Landfill Caps - changes in hydraulic performance with time
Landfill Caps - changes in hydraulic performance with time
(OP)
I'm trying to put together some estimates of infiltration to a closed landfill with different scenarios of cap design (for a legal case)
I'm after some typical values for how hydraulic conductivity of a clay cap, and of a simple geomembrane would vary as they degrade over time. I need to compare the performance of a simple clay cap which is allowed to degrade, and a multi-layer system that is well maintained.
I've searched high and low but can't find any good references on landfill cap performance with the right information. Surely someone out there has done some research on this?
I do not have access the the HELP3 program, which would be very useful. Any pointers towards useful references/papers/organisations/databases would be gratefully received
Many thanks
I'm after some typical values for how hydraulic conductivity of a clay cap, and of a simple geomembrane would vary as they degrade over time. I need to compare the performance of a simple clay cap which is allowed to degrade, and a multi-layer system that is well maintained.
I've searched high and low but can't find any good references on landfill cap performance with the right information. Surely someone out there has done some research on this?
I do not have access the the HELP3 program, which would be very useful. Any pointers towards useful references/papers/organisations/databases would be gratefully received
Many thanks
Bashin' rocks and drillin' holes!
All models are wrong.





RE: Landfill Caps - changes in hydraulic performance with time
RE: Landfill Caps - changes in hydraulic performance with time
RE: Landfill Caps - changes in hydraulic performance with time
RE: Landfill Caps - changes in hydraulic performance with time
HELP3 is publically available from epa - http://cf
.
In general, HDPE is thought to be good for about 300 years and it has a hydraulic conductivity in the 10(-12) cm/sec range, so it can't be compared to clay. The problem is that quality control isn't typically strict enough and after the landfill has settled 8 feet (not uncommon) large pools are probably forming in the liner (or would be except the liner probably has large rips in it by then).
I think monocovers are the way to go. The thickness should be determined based on the local climate.