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DES 606 Watershed Modeling with HEC-HMS

DES 606 Watershed Modeling with HEC-HMS. Advanced Topics. Advanced Topics. This last module before one more set of exercises and the course examination briefly covers some additional topics of advanced features on HEC-HMS

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DES 606 Watershed Modeling with HEC-HMS

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  1. DES 606 Watershed Modeling with HEC-HMS Advanced Topics

  2. Advanced Topics • This last module before one more set of exercises and the course examination briefly covers some additional topics of advanced features on HEC-HMS • These features are not often part of training, but for large production projects are likely to be useful • Reference is the User Manual

  3. Analysis • HEC-HMS contains some analysis tools that can generate certain statistics from the program with greater ease then exporting results and analyzing externally • Documented in Chapter 14 of the user manual.

  4. Multiple Runs • Exercise 8 will require the analyst to evaluate several different conditions. • Page 243 of the user manual mentions setting up multiple runs. • Utility is obvious; if change is being evaluated, there is some economy is preparing different scenarios before hand, and just running them in a single execution event.

  5. Other Things • HEC-HMS has been illustrated as both a single element calculator and an integrated hydrology quasi-hydraulic modeling tool. • Most of the examples required external data preparation • Expect this step to be the time consuming activity in modeling, and also the most important.

  6. Other Things • Conceptualizing a watershed is important • Simple sketches, by-hand, external to the program are advised • External calculations are required • Esp. for storage-discharge tables, wiers, etc. => This means that diversion and detention models will involve substantial hydraulic considerations before modeling begins

  7. Other Things • Sources of design rainfall are available from the internet, TxDOT Hydraulic Manual, etc. • Need to document (in a report or notebook) the source of values. • The results should be similar, but minor variations that could create arguments, could simply be users choosing different, but authoritative, sources. Cite your data sources.

  8. Other Things • Data management • Whether data are kept in DSS or in external files is a matter of personal preference in smaller projects (or one-of cases) • DSS undoubtedly exists for a good reason; larger projects, or projects that will be shared on a server or by e-mail should probably store all data in DSS and localize the data.

  9. Other Things • Supervising a HEC-HMS study. At some point you are likely to supervise a HEC-HMS analysis either as a client, or contractor. • Agree ahead of time on data sources. If a need arises, agree by consensus • Agree that data, even if stored in DSS, have externally readable mirrors maintained by the contractor and delivered with the final product • Verify that any files sent to you actually run on the recipient’s machines

  10. Other Things • Supervising a HEC-HMS study. At some point you are likely to supervise a HEC-HMS analysis either as a client, or contractor. • Collectively troubleshoot problematic HEC-HMS runs, there is desirable synergy • Carefully isolate calibration runs (I suggest entirely separate project files if at all feasible) • Require a modeling report and a simulation log

  11. Other Things • Supervising a HEC-HMS study. At some point you are likely to supervise a HEC-HMS analysis either as a client, or contractor. • Build the model using as few components and special features as possible. • Parsimony will go a long way in producing a better modeling study! • Don’t subdivide under the illusion of gaining accuracy, probably won’t.

  12. Avoid Temptation to Use as a Hydraulic Model • EM 1110-2-1417

  13. Hydraulics • With experience HMS can do some hydraulics quite well, but the data preparation is not trivial. • If flow reversal is possible, should use a true hydraulics tool • HEC-RAS • SWMM

  14. Stay Current • HEC-HMS changes from time-to-time. • Look and feel will change • Icons move about • Recommend annual visit to website to check status

  15. Geo-HMS • The course entirely ignores the GIS interface of HEC-HMS; however there has been substantial effort in the last two decades to directly integrate HEC-HMS and GIS • There is plenty of talent in Texas to help with GIS-HMS integrated modeling, bear in mind that troubleshooting gridded models is hard!

  16. Geo-HMS • The course entirely ignores the GIS interface of HEC-HMS; however there has been substantial effort in the last two decades to directly integrate HEC-HMS and GIS • Most consulting firms can also provide guidance

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