Lecture 25

Lecture 25 - Water Resources R s urc s Engineering E g g -...

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Water s urc s Resources Engineering repared by T Wagener & P Reed - Lecture 25 1 Prepared by T. Wagener & P. Reed Penn State University
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ontent Content ata Analysis 1. Data Analysis 2. Probability Concepts 3. Commonly Used Probability Distributions 4. Hydrologic Design for Water Excess Management 5. Hydrologic/Flood Frequency Analysis 2
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Flood Frequency Analysis 3
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eview Review ccording to the .S. Water Advisory According to the U.S. Water Advisory Committee on Water Data (1982), the Log- Pearson Type III Distribution is the recommended technique for flood frequency analysis in order to promote a consistent approach. For this distribution the inverse function form is not readily available, so we use a frequency factor approach. 4
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or Log- earson Type III Distribution For Log Pearson Type III Distribution log ( , ) Ts y Qy K T G S = +⋅ here Q the flood discharge value of some specified where Q T is the flood discharge value of some specified probability, y is the average of the log Q discharge values, K is a frequency factor, and S y is the standard eviation of the log Q values. deviation of the log Q values. The frequency factor K is a function of the skewness coefficient G S and return period T and can be found sing the equency factor table ollowing slides) 5 using the frequency factor table (following slides).
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he Problem with Skew The Problem with Skew he kew coefficient very sensitive to the The skew coefficient is very sensitive to the size of the sample; thus, it is difficult to btain an accurate estimate from small obtain an accurate estimate from small samples.
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This note was uploaded on 04/11/2008 for the course C E 341 taught by Professor Scanlon,andrew during the Spring '07 term at Penn State.

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Lecture 25 - Water Resources R s urc s Engineering E g g -...

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