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Abstract: Tunnel excavation in Mae Ngad - Mae Kuang Water Diversion Tunnel Project has hit several water-bearing zones. Inflow more than 500 liters/minute was frequently recorded but the allowable water inflow level for this project is 60 liters/minute per 100 meters. An insufficient capacity of water pumping of the project results in flooding by as much as 0.5 meters. Multi-standpipe grouting is...