You maintain a constant reservoir so that the driving force for water through the porous media column is constant.

(a) Given that you used fine sand for your media in the column (K=2X10-4 m/s) and the column has a 25 cm diameter, what is the flow rate, Q, through the column?

(b) If you added a chemical tracer (conservative) to the inflow at the top of the column, what would be the expected travel time through the column if the porosity was 0.35?

(c) What is the expected arrival time of the tracer at a concentration of 10% of the initial concentration if D=2X10-3 m2/s?

(d) How would the travel times change if the chemical retardation factor of the chemical was 5 from part b and part c?

Constant water level reservoir connected by pipe to porous media