Kobus Andries Du Plessis

Kobus Andries Du Plessis
Stellenbosch University | SUN · Department of Civil Engineering

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22
Publications
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181
Citations

Publications

Publications (22)
Article
This research investigated the impact of climate change on the Eerste River, which is the primary source of water for the Stellenbosch Municipality and the agricultural sector in the surrounding areas of Stellenbosch Town, South Africa. Climate data projected by 11 Global Circulation Models (GCMs) of the Coupled Model Intercomparison Project - Phas...
Article
The hydraulic design of structures depends on rainfall and runoff records to model and predict flood frequency for design purposes. The amount of runoff (and consequently flooding) from a catchment area has a direct relationship to the amount of rainfall in that catchment area, but as the point rainfall in any given area is likely to be more than t...
Article
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Climate change is a highly contentious topic in the modern world. There is much evidence to indicate that climatic shifts and extreme weather anomalies are taking place globally, in some places more than others. This paper presents the findings on research to determine whether shifts in seasonal rainfall patterns are indeed already visible in histo...
Article
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This paper addresses on-site supplementary household water sources with a focus on groundwater abstraction, rainwater harvesting and greywater reuse as available non-potable water sources to residential consumers. An end-use model is presented and used to assess the theoretical impact of household water sources on potable water demand in formal res...
Article
Please refer to full text for abstract Thesis (PhD (Public Management and Planning))--University of Stellenbosch, 2010.
Article
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Extreme storms in South Africa and specifically in the Western Cape have been responsible for widespread destruction to property and infrastructure, even leading to displacement and death. The occurrences of these storms have been increasingly linked to human-induced climate change that is expected to cause more variable weather. Studies on climate...
Article
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In October 2004 the City of Cape Town implemented water restrictions in line with the city's holistic approach to water demand management. To better understand the savings and improve the effectiveness of future restrictions, a detailed demand analysis was conducted during this period. In this paper the authors report on various aspects pertaining...
Article
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South Africa is facing serious water shortages within the next 25 years and effective water demand management forms an integrated part of the possible solution. Municipalities are responsible for the majority of the water supply functions in South Africa, but they are challenged by limited funding opportunities and a lack of capacity. Water demand...
Article
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Water Conservation and Water Demand Management (WC/WDM) forms part of integrated water resource management and can be used as an economically viable alternative to the upgrade of infrastructure to balance supply and demand. In order to enable effective decision-making, a model was developed in this study to estimate expected water savings and the f...
Article
Full-text available
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 structures. Both the occurrence and frequency of flood events, along with the uncertainty involved in the estimation thereof, con...
Article
While agricultural producers on commercially operated irrigation schemes will aim to achieve the recommended high crop yields, those on a smallholder irrigation scheme usually produce moderate to low crop yields. The water demand by these two irrigator types also differs and is reflected in the variations in crop yields. Because smallholder irrigat...
Article
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This article describes research that compares actual water transfers of an inter-basin transfer (IBT) scheme with its original, appraisal stage, prediction. Transfers are shown to be significantly less and also more variable than predicted. Further research reveals that the state of the receiving system has a large bearing on year-to-year decisions...
Article
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Unit Reference Value (URV) is a common measure in South Africa to assess the economic efficiency of proposed water projects. This is a companion article to an earlier one establishing that the current approach of appraisal of inter-basin water transfer projects (IBTs) with significant pumping costs overestimates likely future water transfers and th...
Article
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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 depth-duration-frequency (DDF) relationships of design rainfall in South Africa based on the critical storm duration or time of con...
Technical Report
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Background Water resource managers, water demand managers and water infrastructure planners alike, are faced with an acute lack of knowledge regarding on-site household water use as additional water source to potable Municipal supply. The most common on-site household water sources (HWS) of this nature include:  groundwater abstraction by means of...
Article
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The effective management of groundwater resources is a critical aspect to ensure sustainability. The paper discusses the structures used to ensure effective monitoring at a local government level, and focuses specifically on the process followed and the critical monitoring factors identified to ensure sustainability. The paper highlights specific p...
Article
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With municipalities constantly under pressure due to staff shortages, the need for benchmarks to assist them with the planning process of their water infrastructure becomes an important tool to ensure effective water management. The lack of available and trustworthy data plays an important role. The use of the data provided in the Water Service Dev...
Article
Full-text available
The climate of the world varies from one decade to another, and a changing climate is natural and expected. The rapid human industrial development experienced since the early 1800s, may well have caused variations that exceed natural cyclic changes. Climate change can be defined as the natural cycle through which the earth and its atmosphere are go...
Article
Full-text available
Municipalities need to develop Water Services Development Plans (WSDPs) as a first requirement in their budgetary process, and need to be made aware of the options that are available to provide more than basic services. While 25ℓ/person·d has been set as the minimum basic water supply and while many consumers receive far in excess of this amount, t...

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Project (1)
Project
The primary objective of this project is to develop a regionalised approach to estimate areal reduction factors and catchment response time parameters for improved design flood estimation at medium to large catchment scales in South Africa using the pilot scale studies of Pietersen (2016) and Gericke and Smithers (2016b; 2017) as guiding reference.