The owner or owners of lands which have not been, are not and cannot be benefited by their inclusion in the sub-district may petition the governing body of the sub-district to have such land detached. The petition shall describe such lands and pray the governing body to hear the causes why such lands should be detached. Within 30 days after the receipt of such petition the governing body shall conduct a hearing, having first notified the petitioners by mail at least ten days in advance and by causing such notice to be published at least once in one or more newspapers having general circulation within the sub-district. Following the hearing the governing body shall determine whether or not such lands or any portion of them should be detached. If it is determined that lands shall be detached this fact shall be entered in the official minutes of the sub-district, and certified copies of such entry recorded with the county clerk of each county in which any portion of such detached lands lie, and with the State Department of Agriculture.