varinit Subroutine

~ ~ ~ PURPOSE ~ ~ ~
this subroutine initializes variables for the daily simulation of the 
land phase of the hydrologic cycle (the subbasin command loop)

~ ~ ~ INCOMING VARIABLES ~ ~ ~
name        |units         |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ ~ OUTGOING VARIABLES ~ ~ ~
name        |units         |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
albday      |none          |albedo for the day in HRU
bioday      |kg            |biomass generated on current day in HRU
bsprev      |mm H2O        |surface runoff lagged from prior day of
                           |simulation
canev       |mm H2O        |amount of water evaporated from canopy storage
ep_day      |mm H2O        |actual amount of transpiration that occurs on
                           |day in HRU
ep_max      |mm H2O        |maximum amount of transpiration (plant et)
                           |that can occur on day in HRU
es_day      |mm H2O        |actual amount of evaporation (from soil) that
                           |occurs on day in HRU
hhqday(:)   |mm H2O        |surface runoff from HRU for every hour in day
inflpcp     |mm H2O        |amount of precipitation that infiltrates into
                           |soil (enters soil)
lat_pst(:)  |kg pst/ha     |amount of pesticide in lateral flow in HRU for
                           |the day
qp_cms      |m^3/s         |peak runoff rate for the day in HRU
pet_day     |mm H2O        |potential evapotranspiration for day in HRU
qtile       |mm H2O        |drainage tile flow for day in HRU
sepday      |mm H2O        |percolation from bottom of the soil layer on
                           |day in HRU
snoev       |mm H2O        |amount of water in snow lost through 
                           |sublimation on current day in HRU
snofall     |mm H2O        |amount of precipitation falling as freezing 
                           |rain/snow on day in HRU
snomlt      |mm H2O        |amount of water in snow melt for the day in 
                           |HRU
sw_excess   |mm H2O        |amount of water in soil that exceeds field 
                           |capacity (gravity drained water)
uno3d       |kg N/ha       |plant nitrogen deficiency for day in HRU
usle_ei     |none          |USLE erodibility index on day for HRU
vpd         |kPa           |vapor pressure deficit
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~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
name        |units         |definition
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
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~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~