The deposition of selenium in silty clay penetrating phreatic bed has been express in the system, the study were to monitor the deposition of selenium in silty clay at various depths to penetrating unconfined depositions, several experts has express the migration process of heavy metal, but this type of mathematical concept has not been applied to monitor the rate of selenium concentration in silty clay. The study has generated the rate of selenium concentration penetrating phreatic deposition, thus expressing decreasing in concentration with respect to change in depths, the decrease in concentration were as results of impermeable deposition found between three and twelve metres. The generated values were from the simulation produced from the developed model, the study is imperative because the developed model applying this type of mathematical concept has been use to develop model for selenium transport penetrating unconfined bed in the study area. This conceptualized approach is to monitor selenium migrations in soil and water environment.
Keywords: modelling and simulation, selenium, silty clay and phreatic bed]