Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
20 December 2022 | Story Gerda-Marié van Rooyen | Photo Supplied
Crystal-Donna Roberts
Crystal-Donna Roberts is a multifaceted lady. She appears regularly in soaps and is now a published author too. Speurder Sammi, an Afrikaans book written for early teens, explores themes such as anxiety, trauma, and pain.

She loved mysteries from a young age. Growing up, Crystal- Donna Roberts was fond of Columbo and Murder she wrote. Roberts, who graduated with a BA Drama and Theatre Arts in 2005, says she had always liked the tricky puzzles Scooby-Doo and Nancy Drew had to solve. She eagerly joined them on their missions page by page. Being an actress and having a busy schedule in front of cameras, Roberts actively decided to put time aside last year to write while participating in the Jakes Gerwel mentorship programme for upcoming authors. A lifelong dream came true when she wrote her debut novel, Speurder Sammi: Die blou steen (Detective Sammi: The blue stone). Tafelberg published her mystery-based story, which Roberts launched in September.

“Sammi is a teenager who lives with her artist aunt Valerie. The duo went on holiday visiting Oumie and Dedda in the Northern Cape. Although Sammi will miss her friends, April and Lerato, she is looking forward to a change of scenery. It will also distract her mind from the anticipation of waiting for acceptance at an art school she fancies. However, rural towns are full of surprises – and chancers.”

“There are teenage memories we seldom forget. The memory of growing pains is still vivid in my mind. I recall it and draw inspiration from it.”

Roberts doesn’t have set rituals when she writes. “I allow myself to do what my body and soul likes. Sometimes this means simply sitting down and enjoying a cup of tea.” Looking back on her fellowship, she discovered her love for creating new worlds and allowing the story to develop a storyline of its own. “I’ve learned I still have a lot to learn – this excites me. I also learned the importance of deadlines, even though they are scary.”

The former UFS student says she chose the Northern Cape as the setting for her story as it is one of the most beautiful parts of our country. “It is one of the prettiest parts of our country. I wanted my character to explore new horizons, but to remain between her loved ones when she goes through her healing and strengthening process.” Although Roberts is determined to write her second book, the details are still unknown. In the meantime, she enjoys reading Walter Russel’s The Secret of Light. She draws inspiration from Andrew Davidson’s The Gargoyle. “Apart from the story that deeply resonates with me, I can appreciate the detail in the story and Davidson’s writing style.”

To enquire about stockists selling Speurder Sammi, visit www.nb.co.za.


Presenter and television, theatre and film actress, Roberts is currently starring in kykNET’s drama series, Fraksie. She is also known for her roles in 7de Laan, Getroud Met Rugby, Montana, Vallei van Sluiers, Krotoa, and The Endless River.

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.

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept