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OT - Raising Warragamba 1-Mar-2013 At 6:18:28 PM lacto

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James is right 100 is level to the gated spillway and as gated the flow is controllable but once over this water flows over an untrolled spillway hence the statement that fotunately the flows were" safe "as above 190% the flow couldn't be controlled . One fo the problems facing controllers that if the release more water than flowing in then they create the flood and would be liable for any damage it caused even if later flows were far in excess of the intial flood . Flood mitigation should never release more water than is flowing in and releases the excess after the peak has passed but at a greater flow than the inflow .
If warragamba "capacity " were to be increased it is unlikely that the normal storage would be increased as that would reduce the flood mitigation ability and open the operators liable for flood damage . All major dams are undergoing flood capacity to 1 in 1000 (or 10000 )year rain events