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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 else can I help you with?
How can one calculate the flood recurrence interval?
To calculate the flood recurrence interval, you can use the formula T (N1) / M, where T is the recurrence interval, N is the number of years of record, and M is the rank of the flood event. This formula helps estimate how often a flood of a certain magnitude is likely to occur based on historical data.
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.
How do you use recurrence in a sentence?
(Recurrence simply means a repeated occurrence, or repetition.)"In the experiment, they noticed a recurrence of the same unexplained effect."The doctor ordered more tests for the patient after the recurrence of her symptoms."
How do you Solve recurrence equations?
A recurrence system can be solved by finding and solving its closed form. A closed form is easily found for simple arithmetic or geometric recurrence systems, but may be hard to find for recurrence systems of a more complex nature. In this case, the recurrence system can be solved recursively.
When was Relentless Recurrence created?
Relentless Recurrence was created on 2007-06-26.
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.
How are the terms remission and recurrence related in regards to cancer?
Remission is when cancer signs disappear, Recurrence is the return of cancer after a remission.
What patients are most susceptible to a recurrence of Mallory-Weiss Syndrome?
Patients at highest risk for a recurrence of bleeding are those with portal hypertension.
What actors and actresses appeared in The Recurrence - 2003?
The cast of The Recurrence - 2003 includes: Dennis Adler as David Konstantin Adler as Killian
What are 3 interval choices in army formations?
normal interval, close interval, and double interval
When you form the squad you must ensure that the squad is at the correct interval What is one of your three interval choices?
The three interval choices are normal interval, close interval and double interval. When forming a squad these are the choices to ensure they are at the correct interval.
What are the chances for recurrence of a cancerous tumor following a pancreatectomy?
The risk for tumor recurrence is thought to be unaffected by whether the patient undergoes a total pancreatectomy or a pancreaticoduodenectomy.
