Bioretention infiltration rates

[Snapper12]

Does anybody know of a good test to use to test the infiltration rates of bioretention soils?

I was thinking of a 5 gallon bucket, cut out the bottom, place a screen over it. Measure the amount of water put in the top and measure how much comes out the bottom after a given time. Can anybody think of a more "scientific" way?

Thanks in advance.