Abstract
Tsutsusago Dam is located on north-western part of Miyagi prefecture. It was designed as centralcored rockfill dam. On the lefthand abutment of the dam site, groundwater stays at a very low level and raises to surcharge flood level at a long distance from the abutment. This groundwater body is considered to have a multiple water table. To analyse its behavior, the authors installed MGL (Multiple Groundwater Level Measuring) system, and monitord water level for two years. Based on these results, the design on curtain grouting is now in progress.
