Snow Card Inputs - Optional

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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 calling which snow melt algorithm to use

Melt Method Card Description
Hybrid Energy Balance
default (no card)
The Hybrid Energy Balance Method for melting snow is the default, so it is utilized if NWSRFS_SNOW and EB_SNOW are not present in the Project File.
Temperature Index
NWSRFS_SNOW
The Temperature Index Method for melting snow is utilized if this card is present in the Project File.
Energy Balance
EB_SNOW
The Energy Balance Method for melting snow is utilized if this card is present in the Project File.



Cards Associated with All Three Melt Methods

Card Argument Units Description
NWSRFS_SCF     ##.##
real fraction Snow Cover Factor (adjusts for mis-readings in the gage data (see Continuous:Snowfall_Accumulation_and_Melting).
SNOW_TEMP_BASE ##.##
real °C Base Temperature (MBASE) at which melt in snow begins
SNOW_SWE_FILE  ''File
real File Negative Melt Factor.
NWSRFS_FUA     ##.##
real   Empirical Wind Function Factor.
NWSRFS_PLWHC   ##.##
real  % Percent Liquid Water Holding Capacity.


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   Snow Cover Thermal Gradient
NWSRFS_NMF     ##.##
real mm/°C/dt Negative Melt Factor.
NWSRFS_FUA     ##.##
real   Empirical Wind Function Factor.
NWSRFS_PLWHC   ##.##
real  % Percent Liquid Water Holding Capacity.


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