Heavy Rains Trigger New Sinkholes in Nakuru West: Geologists Warn of Unstable Ground

Residents of Nakuru West faced renewed anxiety on Wednesday as heavy rains triggered the appearance of fresh sinkholes and fissures across the area. This latest surge in geological instability has exacerbated existing concerns among the community, following a troubling pattern of sinkhole activity that has plagued the region in recent months.

Videos circulating online depict the growing sinkholes, with large craters gradually filling with rainwater while curious onlookers gather around. The images highlight a persistent issue that has led to considerable distress among residents, who are all too familiar with the dangers posed by the region’s unstable ground.

In May, Nakuru West experienced a severe episode of sinkhole activity, caused by prolonged heavy rains. This incident displaced over 500 families in Kaptembwa alone, with sinkholes and fissures destroying homes and large swathes of land. The damage was extensive; numerous houses were rendered uninhabitable due to significant cracks and flooding, and one landlord reported the overnight loss of 16 houses.

Nakuru, located within the Great Rift Valley—a geological feature stretching from the Horn of Africa to Mozambique—is built on some of Africa’s most unstable soils. Geologists attribute this instability to the volcanic activity that shaped the Rift Valley. According to Dr. Clement Lenashuru, a Natural Research Scientist, the area’s instability stems from the volcanic ash and pumice that blanket numerous fault lines beneath the surface.

“The region’s subsurface is composed of loose ash sand that can be easily washed away by water percolation,” Dr. Clement explained to Citizen TV. This characteristic makes the ground particularly susceptible to the formation of sinkholes, especially during heavy rains or inadequate drainage.

Soil Scientist Grace Ruiru adds another dimension to the issue, attributing the formation of fissures and sinkholes to the active movement of tectonic plates in the Rift Valley. Nakuru’s sandy soil, which does not retain water well, exacerbates these geological problems, making the area more vulnerable to sinkhole formation.

The implications for Nakuru’s infrastructure are significant. Geologists have repeatedly warned that the rapid construction of skyscrapers in the area could lead to disaster if the ground fails to support the buildings. The unstable soil might not withstand the weight of large structures in the event of natural disasters such as landslips or earthquakes.

“Such buildings are at risk of sinking, cracking, or sustaining severe damage,” Dr. Clement cautioned. The risk is not a distant possibility but an imminent threat that has been flagged by recent studies. In 2020, research aimed at identifying Nakuru’s major fault lines and assessing vulnerability points revealed potential weak spots in the region. Areas including Shabab, London, Kaptembwa, Kiamunyi, and Ngata in Nakuru West, as well as Gilgil and Suswa, were highlighted as particularly susceptible to geological instability.

The current situation underscores the urgent need for comprehensive planning and risk management strategies. As Nakuru continues to experience heavy rains and increasing sinkhole activity, it is imperative that local authorities and residents take proactive measures to mitigate the risks associated with the unstable ground. Enhanced building regulations, improved drainage systems, and better land-use planning could help reduce the impact of these geological hazards.

In summary, the recent sinkhole developments in Nakuru West are a stark reminder of the region’s ongoing struggle with geological instability. With warnings from experts about the risks posed by both natural and human-induced factors, it is crucial for the community and authorities to address these challenges with effective solutions to safeguard lives and property.