Practical Application of Multiple Groundwater Level Measuring System

Energetic research and development have been made to achieve miniaturization and the wide use of the previously developed Multiple Groundwater Level Measuring System (MGL System). Following results have been obtained.1) Development of the miniaturized MGL System, which can be installed in 66 mm diameter boreholes, has been completed.2) For an improvement of reliability of measured groundwater pressure, two pressure gauges are installed at one measuring point.3) In the homogeneous sand foundation with the permeability of approximately 10-2cm/s, the seepage velocity of approximately 10-2cm/s does not have a great effect on the leakage of sealing materials from a borehole.4) New system has been developed in consideration of the collapse of boreholes and sliding in landslide area.5) A combination of rubber and fabric packers makes it possible to place the MGL System in confined aquifer.Considering the above-mentioned results, procedure of site planning of the MGL System has been proposed.