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Browsing by Author "Gericke, O.J."

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Are estimates of catchment response time inconsistent as used in current flood hydrology practice in South Africa?

Gericke, O.J.; Smithers, J.C. (Journal of the south african institution of civil engineering, 2016)

Catchment response time parameters are one of the primary inputs required when design floods, especially in ungauged catchments, need to be estimated. The time of concentration (TC) is the most frequently used time ...
Catchment parameter analysis in flood hydrology using GIS applications

Gericke, O.J.; du Plessis, J.A. (SAICE: Journal of the South African Institution of Civil Engineering, 2012-01)

The use of Geographical Information Systems (GIS) has permeated almost every field in the engineering, natural and social sciences, offering accurate, efficient, reproducible methods for collecting, viewing and analysing ...
Development of a customised design flood estimation tool to estimate floods in gauged and ungauged catchments

Gericke, O.J.; du Plessis, J.A. (AJOL: Water SA, 2013)

The estimation of design flood events, i.e., floods characterised by a specific magnitude-frequency relationship, at a particular site in a specific region is necessary for the planning, design and operation of hydraulic ...
Direct estimation of catchment response time parameters in medium to large catchments using observed streamflow data

Gericke, O.J.; Smithers, J.C. (Hydrological Processes: WILEY, 2015)

In single‐event deterministic design flood estimation methods, estimates of the peak discharge are based on a single and representative catchment response time parameter. In small catchments, a simplified convolution process ...
Disaggregation Of Fixed Time Interval Rainfall To Continuous Measured Rainfall For The Purpose Of Design Rainfall Estimation

Gericke, O.J.; Pietersen, J.P.J. (Water Research Commission, 2018-10)

Design rainfall estimates are primarily used in single-event deterministic design flood estimation methods where estimates of the peak discharge are based on the critical storm duration or time of concentration (TC) of a ...
Estimation Of Time Parameter Proportionality Ratios In Large Catchments: Case Study Of The Modder-Riet River Catchment, South Africa

Allnutt, C.E.; Gericke, O.J.; Pietersen, J.P.J. (Journal of Flood Risk Management Volume 13, Issue 3 e12628, 2020)

Catchment response time parameters, for example, the time of concentration (TC), lag time (TL), and time to peak (TP) are fundamental to event-based design flood estimation in ungauged catchments. Hydrological literature ...
Evaluation of critical storm duration rainfall estimates used in flood hydrology in South Africa

Gericke, O.J.; du Plessis, J.A. (Scielo: Water SA, 2011)

Design rainfall comprises of a depth and duration associated with a given probability of exceedance or return period. The purpose of the study was to evaluate and compare the methods used in flood hydrology to estimate ...
Evaluation of the standard design flood method in selected basins in South Africa

Gericke, O.J.; du Plessis, J.A. (SAICE: Journal of the South African Institution of Civil Engineering, 2012-01)

Design flood estimations display relatively wide confidence bands of uncertainty around all estimates of flood magnitude-frequency relationships. Taking cognisance of this, and the fact that most of the available design ...
An improved and consistent approach to estimate catchment response time parameters: case study in the C5 drainage region, South Africa

Gericke, O.J.; Smithers, J.C. (Journal of Flood Risk Management, 2018)

Large errors in estimates of peak discharge in medium to large catchments in South Africa can be largely ascribed to significant errors in the estimation of the catchment response time, mainly as a consequence of the use ...
Methodological Approach For The Compilation Of A Water Distribution Network Model Using QGIS And EPANET

Muller, A.L.; Gericke, O.J.; Pietersen, J.P.J. (Journal of the South African Institution of Civil Engineering Vol 62 No 4, December 2020, Pages 32–43, Paper 1023, 2020-12)

This paper presents the development of a methodological approach based on the integration of free-of-charge open-source software, e.g. QGIS and EPANET, and engineering practices applicable to water distribution network ...
Review of current methods for estimating areal reduction factors applied to South African design point rainfall and preliminary identification of new methods

Pietersen, J.P.J.; Gericke, O.J.; Smithers, J.C.; Woyessa, Y.E. (Journal of the South African Institution of Civil Engineering, 2015)

Design point rainfall estimates assume a uniform distribution of rainfall over a catchment, and hence are only representative for a limited area. For larger areas, areal reduction factors (ARFs) are used to convert design ...

Browsing by Author "Gericke, O.J."

Browsing by Author "Gericke, O.J."

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