Harvesting hope: Water and rivers powering the Limpopo potato heartland

Estimated reading time: 3 minutes

Potato producers across Limpopo depend on four key rivers for irrigation. These are the Limpopo, Mogalakwena, Palala, and Mogol rivers. These waterways, together with their associated dams, continue to support the region’s thriving potato industry even after seasonal challenges.

January floods

In early January, the Limpopo province experienced intense, sustained rainfall, triggered by a series of frontal systems that were exacerbated by tropical influences. The South African Weather Service issued red and orange warnings between 7 and 25 January, especially across the northern parts of Limpopo and Mpumalanga.

Potato producers across Limpopo felt the ripple effects as floodwaters temporarily submerged irrigation canals, damaged pump infrastructure, and caused sediment buildup especially along riverbank fields near the Limpopo and Mogalakwena Rivers.

Mogol River

While less widely studied, this river supports local irrigation and crosses sensitive informal settlement areas. The Mogol River bridge near Mamojela Park was at risk of flooding during the same January rains that affected the Palala, although no lasting damage to irrigation infrastructure was reported. This river’s flow has normalised after flood peaks, and irrigation remains feasible for nearby potato producers.

Limpopo River

This major river has a naturally sluggish, silt-rich flow. In drought years, upper stretches may flow for just over a month, but overall it remains a critical water source for irrigation.

In July, portions of the river turned a strange turquoise green and emitted a chemical-like odour, prompting concern. However, laboratory tests confirmed the issue was an algae bloom, not industrial pollution, and the water was declared safe for farming and community use. Local authorities continue weekly testing to ensure safety.

The recent bloom in the Limpopo River is a symptom of nutrient enrichment, which is common during warmer months, especially with runoff from agricultural or faulty sewage systems. These cyanobacterial blooms can temporarily colour the water and cause odour concerns; however, periodic testing ensures producer confidence and safe use. Authorities continue weekly monitoring in affected zones, including Musina and downstream communities, to guard both agriculture and public health.

Mogalakwena River

As a major tributary of the Limpopo River, the Mogalakwena flows through the Waterberg region. This basin is known for a five-year rainfall cycle with alternating wet and dry phases. During dry years, stretches may run almost dry, only to revive during rainy seasons.

Following sufficient rainfall early this year, river flow has improved while dam levels such as those in the Glen Alpine Dam that provides irrigation water, remain full and stable, supporting local potato farms. The cycle has shifted to a more favourable phase for sustained irrigation.

Palala River

Also known as the Lephalala River, this tributary emerges in the Waterberg plateau and typically carries high-quality, clean, fresh water through sandstone catchments, making it well suited for irrigation. In mid January heavy rains caused the river to overflow dangerously, flooding surrounding communities and even resulting in drownings near Ga-Seleka. Since then, the flow has settled to safe levels and it remains a reliable source of water for producers.

Be it the Limpopo with its occasional algae bloom, the oscillating Mogalakwena flow, or the Palala and Mogol that faced brief flood hazards, farm water supplies have remained largely intact and predictable. This affords the region’s potato producers peace of mind as they look ahead to the next planting cycle. – Ané du Plessis, Potatoes SA

For more information, send an email to ane@potatoes.co.za