the srh_pre-v30.....exe file is unknown (see attached screen shot). Which I thought might mean the program can't find the executable. But when I go to preferences, it is pointing to the right folder and executable. Is running from a previous version a problem? Thoughts?
DeniseS posted a topic in General HydrologyHello, I've been using HEC-HMS for just about two years now and I'm still learning all of the details of it. I have a detention pond which is draining 1.76 acres onto a state highway. I have put in the Elevation-Area Table in the Paired Data. There is an outlet pipe (the only outlet) of 18"; it's inlet elevation is 1278.00. I'm assuming that is the very bottom of the detention pond, because in the drawing, contours are shown for this pond starting at 1279.00. When I run the 2-year Type II SCS Storm of 3.30 inches, the following error occurs and the process is aborted: "ERROR 40254: Computed pool elevation is below minimum table value for reservoir "Detention Pond". There is also another error which follows the above error. It is ERROR 40261: Reservoir routing failed at simulation time "1 January 2000, 00:05:00" for reservoir "Detention Pond". Because I get an error relating to the time control specifications, is there not enough model time for the pool elevation to get high enough to prevent the first error from occurring? Is that what is happening? Or is it something else? This program can do so much and I'm still so very confused over half of it!! I need a one-on-one tutor to tell me, in layman's terms what all of the components are and what their methods are. Thanks for any advice! Denise
Hello, I am running a watershed simulation with HSPF for temperature modeling. The run period is approximately 10 years. When I run the full period, the HTRCH group stops functioning for 3-4 weeks at time, generally a couple times between August and October each year. During these periods the modeled stream temperature becomes unstable and increases >100 deg F. At first I thought it could be a data integrity issue, but when I decrease the run period to isolate these occurrences, the HTRCH group seems to function properly and the modeled stream temperature remains within an appropriate range, throughout the shortened run period. I'm wondering if anyone else has experienced this happening. I've checked to make sure the run is not exhausting the resources on my computer (i.e. RAM, CPU, ETC), and everything seems fine during the run. Thank you, Theo