Within thirty days after such petition has been filed with the supervisors of the soil conservation district or districts, they shall hold a public hearing or hearings upon the practicability and feasibility of creating the proposed watershed improvement district. All owners of land within the proposed watershed improvement district and all other interested parties shall have the right to attend such a hearing and be heard. The supervisors may prescribe such rules and regulations governing the conduct of such hearings as they deem to be necessary.
The supervisors shall thereafter determine whether there is need, in the interest of the public health, safety, or welfare, for the organization of the proposed watershed improvement district. They shall record such determination and shall define the boundaries of such watershed improvement district.