Groundwater Utilization and Landsubsidence in the Southern Kanto District

Abstract

In this paper the author deals with the prediction of groundwater level and landsubsidence accompanied with the groundwater utilization.
The main results of this investigation are as follows.
1) Close agreement between distribution of hydrogeological constants and geological structure is pointed out.
2) As a result of digital simulation, accelerative water level decline in heavy pumping area and recovery depended on the reduction of discharge are showed.
3) Quantitative relation between landsubsidence and amount of discharged water is clarified. The ratio of the former to the latter is 2-20 and its average value is about 5-6.
4) Efficiency of discharge to landsubsidence takes maximum value in the first year and decreases as a time proceeds.
5) By the means of electric analog computer method, a reasonable disposition of observation well and the interference areas which are caused by regional groundwater utilization are examined and he points out that there are some problems in present observation system.
6) He proposes the simple method for prediction of landsubsidence of which idea is based on a black box and points out that there is close agreement between observed and calculated values.