3 differences between the programs HEC-HMS and HEC-RAS
Today I want to talk to you about two programs of special importance for hydrological simulation, namely HEC-HMS and HEC-RAS. Mastering these tools requires conscious attention and practice. Some differences I can share with you:
1. Different uses?
HEC-HMS is a hydrologic modeling program that allows to establish rainfall-runoff relationships, based on watershed characteristics.?
On the other hand, HEC-RAS is used to make hydraulic models that include rivers and pipes, i.e., modeling of open channel flow systems.?
2. Complementary functionalities
The HEC-HMS program is responsible for the hydrological study. It generates hydrographs that serve as boundary conditions in hydraulic models.
On the other hand, the HEC-RAS program is in charge of the hydraulic modeling study. In addition, it allows delineation of flood plains, dam break analysis and modeling of hydraulic structures such as bridges and culverts.
3. Export of results
In the HEC-HMS program, the hydrograph is calculated with the basin and precipitation data. After this, the results can be exported to different formats for further work in the other information systems.
Within the HEC-RAS program, the entire hydraulic calculation is carried out and the results of draught and velocities are obtained. After this, the results can be exported to ArcGIS to process them and obtain the flood and risk maps.
To conclude, I would say that both tools contribute to the analysis of predictive mapping, in order to establish the limits to which a flood can reach.
Have you used these programs? I invite you to share a noticeable difference in the comments.
Doctoral student | Civil Engineering | IIT Roorkee
1 年I am having a problem while simulating in HEC RAS. Can anyone help me?
Internship at Hinode Sangyo
1 年HEC HMS generates hydrographs and export results to different platforms, whereas HEC RAS assist in, delineating the flood plains and effects are exported to ArcGIS to produce risk or flood maps. The other difference is that in the HEC-HMS adjective "hydrological" is constantly used while in HEC-RAS adjective "hydraulic" is constantly used