ORIGINAL: koastrc
Those are garbage dumps, I was talking land fills with stuff other than garbage. Methane gas is the gas in garbage dumps. The reason for the vents.
Not sure what
you mean by "landfill" but most people around here seem to use "dump" and "landfill" interchangeably. What type is the landfills you wish to discuss?
FWIW three of the flying fields around here are old dump landfills. Grateful to have them but it sure would be awesome if model aviation was recognized as a little more worthwhile to get some of the better ground.