Change in Groundwater Seepage Rate into Lake Biwa

Abstract

A long term measurement of the groundwater seepage rate has been made in Lake Biwa using an automatic seepage meter. The rate decreased from March to August, 1994, due to a decrease in the hydraulic gradient near the bottom of the lake caused by decreasing precipitation. Measurements of the groundwater seepage rate and the hydraulic gradient enable us to obtain the hydraulic conductivity of the aquifer beneath the lake.