pest_lch Subroutine

subroutine pest_lch()

Uses

~ ~ ~ PURPOSE ~ ~ ~ this subroutine calculates pesticides leached through each layer, pesticide transported with lateral subsurface flow, and pesticide transported with surface runoff

~ ~ ~ INCOMING VARIABLES ~ ~ ~ name |units |definition ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ihru |none |HRU number surfq(:) |mm H2O |surface runoff generated on day in HRU ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ ~ OUTGOING VARIABLES ~ ~ ~ name |units |definition ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ lat_pst(:) |kg pst/ha |amount of pesticide in lateral flow in HRU |for the day zdb(:,:) | ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~ Intrinsic: Exp, Min

~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~

units: mm + (m^3/ton)(ton/m^3)mm = mm

compute volume of flow through the layer compute concentration in the flow calculate pesticide lost in surface runoff calculate pesticide lost in tile flow calculate pesticide lost in lateral flow - use surface runoff conc for first layer calculate pesticide leaching

Arguments

None