Seite - 1333 - in Book of Full Papers - Symposium Hydro Engineering

Figure 8. Location of leakage measuring system for the subject dam In order to analyze the influence on earthquake, subject analysis period is decided to 2 months which are Before and after 1 month based on the day (12th, Sep. 2016) of occurring earthquake in common with displacement measuring. Analysis for measured leakage data was performed by excluding the data of rainy period because precipitation is negative influence to exact leakage measuring. Figure 9 shows status of leakage measuring for the subject dam. Simply comparing with quantity of leakage before and after earthquake is not reasonable because precipitation quantity and duration are different every times and analysis period is relatively short term. Important point was that leakage status before and after earthquake was similar, variation was stable. 16th September, Quantity of leakage and turbidity were increased but decreased gradually after that. The reason that leakage increased was precipitation. Therefore, it seemed that leakage was not affected by earthquake and the leakage measuring system be considered to have no problem to operate. Leakage Measuring System Cutoff Wall Upstream slope Downstream slope 1333