permeability estimate from fines content
permeability estimate from fines content
(OP)
I am trying to come up with a rough seepage estimate for a wet detention pond in which the design normal water level is about 1.5 feet below the groundwater level.
The site is mostly clayey sand.
I used to have a correlation between fines content and permeability, but I just moved offices and can't find anything.
This is one of those things that shouldn't cause a problem but I need data to bring to the permitting agency.
Does anyone know of a rough correlation between k and fines for clayey (or silty) sands?
The site is mostly clayey sand.
I used to have a correlation between fines content and permeability, but I just moved offices and can't find anything.
This is one of those things that shouldn't cause a problem but I need data to bring to the permitting agency.
Does anyone know of a rough correlation between k and fines for clayey (or silty) sands?





RE: permeability estimate from fines content
Here's the relationship given in a military publication...ht
Check the figure on page 10.
RE: permeability estimate from fines content
RE: permeability estimate from fines content
RE: permeability estimate from fines content
k = C.(D10)^2
D10 = diameter for 10% finer
You can use an average value for C, C = 1.
If you take D10 in mm, your k value will come out as cm/s.
If you have even small amount of fines (clays/silts) this may reduce your k dramatically. So Hazen's k value may be your upper boundary since you have clayey sand.
I agree with Ron. 10^-5 cm/s is a good approximation for clayey sand. For fine sands, mixtures of sand, silt and clay I would say the range k = 10^-4 to 10^-6 cm/s.
hope this helps
RE: permeability estimate from fines content