superimposed drainage

superimposed drainage

[¦sü·pər·im′pōzd ′drā·nij]
(hydrology)
A naturally evolved drainage system that became established on a preexisting surface, now eroded, and whose course is unrelated to the present underlying geological structure.

superimposed drainage

1. A naturally evolved drainage system having little relation to present geological structure because of erosion occurring after the system’s development.
2. A drainage system purposely designed against existing geological structure.