| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Head erosion | Geography | 1: Erosion which occurs in the upstream end of the valley of a stream, causing it to lengthen its course in such direction; lengthening and cutting upstream of a young valley or gully above the original source of its stream, effected by erosion of the upland at the valley head; it is accomplished by rainwash, gullying, spring sapping and the slumping of material into the head of the growing. Source: European Union. (references) | |
| 2: Lengthening and cutting upstream of a young valley or gully above the original source of its stream, effected by erosion of the upland at the valley head; it is accomplished by rainwash, gullying, spring sapping, and the slumping of material into the head of the growing valley. Source: European Union. (references) | |||
Source: compiled by the editor from various references; see credits. | Top | ||
