Page - 718 - in Book of Full Papers - Symposium Hydro Engineering

deformation and landslide are the major seismic hazards .The monitoring item is shown in table 4. Table 4 Emergency monitoring items following earthquake Number Monitoring item Grade Ⅰ Ⅱ Ⅲ Ⅳ 1 Seismic acceleration ● ● ● ○ 2 Inspection ● ● ● ● 3 Upstream and downstream water level ● ● ● ● 4 Rainfalls ● ● ● ● 5 Vertical and horizontal displacement. ● ● ● ● 6 Crack ● ● ● ● 7 Landslide ● ● ● ○ 8 Seepage discharge ● ● ● ○ 9 Seepage pressure ● ● ● ○ Notes：● mandatory item, ○ optional item 2.4. MONITORING FREQUENCY FOR DIFFERENT ACCIDENTS Monitoring frequency are suggested as the table 5 for overtopping, abnormal seepage and structural instability, earthquake. Table 5 Emergency monitoring frequency for 1 day Number Monitoring item Emergency degree Ⅰ Ⅱ Ⅲ Ⅳ 1 Inspection 1 1~2 2~4 2~4 2 Water level 1~2 2~4 4~8 8~24 3 Rainfalls 1~2 2~4 4~8 8~24 4 Inflow and outflow discharge 1~2 2~4 4~8 8~24 5 cracks 1 1~2 2~4 4~8 6 Superficial deformation 1 1~2 2~4 4~8 7 Landslide surface deformation 1 1~2 2~4 4~8 8 Seepage pressure 1~2 2~4 4~8 8~24 9 Seepage discharge 1~2 2~4 4~8 8~24 10 Underground water level 1 1~2 2~4 4~8 11 Discharge flood pulverization As required As required As required As required 12 Seismic acceleration Real time Real time Real time Real time 718