Graham Calder spoke about permaculture design principles and techniques for sustainable water and food systems. Permaculture is based on observing natural systems and integrating successful practices. It has three ethics: care for the earth, fair share, and care for people. Graham discussed using swales, mulch, and catchment ponds to make water more accessible on farms. He also recommended no-dig gardens, fruit tree guilds, and hugelkultur mounds to create productive, self-sustaining food systems.