Page - 893 - in Book of Full Papers - Symposium Hydro Engineering

increasing the strength of compacted sand during the earthquake. Hot dipped galvanized steel sheet pile will be placed on both side of the GRS wall. Sheet piles will work as a water tightness barrier. In addition, it designed to minimize lateral movement that may cause from the weight of new GRS wall to the exiting soil below the cut level. And the second is to build the 3 m diameter tunnel as the additional outlet to control the water level for flood management. The existing outlet diameter is 1.5 m that is small and the maximum discharge is about 30 cms. It is difficult to manage flood because the reservoir volume of Mae Suai Dam is less than the average annual inflow. Adding the new outlet tunnel should be done as shown in Figure 11. The maximum discharge capacity is about 100 cms that less than the capacity of the downstream river. Existing Rehabilitation (GRS Wall) Fig. 10 Dam Crest Rehabilitation Detail RCC Block 893