Long Duration Design Rainfall Estimates for South Africa. Long duration design rainfall estimates for south africa.
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Since this study was completed over a decade of additional rainfall data are available to update design rainfall estimates.
. Ver 3 July 2012 User selection has the following criteria. In this study the scaling characteristics of extreme rainfall and a regional approach based largely on the more reliable and abundant daily rainfall data are utilised to estimate design rainfalls in South Africa for durations ranging from 5 min to 7 d. 11h30 Design Rainfall Estimation in South Africa J Smithers UKZN 12h30 Lunch 12h30 - 13h15 13h15 Areal Reduction Factors JA du Plessis US 14h15.
Free State South Africa 2Department of Civil Engineering University of Stellenbosch PBag X1 Matieland 7602 South Africa Abstract The estimation of design flood events ie floods characterised by a specific magnitude-frequency relationship at a particu-. 0 minutes Data extracted from Daily Rainfall Estimate Database File The station selected and the five closest stations are listed. Size of a 24-hour winter rainfall event associated with a 2 chance of being exceeded for an area in the Western Cape South Africa.
In the regional frequency analyses 15 relatively homogeneous rainfall clusters w. Design rainfalls in South Africa for durations of 1 day and longer were last computed using a single station approach in the early 1980s. Katelyn Johnson School Of Engineering University Of Kwa Z ulu-Natal Supervisor.
Estimation of Extreme Design Rainfall Events and Accounting for Non-stationary Data in Design Rainfall Estimation in South Africa. The most recent South African method for design rainfall estimation for short and long durations was developed by Smithers and Schulze 2003 which provides estimates for return periods ranging from 2 to 200 years. Design Flood Estimation DFE and other hydrological modelling methods are used to limit the risk of failure and ensure the safe design of infrastructure and for the planning and management of water resources.
Full PDF Package Download Full PDF Package. Design rainfall South Africa Regionalisation Scaling Extreme rainfall. The duration of design rainfall which is required for design flood estimation may range from as short as 5 min for small urban catchments which have a rapid hydrological response to a few days for large regional scale flood studies.
The temporal distribution of rainfall has a significant impact on the magnitude and timing of flood peak discharges. And the third approach used a stochastic intra-daily model to generate synthetic rainfall series. Currently longer periods of data are now available for analysis.
The point process approach to extreme value theory is employed to quantify the 50-year winter rainfall return level estimate from daily rainfall data from fifteen stations in the Western Cape. Most of the methods used for design flood estimation in South Africa were developed in the late 1960s and early 1970s as summarised in HRU 1972 and are in need of updating with more than 40 years of additional data currently available Van der Spuy and Rademeyer 2010 and with new approaches used internationally Smithers and Schulze 2003. Physics and Chemistry of the Earth Parts ABC 2005.
Accurate estimates of design rainfall are essential input in the design of hydraulic structures. Ordinary kriging is. The objective of the study was to update and improve the reliability and accuracy of short duration s 24 h design rainfall values for South Africa.
Design Rainfall in South Africa. Academiaedu uses cookies to personalize content tailor ads and improve the user experience. Design rainfall and flood estimation in South Africa.
2 yr 5 yr Block Size requested. A number of such approaches to disaggregate daily rainfall into sub-daily hyetographs have been developed and applied in South Africa. Moreover techniques for estimating design values using a regional approach which.
Climate Prediction Center CPC Rainfall Estimator RFE for Africa As of January 1 2001 RFE version 20 has been implemented by NOAAs Climate Prediction Center. By using our site you agree to our collection of information through the use of cookies. Accurate estimates of design rainfall are essential inputs in water resource planning and engineering design.
Created by Ping-Ping Xie this replaces RFE 10 the previous rainfall estimation algorithm that was operational from 1995 through 2000 Herman et al 1997. 5 m 10 m 15 m 1 d Return Periods requested. Relatively few recording raingauges with long reliable records are available in South Africa for the estimation of short duration 24h design rainf.
Rainfall Temporal Disaggregation RTD techniques can be used to produce finer resolution data from coarser resolution data. In South Africa as in many. Preliminary investigations in the Thukela catchment.
These were to be based on digitised rainfall data whereas previous studies conducted on a national scale in South Africa were based on data that were manually extracted from autographic charts. Continuous simulation modelling for design flood estimation in South Africa. A user manual for the free software that will be made available at the course is available upon request at.
Africa is relatively scarce compared to those which provide daily data.
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