design rainfall estimation in south africa software download

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Units by clicking on the appropriate link below. A short summary of this paper.

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Finally the design peak storm water runoff rate is calculated using the Rational Method equation Q CiA.

. ABSTRACT The objective of the study was to update and improve the reliability and accuracy of short duration 24 h design rainfall values for South AfricaThese 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. Mo st of the method s used for design flood estimation in South Africa were developed in the late 1960s and early 1970s and are in need of updating with more than 40 years of additional data. Civil in the Department of Civil Engineering of the Faculty of Engineering and Information Technology of the.

Shor t duration. This paper reviews methods for estimating design rainfalls particularly extreme events in South Africa and internationally and highlights the need to update methods used for estimating extreme rainfall events in South Africa as a platform for future research. Should you want to order.

In South Africa outdated methods are widely applied for DFE. The mean of the Annual Maximum Series AMS was. Figure 2 Distribution of 78 clusters of relatively homogeneous extreme daily rainfall in South Africa Smithers and Schulze 2000b For each cluster and for all durations 5 minutes to 7 days and return periods 2 to 200 years considered a growth curve relating the scaled design rainfall depth to return period was developed.

Studies in South Africa which hav e estimated design rainfalls for durations of 1 day and longer include SAWB 1956 Schulz e. In this paper the potential of a 4 PDF A new magnitude category disaggregation approach for temporal highresolution rainfall intensities M. Estimates of design rainfall for durations shorter than one day were last comprehensively produced for south africa in the late 1970s and early 1980s using values manually extracted from autographic rainfall charts midgley and pitman 1978 van heerden 1978 adamson 1981 and in the mid 1980s using digitised data for selected stations in the.

The main aims of this study are i to estimate extreme design rainfall values with a focus on return peri-ods greater than 200 years. Then the design rainfall intensity is calculated with the equation i a d b using the calculated values for a and b. 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.

Relatively few recording raingauges with long reliable records are available in South Africa for the estimation of short duration 24 h design rainfallsHence approaches to estimating short duration design rainfalls have been developed for South Africa which are based on daily rainfall data measured by standard non-recording raingauges at fixed 24 h periods ending at 0800. Units or for SI. Schulze Published 28 February 2002 Environmental Science Journal of Hydrology View via Publisher Save to Library Create Alert Rainfall Modelling Using Bartlett Lewis Rectangular Pulse Models.

Downloads Metrics PDF views 240 3 Downloads PDF Published 2019-07-31 How to Cite. PMP particularly as used for the design and safety evaluation of large dams in South Africa is being challenged with the recommendation that high return period design rainfalls be used in these assessments. Estimation of 1 to 7 day design rainfall for South Africa was adopted in this study.

Long Duration Design Rainfall Estimates for South Africa. Rode Environmental Science 2015. Accurate estimates of design rainfall are essential inputs in water resource planning and engineering design.

Design rainfall estimation in South Africa using BartlettLewis rectangular pulse rainfall models J. This spreadsheet can be downloaded for US. 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.

A user manual for the free software that will be made available at the course is available upon request at an additional cost of R40000. FOR DESIGN RAINFALL ESTIMATION IN THE C5 SECONDARY DRAINAGE REGION OF SOUTH AFRICA by JACOBUS PETRUS JOHANNES PIETERSEN A dissertation submitted in fulfilment of the requirements for the degree Magister Technologiae Engineering. 11h30 Design Rainfall Estimation in South Africa J Smithers UKZN 12h30 Lunch 12h30 - 13h15 13h15 Areal Reduction Factors JA du Plessis US 14h15.

However unlil recently there has been very little consensus regarding the best. 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. Design flood estimation DFE is essential in the planning and design of hydraulic structures.

Full PDF Package Download Full PDF Package. 681100 water research commission pretoria. These approaches include the use of regional frequency analyses scaling the moments of the extreme events and stochastic modelling of the rainfall process smithers and schulze development and evaluation of techniques for estimating short duration design rainfall in south africa wrc report no.

Regional approaches are not new in frequency analysis with many different techniques available. Design rainfall and flood estimation in South Africa.

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