Dr. Lydia Olaka is a Senior Lecturer at the Technical University of Kenya. Formerly she was based at the University of Nairobi. Her particular areas of interest include tracer hydrology, hydrogeochemistry, mapping groundwater and surface water interactions, groundwater in high temperature systems, age dating, geogenic pollution and health. Applications include assessment of water resources in mining areas, groundwater in fractured volcanic rocks and water rock interaction for carbon sequestration in mafic rocks.