As a mining engineer and gold assayer, Yeomans had developed a keen sense of hydrology and equipment design.
Yeomans assumed management of a large tract of land he later named Nevallan in New South Wales.
Yeomans' Keyline concepts are now part of the curriculum of many sustainable agriculture courses in colleges and universities across the world.
His ideas have also been a key factor in the development of permaculture design.
Yeomans wrote four books: The Keyline Plan,[3] The Challenge of Landscape,[4] Water For Every Farm[5][6] and The City Forest[7].