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Q: What is it meant by a flood recurrence interval of 50 years?
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What is meant by recurrence interval of an earthquake?

How often an earthquake recurs on a section of fault, or basically how long the stresses take to build up again after an earthquake occurs. Usually, for most active faults the recurrence rate tends to be hundreds or thousands of years.


What is flood recurrence interval?

The Recurrence Interval is an estimate of the average time between past occurrences of random events. Typically, the period of record of these events must be at least 10 years to be statistically significant. Statistics are used to estimate the probability of the occurrence of some event. The following is from a USGS water science publication: "Statistical techniques, through a process called frequency analysis, are used to estimate the probability of the occurrence of a given precipitation event. The recurrence interval is based on the probability that the given event will be equalled or exceeded in any given year." The equation for figuring Recurrance Interval(RI) is: RI = (n+1)/m where n = number of years in the record, m = magnitude ranking For example; A flood event that had a peak stream discharge of 75,800 cfs ranked as the 3rd largest discharge over a 30 year record period. Therefore the RI is: RI = (30+1)/3 = 11yrs. ;meaning the likelihood of a flood event of that magnitude recurring within 11 years is fairly high. To estimate the exact probability of this event actually ocurring requires one to apply statistical analysis of probability; that is' P = 1 - (1 - 1/RI) (expression in parenthesis is raised to the X power where X is the number of years - 11 in this case)


What does it mean to dream the same dream of driving through a flood from years ago?

The recurrence of a dream from years ago suggests that the dreamer is in a relationship or situation that repeats one that occurred years ago. In this example, the flood suggests that the dreamer is feeling overwhelmed and desperate in much the same way as years ago.


What is recurrence interval?

The Recurrence Interval is an estimate of the average time between past occurrences of random events. Typically, the period of record of these events must be at least 10 years to be statistically significant. Statistics are used to estimate the probability of the occurrence of some event. The following is from a USGS water science publication: "Statistical techniques, through a process called frequency analysis, are used to estimate the probability of the occurrence of a given precipitation event. The recurrence interval is based on the probability that the given event will be equalled or exceeded in any given year." The equation for figuring Recurrance Interval(RI) is: RI = (n+1)/m where n = number of years in the record, m = magnitude ranking For example; A flood event that had a peak stream discharge of 75,800 cfs ranked as the 3rd largest discharge over a 30 year record period. Therefore the RI is: RI = (30+1)/3 = 11yrs. ;meaning the likelihood of a flood event of that magnitude recurring within 11 years is fairly high. To estimate the exact probability of this event actually ocurring requires one to apply statistical analysis of probability; that is' P = 1 - (1 - 1/RI) (expression in parenthesis is raised to the X power where X is the number of years - 11 in this case)


Why do volcanologist believe that mt st Helens will erupt again?

Yes, it is extremely likely that Mt. St. Helens will erupt again. The average eruption recurrence interval is every 100-300 years.


What is the recurrence rate following hemorrhoidectomy?

Rubber band ligation has a 30-50% recurrence rate within five to 10 years of the procedure whereas surgical resection of hemorrhoids has only a 5% recurrence rate.


What is a tricentenary?

An interval of 300 years.


The interval of Halley's Comet is?

75 to 76 years


What is the official interval of olympic games?

4 years.


What is the definition of two year interval?

2 years.


What is the interval of years between each ashes seiries?

In every 2 years


What is the median interval for asymptomatic HIV to progress into symptomatic hiv?

Median interval would be approximately 3-8 years.