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n=total number of observations

n=total number of observations. Probability of exceeding per day Return Period = 1/Probability [units inverse of time basis for probability]. Low flow statistics often reported as 7Q2= 7 day low flow w/ 2 year recurrence interval 7Q10=7 day low flow w/ 10 year recurrence interval

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n=total number of observations

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  1. n=total number of observations Probability of exceeding per day Return Period = 1/Probability [units inverse of time basis for probability]

  2. Low flow statistics often reported as 7Q2= 7 day low flow w/ 2 year recurrence interval 7Q10=7 day low flow w/ 10 year recurrence interval 30Q10=30 day low flow w/ 10 year recurrence interval

  3. Probability that a flow with a certain recurrence interval (t) will occur once in a given time interval (n) P=1-(1-(1/t))n Probability that a storm with a 3 year recurrence interval will occur once in 7 days Recurrence interval=3 years = 1095 days P=1-(1-(1/1095))7=0.0063

  4. What can you infer about the hydrogeology from the different discharge probability plots?

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