WMS:HEC-1 Job Control

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HEC-1 Job Control dialog

The Job Control dialog is used to define general information about the HEC-1 model. Selecting the Job Control command from the HEC-1 menu accesses this dialog. The Job Control dialog can also be accessed by toggling on the display of Job Control cards in the Edit HEC-1 Parameters dialog and then clicking on a Job Control related card in the text display window.

  • Name (ID)
    Enter a name and/or project description identifying the model. Three different name records up to 78 characters each can be entered. The name records will appear at the top of the HEC-1 input file.
  • Beginning Time
    The beginning time of the simulation is defined in this entry. The time should be specified as a single integer number defining the hours and minutes. For example 7:45 am would be entered as 745 and 1:15 PM would be 1315. Do not place a colon between the hours and minutes.
  • Computation Time Interval (IT)
    The computational time interval defines the length in time between hydrograph ordinates. The interval should be specified in minutes, with 1 being the minimum. The total simulation time of the model will be the number of ordinates minus one times the computational time interval.
  • Day Month Year (IT)
    The day, month, and year fields correspond to the date of the first computational time interval. The year is entered as the last two digits only.
    NOTE: The date should be consistent with dates defined on IN records for precipitation and other time series data.
  • Number of Ordinates (IT)
    The number of hydrograph ordinates computed during the simulation is defined in this entry. The length of the simulation is determined by the number of ordinates times the computational interval. If a simulation is run and a complete hydrograph is not developed, then the number of ordinates can be increased to increase the length of simulation. Similarly the number of ordinates can be decreased if the simulation continues long past the falling limb of the hydrograph.
  • Output Control Options (IO)
    In the HEC-1 Job Control dialog, there is an option to set Output print control options. HEC-1 generates an ASCII output file that can be printed or read into any standard word processing program. The information output is controlled by the Output print control options in the HEC-1 Job Control dialog.
  • Listing (*LISTING)
    Causes HEC-1 to echo print input data.
  • Tree Diagram (*DIAGRAM)
    The diagram option causes a diagram of the stream network to be printed to the HEC-1 output file. This diagram should appear similar to the tree representation created by WMS.
  • Units (IM)
    By default HEC-1 performs computations in English units, however metric unit calculations can be specified.
  • Basin Data Optimization (OU)
    Select this option if wanting to optimize unit hydrograph and loss rate parameters in this HEC-1 simulation so the calculated hydrograph will match the observed hydrograph.
  • Routing Optimization (OR)
    Select this option if wanting to optimize routing parameters using observed inflow and outflow hydrographs and a pattern lateral inflow hydrograph for the routing reach.
  • Depth Area Storms (JD)
    See Depth Area Storms below.
  • MultiFlood Storms (JR)
    See MultiFlood Storms below.

Depth Area Storms

HEC-1 Depth/Area Storm dialog

Runoff simulations which use a consistent depth/area relationship as defined in the HEC-1 User's Manual[1] can be defined by clicking on the Define Depth/Area Storms button to bring up the dialog shown below.

  • Rainfall Pattern Type
    Each storm (JD record) may be defined with a set of PI/PC cards giving the precipitation pattern to be used for that depth and area. If no pattern is given for the second through ninth storms then the previously defined precipitation pattern will be used.
Alternatively hypothetical storms may be used to specify precipitation patterns. In such cases only a single storm using the PH record needs to be defined.
The rainfall pattern type is specified using the radio group at the top of dialog. As a new storm is activated, data fields which require input will be undimmed. Data fields which do not apply to the specified pattern type will remain dimmed.
  • Depth Area Storms
    Different depth/area storms can be defined by toggling on a storm from within the Depth/Area Storms portion of the dialog.
  • Precipitation
    The average precipitation is entered in this data field.
  • Area
    The applicable area for this storm is entered in this data field.
  • Defining a Series
    If a standard storm type has been chosen, a rainfall pattern must be defined using the XY Series Editor. Activate the XY Series Editor by choosing the Define Series button. A series for the first storm must be defined. If a series is not defined for the second through ninth storms, the previously defined storm will be used.

MultiFlood Storms

HEC-1 Multiple Storms dialog

Multiple ratios of a given storm event can be specified by bringing up the Multi-flood dialog using the Define Multi-Flood Storms button. The data input options are described below.

  • Method
    Input ratios can be specified using either precipitation or runoff.
  • Ratios
    Up to nine different storm ratios can be specified by toggling on the appropriate check box. All hydrograph or precipitation ordinates are multiplied by the specified value.
Each storm is analyzed during execution of HEC-1 and the resulting TAPE22 file will contain as many hydrographs for each station as there are ratios defined. Display of different storm ratios can be toggled on and off in the Hydrologic Modeling tab of the Display Options dialog.

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