View source for Project File:Rainfall Input and Options – Required

The following table lists all project file cards pertaining to rainfall input.  Either, but not both, PRECIP_UNIF or PRECIP_FILE must be included in each GSSHA project file.  

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! Card !! Argument !! Units !! Description
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| <pre>PRECIP_UNIF</pre> || ''none'' || &nbsp; || Specifies spatially and temporally uniform rainfall.  Also requires:  '''RAIN_INTENSITY, RAIN_DURATION, START_DATE, START TIME'''.  Mutually exclusive with '''PRECIP_FILE'''.
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| <pre>RAIN_INTENSITY  ##.##</pre> || ''real'' || mm/hr || Intensity of spatially- and temporally-uniform rainfall.  Required only for '''PRECIP_UNIF.'''
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| <pre>RAIN_DURATION  ##</pre> || ''integer'' || minutes || Duration of spatially- and temporally-uniform rainfall.  Required only for '''PRECIP_UNIF'''.
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| <pre>START_DATE [yr mo day]</pre> || ''integers'' || year<br>month<br>day || Year, month, and day of the beginning of a simulation.  Required only for '''PRECIP_UNIF'''.  See section on rainfall input for format description.  This card can also be used with long term simulations to start the simulation at a point other than the beginning of the hmet time series.  See long term simulation information.
|- 
| <pre>START_TIME [hr min]</pre> || ''integers'' || hr<br>minute || Hour and minute of the beginning of a simulation.  Required only for '''PRECIP_UNIF'''.  See section on rainfall input for format description.  This card can also be used with long term simulations to start the simulation at a point other than the beginning of the hmet time series.  See long term simulation information.  
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| <pre>PRECIP_FILE  "filename.gag"</pre> || ''file name'' || &nbsp; || Input ASCII file containing spatially and temporally varied rainfall rates (mm hr<sup>-1</sup>).  See the manual section titled <font style="text-decoration: underline">Precipitation Input</font> for a description of the file format.  Mutally exclusive with '''PRECIP_UNIF'''.  
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| <pre>RAIN_INV_DISTANCE</pre> || ''none'' || &nbsp; || Inverse distance squared rainfall interpolation.  REQUIRED for '''PRECIP_FILE'''.  Mutually exclusive with '''RAIN_THIESSEN'''.
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| <pre>RAIN_THIESSEN</pre> || ''none'' || &nbsp; || Thiessen polygon (nearest neighbor) rainfall interpolation.  Recommended particularly when rainfall rates are derived from radar estimates.  REQUIRED for '''PRECIP_FILE'''.  Mutually exclusive with '''RAIN_INV_DISTANCE'''.
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