User-specified throughfall fraction

[mranjram]

Hi Rob and James,

I'm trying to use the PRECIP_ICEPT_USER algorithm to create a very simplified representation of canopy interception -- however, when I specify this algorithm in my RVI file and use the :CreateRVPTemplate function, the auto-generated RVP file does not include the expected RAIN_ICEPT_PCT and SNOW_ICEPT_PCT vegetation parameters (it instead lists SAI_HT_RATIO as a veg parameter). Any thoughts on what I could be doing incorrectly? Perhaps another algorithm I've chosen is overriding PRECIP_ICEPT_USER? Or I may be misunderstanding the PRECIP_ICEPT_USER algorithm.

Here are the model details if required:

# --Model Details -------------------------------
:Interpolation INTERP_NEAREST_NEIGHBOR
:RainSnowFraction RAINSNOW_DINGMAN
:PotentialMeltMethod POTMELT_DEGREE_DAY
:Routing ROUTE_PLUG_FLOW
:CatchmentRoute DUMP
:Evaporation PET_CONSTANT
:SoilModel SOIL_ONE_LAYER
:PrecipIceptFract PRECIP_ICEPT_USER #gives unexpected veg parameters

# --Hydrologic Processes-------------------------
:HydrologicProcesses
:SnowBalance SNOBAL_SIMPLE_MELT SNOW PONDED_WATER
:Precipitation PRECIP_RAVEN ATMOS_PRECIP MULTIPLE
:Infiltration INF_PARTITION PONDED_WATER MULTIPLE
:SoilEvaporation SOILEVAP_TOPMODEL SOIL[0] ATMOSPHERE
:Baseflow BASE_CONSTANT SOIL[0] SURFACE_WATER

Also, a quick note on a typo in the RAVEN manual -- the Infiltration algorithm "INF_PARTITION" is incorrectly listed as "INF_PARTITION_COEFF" on pages 29 and 106.

Thanks,

Mark

[jrcraig]

The (admittedly non-obvious) issue here is that you don't have any processes that include canopy storage. I have a fix planned to make this more intuitive for models which don't explicitly include the canopy, but in the meantime, the following will do what you need.

:CanopyEvaporation CANEVP_ALL CANOPY ATMOSPHERE

Thanks for pointing out the manual typo. I've fixed it for the next manual release.

[Levasseur]

The (admittedly non-obvious) issue here is that you don't have any processes that include canopy storage. I have a fix planned to make this more intuitive for models which don't explicitly canopy, but in the meantime, the following will do what you need.

Thanks for the fix Craig!