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DES 606 : Watershed Modeling with HEC-HMS

DES 606 : Watershed Modeling with HEC-HMS. Module 3: HEC-HMS Elementary Model Theodore G. Cleveland, Ph.D., P.E, M. ASCE, F. EWRI 26-28 August 2015. Module 3. Outline for Module 3. Applications Overview of HEC-HMS Example 3 – A elementary HEC-HMS model. Module 3. Applications.

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DES 606 : Watershed Modeling with HEC-HMS

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  1. DES 606 : Watershed Modeling with HEC-HMS Module 3: HEC-HMS Elementary Model Theodore G. Cleveland, Ph.D., P.E, M. ASCE, F. EWRI 26-28 August 2015 Module 3

  2. Outline for Module 3 • Applications • Overview of HEC-HMS • Example 3 – A elementary HEC-HMS model. Module 3

  3. Applications • HEC-HMS is a Hydrologic Model • Peak Flows • Hydrographs • Hydrograph Routing • Stream reaches • Reservoirs and detention basins • Hydrograph lagging and attenuation • Sub-basin modeling (if appropriate) Module 3

  4. Modeling Principles “ … models are like maps; never final, never complete until they grow as large and complex as the reality they are supposed to represent.” Paraphrased from James Gleick “Genius: The Life and Science of Richard Feynman” Module 3

  5. Modeling Principles A model is a simplification of reality – should capture the excitation-response of the system under study but only as complex as needed. Module 3

  6. Hydrologic Models • Require engineering judgment • Experience helps • Results can be difficult to interpret • Require accurate input data • Judgment here too, some data have marginal influence on results, other data are vital. • Require quality control procedures Module 3

  7. HEC-1 (Predecessor to HEC-HMS) • Separate (individual) programs in 1967 (L. R. Beard) • Unified into a single program in 1973 • Revised in 1981: kinematic wave • PC full version in 1988 • Revised 1991: Extended memory support • Final release 1998 • 32 years development until final release Module 3

  8. HEC-HMS • Evolved from HEC-1 • Project begun in 1990 • HEC-HMS “released” in 1998 • Current version is 3.5 • 21 years of development to date. • Include the HEC-1 period and have nearly 50 years of development – The program “engine” is mature! Module 3

  9. HEC-HMS • Purpose • Replacement for HEC-1 • Foundation for future hydrologic software • Improved interface (GUI), graphics, and reporting. • Newer hydrologic computation methods imbedded • Integration of hydrologic capabilities Module 3

  10. Rainfall-Runoff Process • Precipitation • Meterology, Climate • Runoff • Fraction of precipitation signal remaining after losses • Watershed • Losses • Transformation • Storage • Routing Module 3 10

  11. HEC-HMS • Hydrologic Cycle Components in HEC-HMS (circa 2008) Snowfall Evapo- transpiration Rainfall, P(t) Snowpack Snowmelt Infiltration Loss Land Surface and Vegetation Runoff Runoff Channels Reservoirs Percolation Loss Module 3 Discharge, Q(t)

  12. HEC-HMS • Precipitation • Abstractions • Fraction of precipitation that does not contribute to runoff (and ultimately discharge) • Routing • Watershed routing • Stream (Channel) routing • Reservoir (Storage) routing Module 3

  13. HEC-HMS • Data management • Graphical User Interface (GUI) • Multiple input files • Multiple output files • Time-series in HEC-DSS • All files arranged in a “Project” • Paths to individual files • Can e-mail entire project folders and have them run elsewhere Module 3

  14. HEC-HMS, IO Files • project-name.hms • List of models, descriptions, project default methods • basin-model-name.basin • Basin model data, including connectivity • meterologic-model-name.met • Meterologic model data Module 3

  15. HEC-HMS, IO Files • control-specifications-name.control • Control specifications • run-name.log • Run log; messages, warnings, etc. during a run. • project-name.run • List of runs, includes recent execution time. Module 3

  16. HEC-HMS • Example 3 – A minimal HEC-HMS model • Ash Creek Watershed • Use TxDOT research reports to generate certain data elements • Exercise 3 – A minimal HEC-HMS model • Rocky Run near College Station, TX • Use TxDOT research reports to generate certain data elements Module 3

  17. Summary • HEC-HMS is a computer program for rainfall-runoff modeling • A minimal model is a non-trivial exercise, requires considerable thought to generate data. Module 3

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