Kaumera strengthens sandy dikes against drought: field trial launched at Bevermeerdijk

A new field trial is underway at the Bevermeerdijk in Hoog Keppel, where Water Authority Rijn and IJssel is testing the potential of Kaumera to strengthen dikes in times of extreme drought. The multi-year study (2025–2029), supported by Bureau Waardenburg Ecology, Lumbricus and Kaumera Sales & Services B.V., aims to boost grass cover resilience by improving soil quality.

Sandy dikes are particularly vulnerable to heat and dehydration. This trial investigates whether Kaumera can improve water retention and promote deeper root growth in dry conditions. Twelve test plots were set up with varying inputs: low and high doses of Kaumera, compost, and a control with no additions. Soil moisture, root depth and vegetation development are continuously monitored with sensors and a local weather station.

Kaumera is derived from wastewater and has proven benefits as a soil enhancer and biostimulant. It holds moisture, supports plant development, and improves soil structure—key features for climate-resilient infrastructure. If successful, the trial could pave the way for wider use of Kaumera in flood protection and sustainable land management.

This is the first time Kaumera is being applied on a dike in the Netherlands. It marks an important step toward more climate-adaptive, circular solutions in water safety and infrastructure.

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