Abstract
In this paper, the relationship was analyzed between pipe flow and pressure potential measured on a surface failed hillslope, as a clue to elucidate the mechanism of moisture supply to pipe, from soils further away from the pipe.
First, values of storage were calculated from the interdiurnal variation of rainfall, and it became clear that values of storage were corresponded to measured pipe flow.
Secondly, a equation was derived, to calculate pipe flow from values of pressure potential measured with two tensiometers. The physical meaning of this equation is considered to be that pressure potential distribution curve in soil on hillslope be approximated by the curve of a steady state.
Thirdly, the applicability of the equation to calculate pipe flow from pressure potential, is closely related to values of storage. To explain this relationship, a conceptual model of “Moisture Supply Area to Pipe” was proposed.
