| "The amount of counter measure works for landslide is usually designed based on the prior investigation result and the planning safety factor. In large-scale landslide, the construction period tends to be long. Therefore, it is necessary to rationalize the planning method further. We examined indices for evaluating the effect of ground water drainage works and reviewing drainage works plan. Flow rates at collecting borings show that there are several patterns of drainage flow, and that not only the difference of the maximum flowing quantity of each boring but also the difference of total flowing quantity after rainfall is great. Since comparatively steady observation is possible in even creeping landslide, monitoring flow rate at collecting boring is promising as a method of obtaining index for successive reviewing the design of ground water drainage works. The result suggests potentiality of modification method of scale of counter measure works plan by doing flow rates monitoring, successive review of the design, and evaluating the effect of counter measure." |
