When Yoichi Hatta first came to Taiwan, he was assigned to work under Hamano as a water engineer at the colonial administration's office in Tainan.
八田來台初期曾經擔任濱野的部屬，並被派往台南廳擔任自來水工程師。這段期間的歷練，讓八田深入台南地區、曾文溪的環境以及水利工程的實務。