Effect of Interceptive Layer Methods to Extended Area of Spring Source

Studies on spring water control in cultivated land (II)

Abstract

Interceptive layer is effective for controlling spring water as it catch spring position in a wide area. In this paper, we report the effect of interceptive layer which was arbitrarily installed to the spread spring source.
The characteristics of groundwater dynamics were analyzed by Yoshida and other's method of finite element methods (1993). The results obtained are summarized as follows:
1) The potential in center of spread spring source greatly influenced groundwater table.
2) When interceptive ratio attained 20 percent or more, the groundwater level lowered remarkably from the initial level. In this case, interceptive layer covering the half area of spring showed nearly the same effect as complete cover.
3) In the case that spring source was located at a special place between both side drains, the drainage effect decreased markedly. This bad condition was improved by moving the center of interceptive layer a little from spring source.