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DES 606 : Watershed Modeling with HEC-HMS . Module 2 Theodore G. Cleveland, Ph.D., P.E 29 June 2011. Module 2: HEC-HMS. Applications Overview of HEC-HMS Example 2 – A minimal HEC-HMS model. Applications. HEC-HMS Hydrologic model Peak Flows Hydrographs. Applications.

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des 606 watershed modeling with hec hms

DES 606 : Watershed Modeling with HEC-HMS

Module 2

Theodore G. Cleveland, Ph.D., P.E

29 June 2011

module 2 hec hms
Module 2: HEC-HMS
  • Applications
  • Overview of HEC-HMS
  • Example 2 – A minimal HEC-HMS model.
applications
Applications
  • HEC-HMS
    • Hydrologic model
  • Peak Flows
  • Hydrographs
applications4
Applications
  • Hydrograph Routing
    • Stream reaches
    • Reservoirs and detention basins
    • Hydrograph lagging and attenuation
    • Sub-basin modeling (if appropriate)
modeling principles
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”

modeling principles6
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.

hydrologic models
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
hec 1 predecessor to hec hms
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
hec hms
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!
hec hms10
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
rainfall runoff process
Rainfall-Runoff Process
  • Precipitation
    • Meterology, Climate
  • Runoff
    • Fraction of precipitation signal remaining after losses
  • Watershed
    • Losses
    • Transformation
    • Storage
    • Routing
hec hms12
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

Discharge, Q(t)

hec hms13
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
hec hms14
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
hec hms io files
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
hec hms io files16
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.
hec hms17
HEC-HMS
  • Example 2 – A minimal HEC-HMS model
    • Ash Creek Watershed
    • Use TxDOT research reports to generate certain data elements
    • Illustrate the data requirements and data entry for a minimal HEC-HMS model
    • Illustrate the conceptual similarity to the rainfall-funoff diagram and the HEC-HMS file names.
summary
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.