Upon filing such petition with the department said department shall set the same for a public hearing within sixty (60) days, said hearing to determine whether or not other lands should be included within the proposed district, or whether some lands which are included should be excluded, and whether the proposed district, as modified by inclusions and exclusions, will be of benefit generally to all persons or property which rely directly or indirectly upon the use of or right to use the ground water supplies within such proposed district.