Snow Card Inputs - Optional

The following tables list all project file cards pertaining to snow accumulation, melt, and melt-water transport. The Hybrid Energy Balance method is the default snow melt method (no additional card required to run this method).

Cards Associated with BOTH Hybrid Energy Balance and Temperature Index Methods

Card	Argument	Units	Description
NWSRFS_FR_USE ##.##	real	fraction	Specifies the fraction of precipitation in the form of rain when temperature drop below MBASE.
NWSRFS_TIPM ##.##	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.

GSSHA User's Manual

3 Project File

3.1     Required Inputs

3.2     Mapping Table – Optional

3.3     Overland Flow – Required

3.4     Interception – Optional

3.5     Rainfall Input and Options – Required

3.6     Infiltration – Optional

3.7     Channel Routing – Optional

3.8     Continuous Simulations – Optional

3.9     Saturated Groundwater Flow – Optional

3.10     Soil Erosion – Optional

3.11     Constituent Transport – Optional

3.12     Subsurface Drainage Network – Optional

3.13     Output Files – Required