Who has done Pioneering work in the field of rainwater harvesting?

Pioneering work in the field of rainwater harvesting has been significantly contributed by individuals like Dr. Rajendra Singh, an Indian environmentalist known as the "Waterman of India." He has implemented successful rainwater harvesting projects in rural areas, transforming water management practices. Additionally, organizations like the Rainwater Harvesting Association have played a crucial role in promoting innovative techniques and raising awareness about sustainable water practices globally.