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.

Card	Argument	Units	Description
PRECIP_UNIF	none		Specifies spatially and temporally uniform rainfall. Also requires: RAIN_INTENSITY, RAIN_DURATION, START_DATE, START TIME. Mutually exclusive with PRECIP_FILE.
RAIN_INTENSITY ##.##	real	mm/hr	Intensity of spatially- and temporally-uniform rainfall. Required only for PRECIP_UNIF.
RAIN_DURATION ##	integer	minutes	Duration of spatially- and temporally-uniform rainfall. Required only for PRECIP_UNIF.
START_DATE [yr mo day]	integers	year month 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.
START_TIME [hr min]	integers	hr 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.
PRECIP_FILE "filename.gag"	file name		Input ASCII file containing spatially and temporally varied rainfall rates (mm hr^-1). See the manual section titled Precipitation Input for a description of the file format. Mutally exclusive with PRECIP_UNIF.
RAIN_INV_DISTANCE	none		Inverse distance squared rainfall interpolation. REQUIRED for PRECIP_FILE. Mutually exclusive with RAIN_THIESSEN.
RAIN_THIESSEN	none		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.