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PMP(Probable maximum precipitation) - Hershfield method

작성자 Uploader : ezcivil 작성일 Upload Date: 2016-05-14변경일 Update Date: 2016-05-14조회수 View : 766

Statistical procedures for estimating PMP may be used wherever sufficient precipitation data are available, and are particularly useful for making quick estimates, or where other meteorological data, such as dew point and wind records, are lacking.
The procedure as developed by Hershfield [1961] and later modified [1965] is based on the
general frequency equation.

PMP = (Xn + KmSn)*AF
Xn : Adjusted means (Xn) for maximum observed amount and record length (mm)
Km : Number of standard deviations to be added to Xn to obtain PMP
Sn : Adjusted standard deviations for maximum observed amount and record length (mm)
AF : Adjustment factor for fixed interval precipitation amounts for number of observational units within the interval[Weiss,1964] (1h : 1.13, 6h : 1.02, 24hr : 1.01)

*** 참고문헌[References] ***

WMO, MANUAL FOR ESTIMATION OF PROBABLE MAXIMUM PRECIPITATION, 2nd edition, p96-p108.
PMP = (Xn + Km*Sn)*AF
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변수명 Variable 변수값 Value 변 수 설 명 Description of the variable


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