HYDROLOGIC MOELING SYSTEM

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HYDROLOGIC MOELING SYSTEM

• HEC-HMS

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Hydrologic Modeling
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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

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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.

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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

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Empirical Model

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

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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.

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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.

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Start a New Project
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Start a New Project
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Create Rainfall Gage Data
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Enter Basin Model Data
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Loss Rate Function(Event, Lumped, Empirical,
Fitted Parameter

• Initial and Constant-Rate
• NRCS Curve Number (CN)
• Gridded SCS CN
• Green and Ampt

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Loss Rate FunctionContinuous, Lumped, Empirical,
Fitted Parameter

• Deficit and Constant Rate
• Soil Moisture Accounting (SMA)

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Loss Rate FunctionContinuous, Distributed,
Empirical, Fitted Parameter

• Gridded SMA

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Transforms

• Clarks Unit Hydrograph
• Kinematic Wave
• Mod Clark Unit Hydrograph
• Snyders Synthetic Unit Hydrograph
• NRCS Dimensionless Unit Hydrograph
• User-Specified S Graph
• User-Specified Unit Hydrograph

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Baseflow Models

• Exponential Recession
• Constant Monthly
• Linear Reservoir
• No Baseflow

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Create a Meteorological Model
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Enter Control Specifications
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• Create and Execute a Run
• View the Results
• Exit the Program