Traditionally, geotechnical design focuses on soil strength and stability. But what about water management? Capillary barriers, innovative layers within soil profiles, are revolutionizing this field. By manipulating water's surface tension, these barriers restrict downward flow, reducing water infiltration into sensitive areas. This opens doors for geotechnical engineers. Imagine slopes stabilized by redirecting rainwater, or landfill caps keeping pollutants contained. Capillary barriers are shaping the future of geotechnical design, promoting sustainable and water-conscious construction.