Of which irrigation complex is the area where Ken Darby set the water speed record ?
Ken Warby: Ken Warby (born 9 May 1939) is an Australian motorboat racer, who currently holds the water speed record of 317.58 mph , set on Blowering Dam on 8 October 1978. Blowering Dam:  The dam is part of the Snowy Mountains Scheme, a vast hydroelectricity and irrigation complex constructed in south-east Australia between 1949 and 1974 and now run by Snowy Hydro.
Snowy Mountains Scheme