Question: Of which irrigation complex is the area where Ken Darby set the water speed record ?
Context: Sir Henry O'Neil de Hane Segrave (22 September 1896 – 13 June 1930) was an early British pioneer in land speed and water speed records. Seagrave, who set three land and one water record, was the first person to hold both titles simultaneously and the first person to travel at over 200 mph in a land vehicle.  He died in an accident in 1930 shortly after setting a new world water speed record on Windermere in the Lake District, England.  The Segrave Trophy was established to commemorate his life. The World Unlimited water speed record is the officially recognised fastest speed achieved by a water-borne vehicle.  The current record is 511 km/h - achieved by Australian Ken Warby in the "Spirit of Australia" in 1978. The Blowering Dam is a major ungated rock fill with clay core embankment dam with concrete chute spillway across the Tumut River upstream of Tumut in the Snowy Mountains region of New South Wales, Australia.  The dam's purpose includes flood mitigation, hydro-power, irrigation, water supply and conservation.  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.  The impounded reservoir is called Blowering Reservoir. Spirit of Australia is a wooden speed boat built in a Sydney backyard, by Ken Warby, that broke and set the world water speed record on 8 October 1978. Bluebird Mach 1.1 (CMN-8) was a design for a rocket-powered supersonic land speed record car, planned by Donald Campbell but thwarted by his subsequent death during a water speed record attempt in "Bluebird K7" in early 1967. Dorothy Elizabeth Levitt, (born Elizabeth Levi; 5 January 1882, died 17 May 1922) was the first British woman racing driver, holder of the world's first water speed record, the women's world land speed record holder, and an author.  She was a pioneer of female independence and female motoring, and taught Queen Alexandra and the Royal Princesses how to drive.  In 1905 she established the record for the longest drive achieved by a lady driver by driving a De Dion-Bouton from London to Liverpool and back over two days, receiving the soubriquets in the press of the Fastest Girl on Earth, and the Champion Lady Motorist of the World. Blue Bird K3 is a hydroplane powerboat commissioned in 1937 by Sir Malcolm Campbell, to rival the Americans' efforts in the fight for the world water speed record.  She set three world water speed records, first on Lake Maggiore in September 1937, then later twice raising her own record. Donald Malcolm Campbell {'1': ", '2': ", '3': ", '4': "} (23 March 19214 January 1967) was a British speed record breaker who broke eight absolute world speed records on water and on land in the 1950s and 1960s.  He remains the only person to set both world land and water speed records in the same year (1964).  He died during a speed attempt at the Lake District in northern England. Major Sir Malcolm Campbell (11 March 1885 – 31 December 1948) was a British racing motorist and motoring journalist.  He gained the world speed record on land and on water at various times during the 1920s and 1930s using vehicles called "Blue Bird", including a 1921 Grand Prix Sunbeam.  His son, Donald Campbell, carried on the family tradition by holding both land speed and water speed records. 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.
Answer: Snowy Mountains Scheme