Story by Fungai Jachi
AS Zimbabwe accelerates investment in rural infrastructure to boost development and strengthen food security, the Semwa Dam project in Rushinga has emerged as a model of engineering precision and local craftsmanship.
Currently in the dental concreting phase, the massive dam, designed as a roller-compacted gravity structure embodies durability, efficiency, and cutting-edge hydraulic performance.
Engineers on site describe the project as a testament to Zimbabwean technical expertise, with every block laid and every beam lifted reflecting a blend of innovation, skill, and national pride.
“The local villages and the local primary schools will be able to get potable water from this system. So, Semwa Dam is a roller-compacted dam. It is a gravity dam, which I think is the second, a futuristic design. The dam can actually import water during construction. As the construction needs are growing, we can actually have this water even during construction, so that we can divert the water to other places for use. We can even start to send water for irrigation while the dam is still under construction.
“At the same time, it’s a major benefit because the area requires several roads, which we are planning to construct as we construct the dam. On average, we are producing around 1 200 acres a week from the local rocks that we are blasting here. We are also harvesting river sand. The river sand that we are taking is from the Madike River, which supplies water to the main river, Luya, which is the one we are using to make the dam. At the same time, we are desalting the smaller river because the material is cold,” ZINWA Engineer, Francis Dzenga said.
The Semwa Dam is distinguished by its integrated resource model, where local geology becomes part of the construction fabric. The stones, sand, and aggregates used are all locally sourced, reducing transport costs, cutting the project’s carbon footprint, and empowering local communities.
“We have made significant progress in structural works, working closely with local artisans. All aggregate and cement batching is done on site, and steel reinforcement is sourced from Manhize, making this truly a Zimbabwean-engineered project,” Makomo Holdings contractor, Key Guangchow Chen noted.
The design incorporates mechanical stabilisation, aggregate interlock, and seepage control systems, ensuring long-term resilience and operational safety under diverse hydrological conditions.
The Semwa Dam is expected to play a central role in improving water access for irrigation, agriculture, and domestic use, contributing to Zimbabwe’s broader agenda of achieving sustainable rural development.
