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Lecture

Lecture 34.pdf

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School
McMaster University
Department
Earth Sciences
Course
EARTHSC 2GG3
Professor
Sergei Basik
Semester
Fall

Description
Flood Frequency Flood Related Hazards Lecture 34 November 22 2013 Great floods have flown from simple sourcesAlls Well that Ends WellSir William Shakespeare 15641616Image Debris flow that occurred in the foothills of the San Gabriel Mountains north of Los Angeles 2010 Courtesy of USGS1 Flood Frequency 11 Recurrence Interval When natural events are random it is helpful to represent their frequency as an average time between past events a recurrence interval also known as a return time Flood frequency recorded as recurrence intervalAverage time between floods of given sizeLarger flood discharges on given stream have longer recurrence intervals between floodsCalculated recurrence interval depends on total number of years in flood record and rank of flood in question
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