Table 1: Operating Conditions Normal High Water Level EL460m Design flood water Level EL460.7m Minimum Operating level EL424m Maximum normal operating draw down rate (EL460m to EL 424m) 133 Days Maximum draw down rate (Emergency) (EL 460m to EL 424m) 14 Days Complete Emptying (Emergency) (EL424m to EL 385m) 15 Days Design Wind Speed 160km/h Earth quake -maximum horizontal bedrock acceleration 0.1g