hi,
I am running HEC-RAS 1d model for unsteady flow. i have used SRTM 30m DEM and digitized cross sections at every 3km interval. length of the river is approximately 1200 km and it has five tributaries. at upstream boundary conditions i have given flow hydrographs and at downstream normal depth. i am running model from june to october 2019 but i am getting this error ” Minimum error exceeds allowable tolerance at 01JUN2019 09:00:00″. after reading solution in this forum i have increased HTab parameters to 500 points as i am using 5.0.7 version of HEC-RAS but still it is showing the same error. if i modify particular cross section mentioned in error then it will show error at some other cross section. Even i have tried different combinations of time step interval and simulation time. i have tried from 5 mins to 1 hr. i tried to run for 10 days to 1 month. normal depth also from 0.0001 to 0.1 i tried. but still the same error.
if i am running each tributaries separately then its running fine. only if i combine all the reaches and try to run then only it is showing error. i thought junctions might be the problem. but i tried everything whatever solution i get from user manual, google but its not helping. i am working on this from last three months.
If anybody knows anything regarding this problem please help me.