I have been trying to run a river model with an applied terrain using Beta 5.0 to only a specific part of a reach. However, the solver has always failed. I tried the instructions regarding the HTab parameters, still it won't work. This time, I reduced the time step to 30 seconds and these were the results.

(I'll try to follow up posting the whole file later.)

And by only a specific part of the model, I mean it like this:

Performing Unsteady Flow Simulation HEC-RAS 5.0.0 Beta August 2015

Maximum iterations of 20 RS (or Cell) WSEL ERROR

26SEP2009 02:22:30 Marikina River Upper_marikina_z 23394 22.53 0.020

26SEP2009 05:56:09 Marikina River Upper_marikina_z 22446.8* 28.65 0.027

26SEP2009 06:00:33 Marikina River Upper_marikina_z 22696.9* 35.46 0.040

26SEP2009 06:00:39 Marikina River Upper_marikina_z 21155.0* 27.85 0.020

26SEP2009 06:00:42 Marikina River Upper_marikina_z 22696.9* 36.34 0.201

26SEP2009 06:00:48 Marikina River Upper_marikina_z 22512.1* 43.68 0.032

26SEP2009 06:00:51 Marikina River Upper_marikina_z 22604.5* 36.08 0.993

26SEP2009 06:01:15 Marikina River Upper_marikina_z 22446.8* 41.88 0.213

26SEP2009 06:01:18 Marikina River Upper_marikina_z 22604.5* 38.05 1.767

26SEP2009 06:01:21 Marikina River Upper_marikina_z 21745.* 32.40 0.069

26SEP2009 06:01:33 Marikina River Upper_marikina_z 22512.1* 47.50 0.173

26SEP2009 06:01:36 Marikina River Upper_marikina_z 22604.5* 37.83 1.166

26SEP2009 06:01:45 Marikina River Upper_marikina_z 22604.5* 39.97 1.976

26SEP2009 06:01:51 Marikina River Upper_marikina_z 22512.1* 49.23 0.107

26SEP2009 06:01:54 Marikina River Upper_marikina_z 22446.8* 40.14 1.887

26SEP2009 06:02:03 Marikina River Upper_marikina_z 22604.5* 40.15 1.131

26SEP2009 06:02:06 Marikina River Upper_marikina_z 22789.2* 40.19 0.292

26SEP2009 06:02:12 Marikina River Upper_marikina_z 22446.8* 42.87 3.707

26SEP2009 06:02:15 Marikina River Upper_marikina_z 22120.8* 42.59 0.261

26SEP2009 06:02:21 Marikina River Upper_marikina_z 22512.1* 44.19 5.319

26SEP2009 06:02:30 Marikina River Upper_marikina_z 22466 54.45 5.458

26SEP2009 06:02:33 Marikina River Upper_marikina_z 22512.1* 41.90 0.730

26SEP2009 06:02:39 Marikina River Upper_marikina_z 22466 63.30 5.612

26SEP2009 06:02:42 Marikina River Upper_marikina_z 22512.1* 56.68 4.788

26SEP2009 06:02:48 Marikina River Upper_marikina_z 22512.1* 88.76 6.492

26SEP2009 06:02:51 Marikina River Upper_marikina_z 22446.8* 71.56 8.311

26SEP2009 06:02:57 Marikina River Upper_marikina_z 22466 141.03 18.341

26SEP2009 06:03:00 Marikina River Upper_marikina_z 22512.1* 111.95 13.109

26SEP2009 06:03:06 Marikina River Upper_marikina_z 22198.2* 318.19 73.182

26SEP2009 06:03:09 Marikina River Upper_marikina_z 22198.2* 234.20 61.609

26SEP2009 06:03:12 Marikina River Upper_marikina_z 19973.2* 15.67 0.114

26SEP2009 06:03:15 Marikina River Upper_marikina_z 19524 24.47 12.407

26SEP2009 06:03:18 Marikina River Upper_marikina_z 20977.5* 10799.05 35.242

**** ERROR: Solution Solver Failed ****

Minimum error exceeds allowable tolerance at 26SEP2009 06:03:18

Marikina River Upper_marikina_z 20453.*

***** Warning! Extrapolated above Cross Section Table at: *****

(The extrapolation may have been caused by model instability)

Marikina River Upper_marikina_z from R.S. 27024 to 26901.6*

Marikina River Upper_marikina_z from R.S. 26820 to 20244.8*

***** Warning! Extrapolated above/beyond Rating Curve (Bridge/Culvert/etc.) *****

(The extrapolation may have been caused by model instability)

At River Marikina River Reach Upper_marikina_z R.S. 27619

At River Marikina River Reach Upper_marikina_z R.S. 19373

*Note that I also tried adding cross sections. However, after interpolating them, I have to remove almost everything of them since they won't match the said terrain.

Any help would be appreciated. I badly needed this for my project. Thank you, guys.