Kvu - Unsaturated vertical hydraulic conductivity
FS - Factor of safety, typically 2
Epb - Elevation of bottom of pond
Ewt - Elevation of ambient water table
f - Fillable porosity
Ab - Area of pond bottom
v - Height of pond bottom above the groundwater table
Id - Design infiltration rate
Tsat - Time to saturate the soil beneath the pond
V - Volume required to saturate the soil
hu - Height of water to saturate the soil