Last Modified: Oct 12, 2022 13:43

Software Version
HEC-HMS version 4.11 beta 3 was used to create this example. You can open the example project with HEC-HMS 4.11 or a newer version.

Download the Initial project files here

Calibration Initial.zip

Download the Initial Parameter's Spreadsheet:

Punx_Parameters.xlsx

Overview

You will be inputting initial values to each model parameter.  These initial values have already been calculated and computed for you.  You can review how these initial values were estimated from previous tutorials.  

Initial parameters

  1. Open "Punx_Parameters.xlsx" spreadsheet and navigate to the Initial Parameters tab.  
  2. Open the Punx HMS project
    1. Select the Basin Model Sep2018
  3. Populate the Deficit and Constant Loss
    1. Select East Branch Mahoning Creek subbasin element.  In the Component Editor navigate to the Loss tab
    2. Enter in the loss values from the Excel spreadsheet
    3. Repeat for Stump Creek and Mahoning Creek Local
  4. Populate the Clark Unit Hydrograph 
    1. Select East Branch Mahoning Creek subbasin element.  In the Component Editor navigate to the Transform tab
    2. Enter in the transform values from the Excel spreadsheet
    3. Repeat for Stump Creek and Mahoning Creek Local
  5. Populate the Linear Reservoir Baseflow
    1. Select East Branch Mahoning Creek subbasin element.  In the Component Editor navigate to the Baseflow tab
    2. Enter in the baseflow values from the Excel spreadsheet
    3. Repeat for Stump Creek and Mahoning Creek Local
  6. Add observed hydrograph to Mahoning Creek Gage at Punx. The observed dataset has already been prepared for you under Time-Series DataDischarge GagesPunxsutawney
    1. In the Basin Model Sep2018, select the Mahoning Creek Gage at Punx element
    2. In the Component Editor, navigate to the Options tab and select Punxsutawney for Observed Flow.  
  7. Create a simulation run. 
    1. Navigate to the Compute tab
    2. Click on Compute → Create Compute → Simulation Run in the File Menu 
    3. Name your simulation Sep2018.  Select your Basin Model, Meteorological Model, and Control Specifications in the Create a Simulation Run Wizard
    4. Right click Sep2018Compute 

  8. Review your results
    1. Navigate to Results tab.  
    2. Click on Sep2018 and expand the Mahoning Creek Gage at Punx Element.  Plot the Graph and Summary Table to view results


Download the final project file here

Calibration - Initial Param Populated.zip

Questions

  1. How were each of the initial parameters calculated?

    Review excel spreadsheet on Unit Hydrograph and Linear Reservoir Baseflow parameters.  

  2. How do the results look compared to the simulated results?  

    Simulated hydrograph has a larger volume than the observed hydrograph.  Runoff initiates sooner and peak timing occurs 6 hours earlier.  

Continue to Calibrate a Basin Model to Event 1