design rainfall estimation in south africa software download

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In South Africa the estimation of ARFs is limited to the storm-centred approaches of Van Wyk 16 and Wiederhold 17 while Alexander 18 also developed a. 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.

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. 11h30 Design Rainfall Estimation in South Africa J Smithers UKZN 12h30 Lunch 12h30 - 13h15 13h15 Areal Reduction Factors JA du Plessis US 14h15. South Africa which is suitable for application in. In South Africa numerous regional- and national-scale studies have focused on design rainfall estimations for daily and sub-daily durations.

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. 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. Most of the methods used for design flood estimation in South Africa were developed in the late 1960s and.

Schulze et al 1992. 11h30 Design Rainfall Estimation in South Africa J Smithers UKZN 12h30 Lunch 12h30 - 13h15 13h15 Areal Reduction Factors JA du Plessis US 14h15 Graphical Representation and Numerical description of data and Data acquisition and Information. 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.

Accurate estimates of design rainfall are essential inputs in water resource planning and engineering design. A short summary of this paper. 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.

New approaches to estimating extreme rainfall events are being developed internationally. Correct areal design rainfall estimates since it is assumed that the AEP of both the point and areal design rainfall is similar 4. The estimation of design rainfalls is necessary to estimate the exceedance probabilities of extreme floods required to design hydraulic structures and to quantify the risk of failure of these structures.

Long Duration Design Rainfall Estimates for South Africa. Homogeneous rainfall regions in South Africa were identified using daily rainfall data from I 789 stations which have at least 40 years of record. Software to implement design flood procedures currently used in South Africa has been developed eg.

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. Relatively few recording raingauges with long reliable records are available in South Africa for the estimation of short duration 24 h design rainfalls. 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.

Ordinary kriging is. Flood Design Software ExcelExcelExcel----based based based. Design rainfall and flood estimation in South Africa.

Smithers and Geoffrey G. Observed streamflow data. Should you want to order.

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. Download full-text PDF Read full-text. Q is the peak storm water runoff rate from the.

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 rainfall estimation in South Africa using BartlettLewis rectangular pulse rainfall models. This paper reviews methods for estimating design rainfalls.

In South Africa as in many countries the spatial density and record lengths of rainfall measured manually at. RLMASI design rainfall software 11 12. In this study a regionaliscd index storm based frequency analysis using 1-moments was adopted for design rainfall estimation.

C is the runoff coefficient for that drainage area that is the fraction of rainfall on the drainage area that becomes storm water runoff. Design flood estimation in South Africa are based on empirical deterministic and probabilistic approaches Pegram and Parak. Relatively few recording raingauges with long reliable records are available in South Africa for the estimation of short duration 24h design rainf.

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. Journal of Hydrology 2002. Hence 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.

The HRU 1972 outlines a deterministic Rational Method approach to design flood estimation in. Schulze 1998 to estimate short duration design rainfall in 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.

A is the area that drains to the design point of interest the drainage area in acres for SI units. I is the design rainfall intensity in incheshr for SI units. It is postulated that the stochastic modelling of rainfall based approach to the estimation short duration design rainfall in South Africa can in conjunction with regional and scaling based approaches overcome the limitations of the short duration rainfall database in South Africa and result in robust and reliable estimates of short duration.

In South Africa as in many. Design rainfall estimation in South Africa using BartlettLewis rectangular pulse rainfall models articleSmithers2002DesignRE titleDesign rainfall estimation in South Africa using BartlettLewis rectangular pulse rainfall models authorJ. 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.

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