1939 A. K. Lobeck v. 159 Run-off..occurs in two ways: (a) as surface run-off..; and (b) as ground-water run-off,..often called seepage flow.
1976 A. J. Raudkivi & R. A. Callander i. 2 This movement is complicated by the presence of ground air, most of which is expelled from the ground or dissolved in the seepage flow.