A broken levee on the Mississippi near Gulfport Illinois June

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Presentation transcript:

A broken levee on the Mississippi near Gulfport Illinois June 18 2008

Thousands of acres of farmland under water after breaching of a levee June 18 2008

Flooding at River Grove, Illinois April 2013

Flooding near Wheaton Illinois, April

Mississippi and Missouri in drought Mississippi and Missouri in 1993 Flood

Formation of Meanders and river action on bends

Flood Control

Flood Plain Channel Bluff Bluff

Prediction of Floods Size of Past Floods Recurrence interval Average length of time between Floods of the same size 2 year 100 year

W. W. Norton. Adapted from U.S. Geological Survey Fig. 17.38 a W. W. Norton. Adapted from U.S. Geological Survey

Probability of A Flood Probability = 1/Recurrence interval Probability of 10 year flood this year = 1/ = 0. = % Probability of 10 year flood next year

Recurrence Interval from Probability 50% probability of a flood What is Recurrence Interval? 50/100 = 1/ Recurrence Interval = years

1993 Flood

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