sure, but what exactly is your question?

the main challenge is how to make sure to have lamminar flow.

if you can/want to work in saturated conditions no biggi, just pump in from below.

if you want to work in soil columns at 40% water holding capacity it is getting challenging. if you want to be serious you need to do huge columns. - 50Cm diameter plus depending on the homogeneity of your soil. Flowrates depend on what you want to study and on the hydraulic conductivity of your soil..... what works with a sand does not work with a peat or clay...

Thank you so much Mr. Bester for responding to my query. My question is i have to design a soil column in order to assess the efficiency of different types of soil in pollutant removal from domestic wastewater. For this, i have to design a particular flow rate and retention time for my expts.! So i want to know how do we assign a particular flow rate to soil column made up of variable soil mixtures. My aim is pollutant removal using soil as filter. 

I agree with your answer that lamminar flow is very important. I do not possess any expertise in soil so if you could pls. elaborate it would help me understand better. 

Dear Madam,

We have soil & compost respirometer. If you would like to purchase this system, then please contact us.

Our Contact address: [email protected]

Phone Numbers : 011-2852 4315/4318

Regards

Mohiuddin Choudhury

B.Tech.(E&T), M.Sc.(Phy), M.Sc.(Env. Sc.), PGDEMIA

Senior Application & Instrumentation Engineer (Technical & Service)

Electronics, Instrumentation, Environmental Engineer and Physicist

Read my paper in attachment.

if you need help, you can contact me

Effects of conocarpus biochar on hydraulic properties of calcareous sandy soil: influence of particle size and application depth

thank you so much Alaa Ibrahim I will go through and get back

Leena P Vachasiddha

feel free if you need question

Good

Thanks, it is important topic.