John Kleppe, Unversity of Nevada, Reno - Mountain Counties Water ...
John Kleppe, Unversity of Nevada, Reno - Mountain Counties Water ...
John Kleppe, Unversity of Nevada, Reno - Mountain Counties Water ...
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Mega Drought-Will it happen again?Will we be ready?MCWRA & ACWA Region 3 Joint ProgramMarch 15, 2013<strong>John</strong> <strong>Kleppe</strong>,Ph.D,PEPr<strong>of</strong>essor EmeritusUniversity <strong>of</strong> <strong>Nevada</strong>,<strong>Reno</strong>
Mega Drought: Will it happenagain?
200Sunspot Data1801601401201008060402001700 1750 1800 1850 1900 1950 2000
300Sunspot Data2502001501005001910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010
Power2 x 1071.8Period = 11.03851.61.41.210.80.60.40.200 5 10 15 20 25 30 35 40Period (Years/Cycle)
3002502001501005001915 1920 1925 1930 1935 1940 1945 1950 1955 1960 1965
3002001000-100-200-3001910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010
Power1.82 x 1051.6Period = 13.71431.41.210.80.60.40.2010 20 30 40 50 60 70 80 90 100Period (Years/Cycle)
Mega Drought: Will it happen again?There appears to be a cycle <strong>of</strong> about650 to 1150 years. This will be refinedin an upcoming paper in the nextseveral weeks.The last Mega Drought was between900 and 1200 AD.
Mega Drought: Will we be ready?It is up to people like you tounderstand and define theproblem(s), to determine thesolution(s), to assess the risks, andfinally to implement plans tomitigate the Mega Drought(s).
Thank youDo you have any Questions?
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