- Water that flows off land.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- a. That part of precipitation appearing in surface streams. AGI
b. The collapse of a coal pillar in a steeply pitching seam, caused either
naturally or by a small shot in connection with pillar robbing. The pillar
is said to have run off. Fay
Dictionary of Mining, Mineral, and Related Terms