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HYDROLOGIC MOELING SYSTEM

HEC-HMS is a hydrologic modeling system that allows for event and continuous modeling, with options for lumped or distributed modeling. It supports both conceptual and empirical models, as well as measured and fitted parameter models. This system includes various loss rate functions, basin and precipitation data inputs, and baseflow models.

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HYDROLOGIC MOELING SYSTEM

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  1. HYDROLOGIC MOELING SYSTEM HEC-HMS

  2. Hydrologic Modeling

  3. Event or Continuous • An Event Model simulates a single storm • A Continuous Model simulates a longer period, predicting watershed response both during and between precipitation events

  4. Lumped or Distributed • A Distributed Model is one in which the spatial (geographic) variations of characteristics and processes are considered explicitly. • A Lumped Model is where these variations are averaged or ignored.

  5. Conceptual Model • A Conceptual Model is built upon a base of knowledge of the pertinent physical, chemical, and biological processes that act on the input to produce the output

  6. Empirical Model • An Empirical Model is built upon observation of input and output, without seeking to represent explicitly the process.

  7. Measured-Parameter • A Measured-Parameter Model is one in which model parameters can be determined from system properties, either by direct measurement or by indirect methods that are based upon measurements.

  8. Fitted-Parameter • A Fitted-Parameter Model includes parameters that cannot be measured. Instead parameters must be found by fitting the model with observed values of the input and output.

  9. Start a New Project

  10. Start a New Project

  11. Create Rainfall Gage Data

  12. Basin Data Precipitation Data Computational Time Step Enter Basin Model Data

  13. Loss Rate Function(Event, Lumped, Empirical, Fitted Parameter • Initial and Constant-Rate • NRCS Curve Number (CN) • Gridded SCS CN • Green and Ampt

  14. Loss Rate FunctionContinuous, Lumped, Empirical, Fitted Parameter • Deficit and Constant Rate • Soil Moisture Accounting (SMA)

  15. Loss Rate FunctionContinuous, Distributed, Empirical, Fitted Parameter • Gridded SMA

  16. Transforms • Clark’s Unit Hydrograph • Kinematic Wave • Mod Clark Unit Hydrograph • Snyder’s Synthetic Unit Hydrograph • NRCS Dimensionless Unit Hydrograph • User-Specified S Graph • User-Specified Unit Hydrograph

  17. Baseflow Models • Exponential Recession • Constant Monthly • Linear Reservoir • No Baseflow

  18. Create a Meteorological Model

  19. Enter Control Specifications

  20. Create and Execute a “Run” • View the Results • Exit the Program

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