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Principled, Pragmatic revitalisation of catchment management forums in South Africa
Expanded Title:Many thousands of engineering and conservation design decisions, contributing multi-millions of rands to construction, are made annually in South Africa. These require accurate short-duration design rainfall intensity information. Databases used in arriving at current depth-duration-frequency estimates only extend to the 1970s and were derived from manually extracted rainfall increments at 15, 30, 45 and 60 min intervals. This project processed all available digitised rainfall data up to 1996. An analysis of 412 stations showed that only 12 had record lengths of more than 40 years. This is particularly pertinent in estimating design events with return periods of 50 to 100 years. Data analysis also led to the disappointing conclusion that the digitised data were generally not adequate for directly estimating design storms for durations lower than 24 h. Instead the research developed indirect methods that use regional similarities and scaling properties of extreme events as well as stochastic simulation of rainfall series. For this, 15 relatively homogenous regions in South Africa were defined.
Date Published:01/09/2016
Document Type:Research Report
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 682/16
ISBN No:978-1-4312-0831-9
Authors:Munnik V ; Burt J; Price L; Ashe B; Motloung S
Project No:K5/2411
Originator:WRC
Organizations:North West University; Rhodes University
Document Size:3 027 KB
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