The county commissioners of each county now organized, and of each county to be hereafter organized in this state, shall, at their regular session in January of each year and at such other sessions as they in their discretion may deem proper, hear and consider all applications which may be made to them by any party or parties interested in either furnishing or delivering for compensation, or by any person or persons using or consuming, water for irrigation or other beneficial purpose or purposes from any ditch, canal or conduit, the whole or any part of which shall be in such county, which application shall be supported by such affidavit as the applicant or applicants may present, showing reasonable cause for such board of county commissioners to proceed to fix a maximum rate of compensation for water thereafter delivered from such ditch, canal or conduit within such county: provided, that when any ditch, canal or conduit shall extend into two (2) or more counties, the county commissioners of each of such counties shall fix the maximum rate for water used in that county.