Probable maximum precipitation estimation using Hershfield’s statistical method: a case of Dedessa sub-basin, Ethiopia

2021 ◽  
Author(s):  
Nigatu Nura Daba ◽  
Tamene Adugna Demissie ◽  
Chala Hailu Sime
Keyword(s):  
Statistical Method ◽  
Probable Maximum Precipitation ◽  
Maximum Precipitation ◽  
Precipitation Estimation

scholarly journals Estimating Probable Maximum Precipitation for Linau River Basin in Sarawak

2014 ◽  
Vol 5 (3) ◽  
pp. 1-5
Author(s):  
M. Hussain ◽  
S. Nadya ◽  
F.J. Chia
Keyword(s):  
Statistical Method ◽  
River Basin ◽  
Public Safety ◽  
Geographical Location ◽  
Hydraulic Modeling ◽  
Rain Gauge ◽  
Data Set ◽  
Probable Maximum Precipitation ◽  
Maximum Precipitation ◽  
The Impact

 The probable maximum precipitation (PMP) is the greatest depth of precipitation for a given duration that is physically possible over a given size storm area at a particular geographical location at a certain time of the year. PMP is very important to be considered for the design of river regulating structures i.e Dams and Barrages to overcome any possible chance of overtopping failure as well as for public safety and hazards downstream of any of these structures. Especially if these structures located in the upstream of the of the populated town or city than the failure could damage severely such areas. As such the PMP convention is always a requirement as primary design dam/reservoir criteria when public safety is of concern. The PMP is used to derive Probable Maximum Flood (PMF), which further used in hydraulic modeling to check the impact assessments for such occasions. This paper focuses on estimation of PMP for Linau River Basin in Sarawak using statistical method proposed by World Meteorological Organization (WMO), which is described in its operational manual. Long Lidam and Long Laku are located in Linau River Basin but Long Laku has long discontinuity in the data set thus the rainfall series at Long Lidam is further used for PMP estimation. The missing data was in-filled using Belaga rain gauge station as Long Lidam rainfall has good correlation with Belaga rainfall data. Hershfield statistical method has been adopted to estimate the 24-hour duration PMP. The Probable Maximum Precipitation for 24-hour duration storm is estimated as 691 mm for the Linau River Basin.

scholarly journals Probable Maximum Precipitation Estimation in a Humid Climate

2018 ◽  
Author(s):  
Zahra Afzali Gorouh ◽  
Bahram Bakhtiari ◽  
Kourosh Qaderi
Keyword(s):  
Physical Method ◽  
Hydraulic Structures ◽  
Humid Climate ◽  
Probable Maximum Precipitation ◽  
Maximum Precipitation ◽  
Java Programming ◽  
Precipitation Estimation ◽  
Water Resources Projects ◽  
User Friendly ◽  
Convergence Model

Abstract. Due to the importance of probable maximum precipitation (PMP) for designing and planning hydraulic structures, the aim of this study is the estimation of 24-hour PMP (PMP24) by using the statistical and physical methods in a humid climate of Qareh-Su Basin which is located in the northern part of Iran. For statistical estimate of PMP, the equations of empirical curves of Hershfield method were extracted. Then the standard and revised approaches of Hershfield method were written in JAVA programming language, as a user friendly and multi-platform application called the PMP Calculator. Convergence model was considered to calculate PMP by physical method. The depth–area–duration (DAD) curves were extracted to estimate PMP24 using physical method and then PMP24 was estimated for each storm. The results showed that for the standard and revised approaches, Km was found to be varied the range of 17–18.0 and 2.2–5.3, respectively. The maximum values of PMP24 for the first approach was obtained 447.7 mm and for second approach was 200.7 mm. Using the physical method, PMP24 was 143.1 mm. The results of this study will be helpful for planning, designing, and management of hydraulic structures and water resources projects in the study area.

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