Definitions for "Macropores"
The pores in activated carbon which have diameters exceeding 1000 Angstrom units. An Angstrom unit is 1 x 10 meters.
Spaces in soil fabric, generally 2 mm in diameter.
Pores 100 mm in diameter.
Secondary soil features such as root holes or desiccation cracks that can create significant conduits for movement of NAPL and dissolved contaminants, or vapor-phase contaminants.