HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
(OP)
Hi Guys,
I am new to HEC RAS and modelling a small stream about 7 km in length, but at one of the culvert section it is giving me this warning msg and I can see from the culvert output the weir flow and flow inside the culvert is not matching up with the flow. The flow should be 9.15 m3/s but weir flow itself showing more than 400 m3/s. I have attached the profile output and up/down stream cross section. For information, I was using a long cross section at the upstream as there is a huge farmers field and I was trying to see how long the water will go. Should I use the water level and ignore this warning msg? Or need to fix this problem? any suggestion? Thanks.
GS
I am new to HEC RAS and modelling a small stream about 7 km in length, but at one of the culvert section it is giving me this warning msg and I can see from the culvert output the weir flow and flow inside the culvert is not matching up with the flow. The flow should be 9.15 m3/s but weir flow itself showing more than 400 m3/s. I have attached the profile output and up/down stream cross section. For information, I was using a long cross section at the upstream as there is a huge farmers field and I was trying to see how long the water will go. Should I use the water level and ignore this warning msg? Or need to fix this problem? any suggestion? Thanks.
GS





RE: HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
1. During subcritical analysis, while trying to calculate culvert and weir flow, the program could not get a balance of energy within the specified tolerance and number of trials. The program used the solution with the minimum error.
2. During the culvert inlet control computations, the program could not balance the culvert/weir flow. The reported inlet energy grade answer may not be valid.
RE: HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
RE: HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
What are your steady/unsteady flow condition.
RE: HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow
RE: HEC RAS warning msg: subcritical analysis, while trying to calculate culvert and weir flow