Hello everyone,

I have 6 wells in study area that i want evaluation amount of
phosphorus as contamination and then simulate the situation of
groundwater contamination in future for example 20 or 50 years later.
i have problem when i wanted to select boundary conditions. two kind of
boundary conditions are existed. 1) constant head boundary condition 2)
General head boundary condition. which one better? or shall i select
both of them?