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26 April 2022 | Story Dr Qinisani Qwabe
Dr Qinisani Qwabe
Dr Qinisani Qwabe

South Africa recently witnessed a catastrophic natural disaster that resulted in the loss of life, livelihoods, and infrastructural damage. This occurred in KwaZulu-Natal where hundreds of people lost their lives as a result of extensive flooding and mudslides. President Cyril Ramaphosa declared a national state of disaster to which we should all respond. Specific reference was made to the public and private sectors, as well as civil society.

While I applaud the various stakeholders that have extended a helping hand, my heart bleeds for the vulnerable groups whose voices remain unheard, even under normal circumstances. One cannot help but wonder if aid will reach the isolated regions that suffered the adverse effects of these heavy rains, or if all developmental efforts will be prioritised to certain economic hubs of the province such as the eThekwini Metro and the capital, uMgungundlovu.

KwaZulu-Natal is among the poorest provinces in the country. Corroborating this claim is a report that was released by Statistics South Africa earlier this year which reveals that about 52% of the province’s population are considered to be ‘poor’,and live at the lower end of the poverty line.

Drawing from my experiences of the rural communities of KwaZulu-Natal with whom I have worked, many suffer from the triple challenge of poverty, inequality, and unemployment, and rely on agriculture for their livelihood and to put food on the table. Their supplementary income is obtained from government support grants. The graphic scenes that have been shown on the media illustrate the devastating effects of the heavy rains in regions within the agricultural sector. Fields have been washed away, crops and livestock have been lost. This is happening when the province is still trying to resuscitate its economy after the widespread looting that took place in July last year, which had a calamitous effect on businesses and livelihoods.

While this is an injury mainly for the people of KwaZulu-Natal, it is my wish that we all join hands in contributing towards the restoration of livelihoods. In agreement with the president’s assertion, we can all play a part in rebuilding the province. This includes institutions of higher learning, particularly the Community Engagement Directorates whose mandate is to drive socioeconomic development to external communities.

Related article:
Opinion: KZN floods expose significant socio-economic and environmental vulnerabilities

KZN FLOODS

News Archive

Research helps farmers save with irrigation
2017-02-15

Description: Irrigation research Tags: Irrigation research

Marcill Venter, lecturer in the Department of
Agricultural Economics at the University of the
Free State, has developed the mathematical
programming system, Soil Water Irrigation
Planning and Energy Management in order to
determine irrigation pump hours.
Photo: Rulanzen Martin

Her advice to farmers is that they should make sure they are aware of the total cost (investment and operating costs) of an irrigation system. In most cases the investment cost is low, but the operating cost over the lifetime of the system is high.

“It is very important to have a look at the total cost and to install the most economic system,” says Marcill Venter, lecturer at the University of the Free State (UFS), who has done research on the economic sustainability of water-pipe systems.

Irrigation systems important components for farming
This research comes at a time when many farmers are relying on their irrigation systems due to persistent drought and low rainfall during 2016. South Africa has also experienced an abnormal increase in electricity tariffs in recent years. Due to tariff increases which threaten the future profitability of irrigation producers, the Water Research Commission (WRC) has launched and financed a project on the sustainable management of irrigation farming systems. “I had the opportunity to work on the project as a researcher,” says Venter.

The heart of every irrigation system is the water pipes that bring life to crops and livestock, and this is what Venter’s research is about. “Water pipes are part of the whole design of irrigation systems. The design of the system impact certain factors which determine the investment and operating costs,” she says.

Mathematical system to help farmers
Venter and Professor Bennie Grové, also from the Department of Agricultural Economics at the UFS, designed the Soil Water Irrigation Planning and Energy Management (SWIP-E) programming model as part of the WRC’s project, as well as for her master’s degree. “The model determines irrigation pump hours through a daily groundwater budget, while also taking into account the time-of-use electricity tariff structure and change in kilowatt requirements arising from the main-line design,” says Venter. The model is a non-linear programming model programmed in General Algebraic Modeling System (GAMS).

Design of irrigation system important for sustainability

The main outcome of the study is that the time-of-use electricity tariff structure (Ruraflex) is always more profitable than the flat-rate structure (Landrate). The interaction between the management and design of a system is crucial, as it determines the investment and operating costs. Irrigation designers should take the investment and operating cost of a system into account during the design process. The standards set by the South African Irrigation Institute (SAII) should also be controlled and revised.

Water-pipe thickness plays major role in cost cuts
There is interaction between water-pipe thickness, investment and operating costs. When thinner water pipes are installed, it increases the friction in the system as well as the kilowatt usage. A high kilowatt increases the operating cost, but the use of thinner water pipes lowers the investment cost. Thicker water pipes therefore lower the friction and the kilowatt requirements, which leads to lower operating costs, but thicker pipes have a higher investment cost. “It is thus crucial to look at the total cost (operating and investment cost) when investing in a new system. Farmers should invest in the system with the lowest total cost,” says Venter.

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